@article{Belkacemi2020,

title = {Role of displacement cascades in Ni clustering in a ferritic Fe-3.3 at%Ni model alloy: Comparison of heavy and light particle irradiations},

author = {Lisa Thinhinane Belkacemi and Estelle Meslin and Brigitte D\'{e}camps and Jean-Paul Crocombette and Olivier Tissot and Thierry Vandenberghe and Pierre Desgardin and Thierry Sauvage and Claire Berthier},

url = {https://www.sciencedirect.com/science/article/pii/S1359646220304838},

doi = {10.1016/j.scriptamat.2020.07.031},

year  = {2020},

date = {2020-07-24},

urldate = {2020-07-24},

journal = {Scripta Materialia},

volume = {188},

abstract = {The behavior of solute atoms in an undersaturated Fe-3.3 at.%Ni model alloy upon heavy and light particle irradiations was investigated by Atom Probe Tomography. Whereas first irradiations, performed using 27 MeV Fe ions at 400 °C, highlight significant Ni enrichment on point defect clusters, solute-rich features detected after 2.8 MeV H+ ion (400 °C) and 1 MeV electron (320 °C) irradiations are only associated with pre-existent microstructural defects. Nanoindentation tests show no hardening in light particle irradiated samples, strongly suggesting that no dislocation loop formed. These observations put forward the importance of point defect clusters resulting from displacement cascades in Ni clusters’ formation.},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Silva2020,

title = {Nickel platinum (NixPt1−x) nanoalloy monodisperse particles without the core\textendashshell structure by colloidal synthesis},

author = {Cora Moreira Da Silva and Armelle Girard and Maxime Dufond and Fr\'{e}d\'{e}ric Fossard and Amandine Andrieux-Ledier and Vincent Huc and Annick Loiseau},

url = {https://pubs.rsc.org/en/content/articlehtml/2020/na/d0na00450b},

doi = {10.1039/D0NA00450B},

year  = {2020},

date = {2020-07-09},

journal = {Nanoscale Advances},

volume = {2020},

number = {2},

pages = {3882\textendash3889},

abstract = {We report a new and versatile colloidal route towards the synthesis of nanoalloys with controlled size and chemical composition in the solid solution phase (without phase segregation such as core\textendashshell structure or Janus structure) or chemical ordering. The principle of the procedure is based on the correlation between the oxidation\textendashreduction potential of metal cations present in the precursors and the required synthesis temperature to nucleate particles without phase segregation. The procedure is demonstrated via the synthesis of Face Centered Cubic (FCC) NixPt1−x nanoparticles, which was elaborated by the co-reduction of nickel(II) acetylacetonate and platinum(II) acetylacetonate with 1,2-hexadecanediol in benzyl ether, using oleylamine and oleic acid as surfactants. The chemical composition and solid solution FCC structure of the nanoalloy are demonstrated by crosslinking imaging and chemical analysis using transmission electron microscopy and X-ray diffraction techniques. Whatever the chemical composition inspected, a systematic expansion of the lattice parameters is measured in relation to the respective bulk counterpart.},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}

@article{deFrancqueville2020b,

title = {Comparison of the finite strain macroscopic behavior and local damage of a soft matrix highly reinforced by spherical or polyhedral particles},

author = {Foucault de Francqueville and Pierre Gilormini and Julie Diani and Aude Vandenbroucke},

url = {https://hal.archives-ouvertes.fr/hal-02900384/document},

year  = {2020},

date = {2020-07-03},

journal = {European Journal of Mechanics - A/Solids},

volume = {84},

number = {104070},

abstract = {Motivated by the different uniaxial responses of two actual materials filled with either sifted glass beads or sifted glass grits, the influence of the fillers shape on the finite strain behavior of highly filled composites (50%) is examined through micromechanical finite element simulations accounting for matrix/filler debonding with a cohesive-zone model. Three-dimensional matrix cells filled with 64 monosized spherical particles are compared to cells filled with the same number of monosized polyhedra. For this purpose, an original generation process was developed to obtain periodic cells with random dispersions of non-regular polyhedra. Finite element simulations of uniaxial tensile tests on the periodic cells allow studying the influence of the fillers shape on the macroscopic behavior and on the local damage at the matrix/filler interfaces. Actually, the presence of sharp edges and apexes for polyhedral particles seems to have a second order impact compared to the cohesive-zone parameters. The damage fields demonstrate the same trends for both particles shapes. The different behaviors observed on actual composites are rather due to different adhesion properties between fillers and matrix than to the shape of particles.},

keywords = {Cluster},

pubstate = {published},

tppubtype = {article}

}

@article{deFrancqueville2020,

title = {Relationship between local damage and macroscopic response of soft materials highly reinforced by monodispersed particles},

author = {Foucault de Francqueville and Pierre Gilormini and Julie Diani and Aude Vandenbroucke},

url = {https://core.ac.uk/download/pdf/303799719.pdf},

doi = {10.1016/j.mechmat.2020.103408},

year  = {2020},

date = {2020-07-01},

journal = {Mechanics of Materials},

volume = {146},

number = {103408},

pages = {1-9},

abstract = {A rubberlike matrix highly filled with spherical micrometric glass beads is submitted to uniaxial tension tests until break. X-ray tomography imaging performed on the material while submitted to uniaxial tension reveals early debonding at the matrix/filler interfaces at the poles of the particles followed by void coalescence creating damage localization. The latter causes a downturn of the macroscopic stress-strain response. These phenomena are analyzed further with three-dimensional finite element simulations, where 64 spherical beads are distributed randomly in a periodic cell. A simple version of the Tvergaard-Hutchinson cohesive-zone model allows to reproduce all the experimental trends well. The effects of the three parameters involved are analyzed, and three different types of macroscopic behaviors are observed corresponding to three different microstructure damages. The value of the initial stiffness of the interface, limited by numerical convergence, has little effect on how the local damage evolves but has a significant impact on the overall macroscopic stress values. The local damage is strongly dependent on the critical strength and the separation failure displacement, and the adhesion energy may be considered as a resulting parameter of the two previous ones. The interfacial critical strength appears to have a significant impact on the damage initiation, either spread across the structure for low values, or localized for high values. Increasing the interface separation failure displacement delays the possible loss of adhesion to a higher strain and preserves the integrity of the composite material.},

keywords = {Cluster},

pubstate = {published},

tppubtype = {article}

}

@article{Bennai2020,

title = {Contribution to the Modelling of Coupled Heat and Mass Transfers on 3D Real Structure of Heterogeneous Building Materials: Application to Hemp Concrete},

author = {Fares Bennai and Kamilia Abahri and Rafik Belarbi },

doi = {10.1007/s11242-020-01426-9},

year  = {2020},

date = {2020-05-25},

journal = {Transport in Porous Media},

pages = {1573-1634},

abstract = {Bio-based materials, such as hemp concrete, have been widely recommended to reduce carbon emissions and energy consumption of buildings as a means of addressing current environmental problems. These materials may possess very interesting hygrothermal and acoustic performance. Hemp concrete is composed of hemp particles embedded in a binder that forms a very heterogeneous and porous component. The aim of this paper is to examine the influence of hemp concrete heterogeneity on the mechanisms of heat and mass transfer. The originality of this paper is to consider the real 3D structure of hemp concrete for modelling coupled heat and moisture transfers within the material. These 3D microstructures were obtained using 3D X-ray tomography reconstruction with a voxel size of 31.8 µm. Then, a specific finite element mesh was generated from the real, heterogeneous geometry of hemp shives, binder and interparticle air. A mesoscopic model was developed to simulate coupled heat and mass transfer phenomena within the material. The 3D temperature and relative humidity fields showed high heterogeneity and complex distributions that are governed by the hemp concrete morphology. In addition, the anisotropy of the material led to different effective thermal conductivities in each transfer direction. Numerical comparison with simulations performed on the fictive elementary representative volume of hemp concrete showed that consideration of the real geometry allows a better understanding of coupled heat and moisture transfer phenomena modelling.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Vennat2019,

title = {Morphology and mechanics of dentin using FIB-SEM},

author = {Elsa Vennat and Asef Hemmati and Thomas Reiss and Eva H\'{e}ripr\'{e} and U. Muendi and E. Dursun and Nicolas Schmitt},

editor = {Taylor and Francis Ltd.},

url = {https://www.tandfonline.com/doi/full/10.1080/10255842.2020.1713492},

doi = {10.1080/10255842.2020.1713492},

issn = {10255842},

year  = {2020},

date = {2020-05-22},

urldate = {2019-12-03},

booktitle = {Computer Methods in Biomechanics and Biomedical Engineering},

volume = {22},

number = {51},

pages = {S90-S92},

keywords = {Helios},

pubstate = {published},

tppubtype = {article}

}

@article{Cl\'{e}ment2020,

title = {Gold(I)\textendashsilver(I)-calix[8]arene complexes, precursors of bimetallic alloyed Au\textendashAg nanoparticles},

author = {Marie Cl\'{e}ment and Ibrahim Abdellah and Cyril Martini and Fr\'{e}d\'{e}ric Fossard and Diana Dragoe and Hynd Remita and Vincent Huc and Isabelle Lampre},

editor = {Royal Society of Chemistry},

url = {https://pubs.rsc.org/en/content/articlelanding/2020/na/d0na00111b#!divAbstract},

doi = {10.1039/d0na00111b},

year  = {2020},

date = {2020-05-05},

journal = {Nanoscale Advances},

volume = {2},

pages = {2768-2773 },

abstract = {In this paper, we report the first synthesis and characterisations of bimetallic gold(I)\textendashsilver(I) calix[8]arene complexes. We show that the radiolytic reduction of these complexes leads to the formation of small bimetallic nanoparticles with an alloyed structure, as evidenced by XPS, HR-TEM and STEM/HAADF-EDX measurements.},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Chalvin20,

title = {Genetic Control of Glandular Trichome Development},

author = {Camille Chalvin and St\'{e}phanie Drevensek and Michel Dron and Abdel Bendahmane and Adnane Boualem},

doi = {10.1016/j.tplants.2019.12.025},

issn = {13601385},

year  = {2020},

date = {2020-05-01},

urldate = {2020-05-01},

journal = {Trends in Plant Science},

volume = {25},

number = {5},

pages = {477 - 487},

abstract = {Plant glandular trichomes are epidermal secretory structures producing various specialized metabolites. These metabolites are involved in plant adaptation to its environment and many of them have remarkable properties exploited by fragrance, flavor, and pharmaceutical industries. The identification of genes controlling glandular trichome development is of high interest to understand how plants produce specialized metabolites. Our knowledge about this developmental process is still limited, but genes controlling glandular trichome initiation and morphogenesis have recently been identified. In particular, R2R3-MYB and HD-ZIP IV transcription factors appear to play essential roles in glandular trichome initiation in Artemisia annua and tomato. In this review, we focus on the results obtained in these two species and we propose genetic regulation models integrating these data.},

keywords = {Helios},

pubstate = {published},

tppubtype = {article}

}

@article{Beauchesne2020,

title = {Channeling Effect and Tissue Morphology in a Perfusion Bioreactor Imaged by X-Ray Microtomography},

author = {Claire C. Beauchesne and Morgan Chabanon and Benjamin Smaniotto and Beno\^{i}t Ladoux and Beno\^{i}t Goyeau and Bertrand David },

editor = {Springer Verlag},

url = {https://hal.archives-ouvertes.fr/hal-02874660/document},

doi = {10.1007/s13770-020-00246-8},

year  = {2020},

date = {2020-04-20},

journal = {Tissue Engineering and Regenerative Medicine},

volume = {17},

number = {3},

pages = {301-311},

abstract = {Background:

Perfusion bioreactors for tissue engineering hold great promises. Indeed, the perfusion of culture medium enhances species transport and mechanically stimulates the cells, thereby increasing cell proliferation and tissue formation. Nonetheless, their development is still hampered by a lack of understanding of the relationship between mechanical cues and tissue growth.



Methods:

Combining tissue engineering, three-dimensional visualization and numerical simulations, we analyze the morphological evolution of neo-tissue in a model bioreactor with respect to the local flow pattern. NIH-3T3 cells were grown under perfusion for one, two and three weeks on a stack of 2 mm polyacetal beads. The model bioreactor was then imaged by X-ray micro-tomography and local tissue morphology was analyzed. To relate experimental observations and mechanical stimulii, a computational fluid dynamics model of flow around spheres in a canal was developed and solved using the finite element method.



Results:

We observe a preferential tissue formation at the bioreactor periphery, and relate it to a channeling effect leading to regions of higher flow intensity. Additionally, we find that circular crater-like tissue patterns form in narrow channel regions at early culture times. Using computational fluid dynamic simulations, we show that the location and morphology of these patterns match those of shear stress maxima. Finally, the morphology of the tissue is qualitatively described as the tissue grows and reorganizes itself.



Conclusion:

Altogether, our study points out the key role of local flow conditions on the tissue morphology developed on a stack of beads in perfusion bioreactors and provides new insights for effective design of hydrodynamic bioreactors for tissue engineering using bead packings.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Gong2020,

title = {Analytical model of selective external oxidation of Fe-Mn binary alloys during isothermal annealing treatment},

author = {Li Gong and Nathalie Ruscassier and Mehdi A. Ayouz and Paul Haghi-Ashtiani and Marie-Laurence Giorgi},

editor = {Elsevier Ltd},

doi = {10.1016/j.corsci.2020.108454},

issn = {0010938X},

year  = {2020},

date = {2020-04-15},

journal = {Corrosion Science},

volume = {166},

number = {108454},

abstract = {An analytical model was developed to describe the kinetics of external selective oxidation of Fe-Mn alloys during isothermal industrial annealing. This model describes the surface reactions and thermodynamics involving water vapor, the pre-oxidation and diffusion of oxygen and manganese and the heterogeneous nucleation and growth of MnO oxides on the surface. Theoretical equations were established and solved to calculate the critical radius and nucleation rate of MnO embryos, the size and surface coverage fraction of MnO oxides and the manganese concentration profiles as a function of annealing time. The model results were validated by annealing experiments at 800 °C.},

keywords = {Helios, Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Mukherjee2020,

title = {Microstructurally-guided explicit continuum models for isotropic magnetorheological elastomers with iron particles},

author = {Dipayan Mukherjee and Laurence Bodelot and Kostas Danas},

url = {http://www.kostasdanas.com/kdanas_files/ArMBDIJNM2020.pdf},

doi = {10.1016/j.ijnonlinmec.2019.103380},

issn = {00207462},

year  = {2020},

date = {2020-04-01},

journal = {International Journal of Non-Linear Mechanics},

volume = {120},

pages = {103380},

abstract = {This work provides a family of explicit phenomenological models both in the F−H and F−B variable space. These models are derived directly from an analytical implicit homogenization model for isotropic magnetorheological elastomers (MREs), which, in turn, is assessed via full-field numerical simulations. The proposed phenomenological models are constructed so that they recover the same purely mechanical, initial and saturation magnetization and initial magnetostriction response of the analytical homogenization model for all sets of material parameters, such as the particle volume fraction and the material properties of the constituents (e.g., the matrix shear modulus, the magnetic susceptibility and magnetization saturation of the particles). The functional form of the proposed phenomenological models is based on simple energy functions with small number of calibration parameters thus allowing for the description of magnetoelastic solids more generally such as anisotropic (with particle-chains) ones, polymers comprising ferrofluid particles or particle clusters. This, in turn, makes them suitable to probe a large set of experimental or numerical results. The models of the present study show that in isotropic MREs, the entire magnetization response is insensitive to the shear modulus of the matrix material even when the latter ranges between 0.003-0.3MPa, while the magnetostriction response is extremely sensitive to the mechanical properties of the matrix material.},

keywords = {Cluster},

pubstate = {published},

tppubtype = {article}

}

@article{Alves2020,

title = {Effect of bio-functional MAO layers on the electrochemical behaviour of highly porous Ti},

author = {Alexandra C. Alves and A.I. Costa and Fatih Toptan and Jose L. Alves and Isabel B. Leonor and E. Ribeiro and Rui L. Reis and Ana M. P. Pinto and J.C.S. Fernandes},

editor = {Elsevier B.V.},

url = {http://repositorium.sdum.uminho.pt/bitstream/1822/66295/1/2020-%20Effect%20of%20bio-functional%20MAO%20layers%20on%20the%20electrochemical%20behaviour%20of%20highly%20porous%20Ti.pdf},

doi = {10.1016/j.surfcoat.2020.125487},

year  = {2020},

date = {2020-03-25},

urldate = {2020-03-25},

journal = {Surface and Coatings Technology},

volume = {386},

number = {125487},

abstract = {Ti foams are attractive for orthopaedic applications due to reduced Young's modulus and ability of bone in-growth. However, poor corrosion behaviour and lack of bioactivity are yet to be overcome. In the present work, highly porous Ti samples were processed by powder metallurgy with space holder technique and bio-functionalized by micro-arc oxidation, resulting in nano/micro structured TiO2 surfaces containing bioactive elements. The electrochemical behaviour of these bio-functionalized highly porous Ti surfaces was evaluated through potentiodynamic polarization and EIS in physiological solution at body temperature. Results showed that bio-functionalization improved the corrosion behaviour of highly porous Ti. However, increased macro-porosity led to an increased corrosion rate.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Barkia2020,

title = {On the origin of the high tensile strength and ductility of additively manufactured 316L stainless steel: Multiscale investigation},

author = {Bassem Barkia and Pascal Aubry and Paul Haghi-Ashtiani and Thierry Auger and Lionel Gosmain and Fr\'{e}d\'{e}ric Schuster and Hicham Maskrot},

editor = {Chinese Society of Metals},

doi = {10.1016/j.jmst.2019.09.017},

issn = {10050302},

year  = {2020},

date = {2020-03-15},

journal = {Chinese Society of Metals},

volume = {41},

pages = {209-218},

abstract = {We report that 316L austenitic stainless steel fabricated by direct laser deposition (DLD), an additive manufacturing (AM) process, have a higher yield strength than that of conventional 316L while keeping high ductility. More interestingly, no clear anisotropy in tensile properties was observed between the building and the scanning direction of the 3D printed steel. Metallographic examination of the as-built parts shows a heterogeneous solidification cellular microstructure. Transmission electron microscopy observations coupled with Energy Dispersive X-ray Spectrometry (EDS) reveal the presence of chemical micro-segregation correlated with high dislocation density at cell boundaries as well as the in-situ formation of well-dispersed oxides and transition-metal-rich precipitates. The hierarchical heterogeneous microstructure in the AM parts induces excellent strength of the 316L stainless steel while the low staking fault energy of the as-built 316L promotes the occurrence of abundant deformation twinning, in the origin of the high ductility of the AM steel. Without additional post-process treatments, the AM 316L proves that it can be used as a structural material or component for repair in mechanical construction.},

keywords = {Helios, Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Ma2020,

title = {An energy-based strategy for fatigue analysis in presence of general multi-axial time varying loadings},

author = {Zepeng Ma and Patrick Le Tallec and Habibou Maitournam},

doi = {10.1016/j.ijfatigue.2019.105367},

year  = {2020},

date = {2020-03-01},

journal = {International Journal of Fatigue},

volume = {132},

number = {105367},

abstract = {The purpose of this paper is to propose an energy based multi-scale fatigue approach which handles multidimensional time varying loading histories. Our fundamental thought is to assume that the energy dissipated at small scales governs fatigue at failure in a nonlinear additive way. We follow the Dang Van paradigm at macro scale. The structure is elastic at the macroscopic scale. At each material point, there is a stochastic distribution of weak points which will undergo strong plastic yielding, which contribute to energy dissipation without affecting the overall macroscopic stress. A kinematic hardening under the assumption of associative plasticity is also considered. Instead of using the number of cycles, we use the concept of multi-scale damage accumulation during the considered load history. A concise non-linear damage accumulation law is also proposed in our model. Fatigue will then be determined from the plastic shakedown cycle and from a phenomenological fatigue law linking lifetime and accumulated mesoscopic plastic dissipation.},

keywords = {Cluster},

pubstate = {published},

tppubtype = {article}

}

@article{Phulpin2020,

title = {Development of SiC reliability study tool},

author = {Tanguy Phulpin and Alexandre Jaffr\'{e} and Jos\'{e} Alvarez and M. Lazar},

doi = {10.1016/j.ssel.2020.01.002},

year  = {2020},

date = {2020-02-19},

journal = {Solid State Electronics Letters},

volume = {1},

number = {2},

pages = {131-139},

abstract = {Understanding the failure mechanisms is essential to ensure reliability for a new technology of semiconductors. Amongst various existing tools dedicated to silicon-based devices, there is no consensual method for silicon carbide (SiC) devices. This semiconductor offers very interesting properties for power electronics in comparison with Si, but these failures are different and need to be studied. This paper will compare different methods applied to failures, focusing on lock-in thermography and micro-Raman analysis. Three devices will be evaluated, a vertical diode, a lateral diode and a MESFET. A methodology will finally be recommended as a valuable and robust solution for failures mechanisms further studies.},

keywords = {Helios},

pubstate = {published},

tppubtype = {article}

}

@article{Bonneric2019,

title = {Fatigue damage mechanisms in steel cable under bending loading},

author = {Matthieu Bonneric and V\'{e}ronique Aubin and Damien Durville},

doi = {10.1016/j.engfailanal.2019.104184},

year  = {2019},

date = {2019-12-01},

journal = {Engineering Failure Analysis},

volume = {106},

number = {104184},

abstract = {Steel cables can be employed as reinforcements in complex structures. During their use in service, they might be subjected to cyclic loadings leading to fatigue damage. This work deals with the fatigue damage evolution in steel cables used in tires, when subjected to cyclic bending loadings corresponding to some extreme in-service uses of tires. The studied cables are embedded in an elastomer matrix, as required for this application. First, a specific experimental device has been developed to test elastomer-steel cable composite specimens. In order to study damage mechanisms, specimens were observed in a bent position using X-ray tomography after fatigue testing. Crack distribution was analyzed for two distinct loading amplitudes. SEM observations of the crack initiation zones were also made to complete the analysis. Secondly, finite-element analysis was carried out. The bent cable and its matrix were simulated both with and without broken wires, in order to evaluate the impact of the first breakage on the stress distribution within the cable. Eventually, the combination of observations and simulations allowed to propose two damage mechanisms, depending on the loading severity.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Nukala2019,

title = {Direct epitaxial growth of polar (1-x)HfO2-(x)ZrO2 ultra-thin films on Silicon},

author = {Pavan Nukala and Jordi Antoja-Lleonart and Yingfen Wei and Lluis Yedra and Brahim Dkhil and Beatriz Noheda},

url = {https://www.rug.nl/research/portal/files/112402848/acsaelm.9b00585.pdf},

doi = {10.1021/acsaelm.9b00585},

year  = {2019},

date = {2019-11-25},

journal = {ACS Appl. Electron. Mater.},

volume = {1},

pages = {2585-2593},

abstract = {Ultra-thin Hf1-xZrxO2 films have attracted tremendous interest since they show ferroelectric behavior at the nanoscale, where other ferroelectrics fail to stabilize the polar state. Their promise to revolutionize the electronics landscape comes from the well-known Si-compatibility of HfO2 and ZrO2, which (in amorphous form) are already used as gate oxides in MOSFETs. However, the recently discovered crystalline ferroelectric phases of hafnia-based films have been grown on Si only in polycrystalline form. Better ferroelectric properties and improved quality of the interfaces have been achieved in epitaxially-grown films, but these are only obtained on non-Si substrates. Here we report direct epitaxy of polar Hf1-xZrxO2 phases on Si, enabled via in situ scavenging of the native a-SiOx layer, using pulsed laser deposition under ballistic deposition conditions. We investigate the effect of substrate orientation and films composition to provide fundamental insights into the conditions that lead to the preferential stabilization of polar phases, namely the rhombohedral (r-) and the orthorhombic (o-) phases, against the non-polar monoclinic (m-), on Si.},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Thibeaux2019,

title = {Assessment of the interplay between scaffold geometry, induced shear stresses, and cell proliferation within a packed bed perfusion bioreactor},

author = {Roman Thibeaux and Herv\'{e} Duval and Benjamin Smaniotto and Elsa Vennat and David Neron and Bertrand David},

editor = {Wiley},

doi = {10.1002/btpr.2880},

issn = {87567938},

year  = {2019},

date = {2019-11-01},

journal = {Biotechnology Progress},

volume = {35},

number = {e2880},

abstract = {By favoring cell proliferation and differentiation, perfusion bioreactors proved efficient at optimizing cell culture. The aim of this study was to quantify cell proliferation within a perfusion bioreactor and correlate it to the wall shear stress (WSS) distribution by combining 3-D imaging and computational fluid dynamics simulations.NIH-3T3 fibroblasts were cultured onto a scaffold model made of impermeable polyacetal spheres or Polydimethylsiloxane cubes. After 1, 2, and 3 weeks of culture, constructs were analyzed by micro-computed tomography (μCT) and quantification of cell proliferation was assessed. After 3 weeks, the volume of cells was found four times higher in the stacking of spheres than in the stacking of cube.3D-μCT reconstruction of bioreactors was used as input for the numerical simulations. Using a lattice-Boltzmann method, we simulated the fluid flow within the bioreactors. We retrieved the WSS distribution (PDF) on the scaffolds surface at the beginning of cultivation and correlated this distribution to the local presence of cells after 3 weeks of cultivation. We found that the WSS distributions strongly differ between spheres and cubes even if the porosity and the specific wetted area of the stackings were very similar. The PDF is narrower and the mean WSS is lower for cubes (11 mPa) than for spheres (20 mPa). For the stacking of spheres, the relative occupancy of the surface sites by cells is maximal when WSS is greater than 20 mPa. For cubes, the relative occupancy is maximal when the WSS is lower than 10 mPa. The discrepancies between spheres and cubes are attributed to the more numerous sites in stacking of spheres that may induce 3-D (multi-layered) proliferation.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Lopez-Conesa2019,

title = {Cation disorder in Sr0.67Ba0.33Nb2O6 assessed by aberration corrected stem},

author = {L. Lopez-Conesa and J.M. Rebled and A. Ruiz-Caridad and A. Torres-Pardo nad M.L. Ruiz-Gonzalez and J.M. Gonzalez-Calbet and G. Dezanneau and S. Estrade and F. Peiro},

doi = {10.1016/j.rinma.2019.100038},

year  = {2019},

date = {2019-10-23},

journal = {Results in Materials},

volume = {3},

pages = {100038},

abstract = {The microstructure and composition of a single crystal of the relaxor Sr0.67Ba0.33Nb2O6 have been assessed by aberration corrected TEM. Electron diffraction showed the presence of diffuse intensity and superstructure incommensurate reflections, compatible with Sr vacancies and Sr/Ba mixing at specific crystal sites respectively. Atomic resolution high angle annular dark field imaging confirmed the presence of these cation vacancies and electron energy loss spectroscopy demonstrated the random mixing of Ba and Sr. Unveiling structure and chemistry with this unprecedent spatial resolution gives the necessary understanding of the electric charge disorder at the origin of polar nanodomains, ultimately leading to relaxor behaviour.},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Mendoza2019,

title = {Complete mechanical regularization applied to digital image and volume correlation},

author = {Arturo Mendoza and Jan Neggers and Fran\c{c}ois Hild and St\'{e}phane Roux},

editor = {Elsevier B.V.},

url = {https://hal.archives-ouvertes.fr/hal-02148780/file/CMAME2019-ccsd.pdf},

doi = {10.1016/j.cma.2019.06.005},

issn = {00457825},

year  = {2019},

date = {2019-10-01},

journal = {Computer Methods in Applied Mechanics and Engineering},

volume = {355},

pages = {27-43},

abstract = {This paper presents a new regularization scheme for Digital Image Correlation (DIC) and Digital Volume Correlation (DVC) techniques based on the equilibrium gap method with reference to a linear elastic behavior. This scheme constitutes a unique framework for performing the so-called mechanical regularization for any problem dimension. “Complete regularization” refers to the fact that a specific treatment of boundaries (surfaces) is introduced here on the same footing as the bulk, independently of the complexity of their shape. The proposed treatment distinguishes the roles that different boundaries (Neumann or Dirichlet) play in mechanical tests. Numerical cases on synthetic data and a real experimental test validate the robustness and accuracy of the method. The analyzed experiment shows that only the use of (complete) regularization ensures convergence. Even in the cases where such regularization is not employed but convergence is achieved, it is at much higher cost. These results reveal the benefit of regularization on the convergence rate of DVC.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Jailin2019c,

title = {Sub-minute In Situ Fracture Test in a Laboratory CT Scanner},

author = {Cl\'{e}ment Jailin and Amine Bouterf and Raphael Vargas and Fran\c{c}ois Hild and St\'{e}phane Roux},

editor = {Springer},

url = {https://hal.archives-ouvertes.fr/hal-02189645/file/IMMI2019-ccsd.pdf},

doi = {10.1007/s40192-019-00151-6},

issn = {21939764},

year  = {2019},

date = {2019-09-01},

journal = {Integrating Materials and Manufacturing Innovation},

volume = {8},

number = {3},

pages = {413-422},

abstract = {The present study aims at demonstrating the feasibility of performing a fracture test in less than 1 min in a laboratory CT scanner despite the severe time constraints of tomography acquisition. After introducing the basic concepts of projection-based digital volume correlation, the specific implementation of this methodology to a wedge splitting test on a refractory material is presented. The kinematics of the test is described over a mesh tailored to the sample geometry, and the elastic behavior of the sample is exploited through finite element computations to provide sensitivity fields of experimental boundary conditions to allow for their “measurements.” Enhancing the simulation to account for crack advance with extended finite element analyses allows the sensitivity of the procedure to the crack position to be assessed. A confidence interval for the refractory toughness is finally obtained.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Dennstedt2019,

title = {Three-Dimensional Characterization of Cracks in a Columnar Thermal Barrier Coating System for Gas Turbine Applications},

author = {Anne Dennstedt and Fabrice Gaslain and Marion Bartsch and Vincent Guipont and Vincent Maurel},

editor = {Springer},

url = {https://www.researchgate.net/publication/335044598_Three-Dimensional_Characterization_of_Cracks_in_a_Columnar_Thermal_Barrier_Coating_System_for_Gas_Turbine_Applications#fullTextFileContent},

doi = {10.1007/s40192-019-00150-7},

issn = {21939764},

year  = {2019},

date = {2019-09-01},

journal = {Integrating Materials and Manufacturing Innovation},

volume = {8},

number = {3},

pages = {400-412},

abstract = {Thermal barrier coatings (TBC) are multilayered systems comprising a metallic oxidation protection layer or so-called bond coat, a ceramic topcoat, and a thermally grown aluminum oxide developing at the interface. The coating systems fail typically by delamination cracking near this interface, which has a complex three-dimensional morphology influencing the crack path. This study combines laser shock adhesion test to introduce an artificial interfacial crack, known in size and location, and focused ion beam coupled with scanning electron microscopy 3D serial sectioning tomography. Methods for proper segmentation of cracks and adjacent materials and quantitative evaluation of the complex crack system are proposed and applied for analyzing the crack tip region. Finally, derived from the three-dimensional segmentation, a finite element model has been achieved and used for thermal analysis highlighting the crucial role of local damage on thermal conductivity of the TBC.},

keywords = {Helios},

pubstate = {published},

tppubtype = {article}

}

@article{Legendre2019,

title = {A unique combination of in-situ and multi-scale methodologies to analyze damage mechanisms of temper rolled zinc coating},

author = {Jean Legendre and Romain Cr\'{e}ac'hcadec and Alexandre Tanguy and Simon Hallais and Jean-Hubert Schmitt and Eva H\'{e}ripr\'{e} and Frida Gilbert and Denis Jacquet and Jean-Michel Mataigne},

editor = {Elsevier Ltd},

doi = {10.1016/j.msea.2019.138156},

issn = {09215093},

year  = {2019},

date = {2019-08-19},

journal = {Materials Science and Engineering A},

volume = {763},

abstract = {Coated sheets for car body are assembled by spot-welding and, more and more, by adhesive bonding. Thus, during life time, the coating endures stresses which can lead to the failure of the whole bonded assembly. The behavior of the zinc coating has then to be primarily studied during tension of flat samples. Several investigation techniques, including in-situ characterizations and 3D observations, are combined to observe and understand the damage mechanisms of the zinc coating during plastic deformation. A specific attention is paid to the influence of temper rolling which is usually applied on low-carbon steel sheets after annealing and hot-dip coating. Damage is mainly observed at the boundary of large zinc grains lying on the surface plateaus, non-deformed by rolling, and often nucleates at the defects due to dendritic zinc solidification.},

keywords = {Helios},

pubstate = {published},

tppubtype = {article}

}

@article{Abahri2019,

title = {Thermo-structural behavior of soft wood under high X-ray tomography resolution},

author = {Kamilia Abahri and D. Kosiachevskyi and A. Rima and Chady El Hachem and M. Chaouche },

url = {https://journal.augc.asso.fr/index.php/ajce/article/view/987},

doi = {10.26168/icbbm2019.65},

year  = {2019},

date = {2019-06-26},

journal = {Academic Journal of Civil Engineering},

volume = {37},

number = {2},

pages = {453-459},

abstract = {This study consists in better understanding of the influence of the temperature variations on softwood morphological and structural properties. In this context, the X-ray tomography protocol has been used to follow the property variations, a specific tomographic platinum was used to generate thermal flows and to solicit the sample during scans. The study was carried out for temperatures between -5°C and 40°C. The numerical treatments allowed us to investigate the evolution of three microstructural properties of the wood: porosity, specific surface and the pores diameter. In addition, the material exhibits hysteresis behavior along a heating and cooling cycle caused by the anisotropic changes expressed by the swelling / shrinkage of the wooden cell walls. To better quantify these morphological variations, a Digital Image Correlation (DIC) were investigated and the deformation field were calculated function of the wood anatomical structure for both earlywood and latewood. In the tangential direction, the deformation presents a maximum of 1.5 times larger than the radial one. In addition, the deformations caused by heating are larger than those of the cooling cycle. This study provides the literature and future research with promising results especially on the evolution of the wood morphology for better prediction of its macroscopic hygro-thermal behavior.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Tarantino2019,

title = {Random 3D-printed isotropic composites with high volume fraction of pore-like polydisperse inclusions and near-optimal elastic stiffness},

author = {Maria-Gabriella Tarantino and Othmane Zerhouni and Kostas Danas},

editor = {Acta Materialia Inc},

url = {https://hal-polytechnique.archives-ouvertes.fr/hal-02167837/document},

doi = {10.1016/j.actamat.2019.06.02},

issn = {13596454},

year  = {2019},

date = {2019-06-14},

journal = {Acta Materialia},

volume = {175},

pages = {331-340},

abstract = {Highly porous materials with random closed-cell architecture combine isotropy with high stiffness. Yet in practice, the complexity of their manufacturing limits the experimental exploration of these materials, for which studies of the elastic response remain to date mainly theoretical. In this study, we measure experimentally the elastic moduli of random closed-cell porous-like composites fabricated by 3D-printing. These materials contain a high volume fraction (up to 82 vol pct) of non-overlapping, poly-disperse void-like spherical inclusions, which are randomly dispersed in a homogeneous polymer matrix.We first generate the virtual microstructures of these materials using a random sequential adsorption (RSA) algorithm, and then use numerical homogenization to compute the size of the material representative volume element (RVE). The latter is used to assemble the test samples, whereby the void-like inclusions are 3D-printed using a gel-like polymer with mechanical properties that are in high contrast with those of the base polymer thus behaving mechanically as pores. Experiments reveal that the pro-posed isotropic random closed-cell porous materials have bulk and shear moduli that lie very close to the theoretical Hashin-Shtrikman upper bounds for an isotropic porous solid.},

keywords = {Cluster},

pubstate = {published},

tppubtype = {article}

}

@article{Buljac2019,

title = {Digital Volume Correlation: Progress and Challenges},

author = {Ante Buljac and Cl\'{e}ment Jailin and Arturo Mendoza and Jan Neggers and Thibault Taillandier-Thomas and Amine Bouterf and Benjamin Smaniotto and Fran\c{c}ois Hild and St\'{e}phane Roux},

editor = {Springer, Cham},

url = {https://hal.archives-ouvertes.fr/hal-02152272/document},

doi = {10.1007/978-3-030-30009-8_17},

year  = {2019},

date = {2019-06-11},

booktitle = {Annual Conference and Exposition on Experimentaland Applied Mechanics},

journal = {Advancements in Optical Methods \& Digital Image Correlation in Experimental Mechanics},

volume = {3},

pages = {113-115},

abstract = {Digital volume correlation consists in registering series of 3D images of experiments to yield 4D displacement fields. These 4D analyses have been conducted for the last two decades. Some achievements and current challenges are reviewed herein.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Chabanon2019,

title = {Histological Method to Study the Effect of Shear Stress on Cell Proliferation and Tissue Morphology in a Bioreactor},

author = {Morgan Chabanon and Herv\'{e} Duval and J\'{e}r\^{o}me Grenier and Claire Beauchesne and Benoit Goyeau and Bertrand David},

editor = {Korean Tissue Engineering and Regenerative Medicine Society},

url = {https://www.researchgate.net/profile/Morgan_Chabanon/publication/331937441_Histological_Method_to_Study_the_Effect_of_Shear_Stress_on_Cell_Proliferation_and_Tissue_Morphology_in_a_Bioreactor/links/5cace4cd92851ccd4ac055aa/Histological-Method-to-Study-the-Effect-of-Shear-Stress-on-Cell-Proliferation-and-Tissue-Morphology-in-a-Bioreactor.pdf},

doi = {10.1007/s13770-019-00181-3},

issn = {17382696},

year  = {2019},

date = {2019-06-01},

journal = {Tissue Eng Regen Med},

volume = {16},

number = {3},

pages = {225-235},

abstract = {Background:

Tissue engineering represents a promising approach for the production of bone substitutes. The use of perfusion bioreactors for the culture of bone-forming cells on a three-dimensional porous scaffold resolves mass transport limitations and provides mechanical stimuli. Despite the recent and important development of bioreactors for tissue engineering, the underlying mechanisms leading to the production of bone substitutes remain poorly understood.



Methods:

In order to study cell proliferation in a perfusion bioreactor, we propose a simplified experimental set-up using an impermeable scaffold model made of 2 mm diameter glass beads on which mechanosensitive cells, NIH-3T3 fibroblasts are cultured for up to 3 weeks under 10 mL/min culture medium flow. A methodology combining histological procedure, image analysis and analytical calculations allows the description and quantification of cell proliferation and tissue production in relation to the mean wall shear stress within the bioreactor.



Results:

Results show a massive expansion of the cell phase after 3 weeks in bioreactor compared to static control. A scenario of cell proliferation within the three-dimensional bioreactor porosity over the 3 weeks of culture is proposed pointing out the essential role of the contact points between adjacent beads. Calculations indicate that the mean wall shear stress experienced by the cells changes with culture time, from about 50 mPa at the beginning of the experiment to about 100 mPa after 3 weeks.



Conclusion:

We anticipate that our results will help the development and calibration of predictive models, which rely on estimates and morphological description of cell proliferation under shear stress. },

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Xu2019,

title = {Quasi-in-situ sizing of nanoparticles by laser-induced incandescence during the floating chemical vapor deposition synthesis of carbon nanotubes},

author = {Yiguo Xu and Yang Ma and Delong He and Hanlu Zhang and Laurent Zimmer and Anthony Dichiara and Paul Haghi-Ashtiani and Jinbo Bai},

editor = {Springer Verlag},

url = {https://hal.archives-ouvertes.fr/hal-02152057/document},

doi = {10.1007/s00340-019-7201-4},

issn = {09462171},

year  = {2019},

date = {2019-05-06},

journal = {Applied Physics B: Lasers and Optics},

volume = {125},

number = {6},

pages = {93},

abstract = {In this study, laser-induced incandescence (LII) diagnostic technique was applied for iron-based nanoparticle (NP) sizing during the floating chemical vapor deposition (CVD) synthesis of carbon nanotubes (CNTs). Transmission electron microscopy (TEM) was used to characterize the nature and size of NPs. The LII signal was simulated by taking into account the carbon-encapsulated iron NP density, heat capacity, size distribution, etc. A detailed sensitivity and uncertainty of the key parameters on the evaluated particle size for this model has also been estimated. Using the developed approach, the evolution of NPs in the gas phase along the reactor axis was investigated at 650, 750 and 850 °C. It was found that the evaluated sizes from LII signals were in good agreement with the ones obtained by TEM measurements. The NP size is highly dependent on the temperature under the studied conditions but it does not show obvious difference along the reactor axis. This study reveals an important LII application prospect to understand the catalyst particle behaviors for better control over CNT growth during the floating CVD process.},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Fan2019,

title = {Improved Dielectric Properties in Polypropylene/Poly(vinylidene fluoride) Binary Blends Containing Boron Nitride Nanosheets: Toward High-Voltage Current Application},

author = {Benhui Fan and Mingyu Zhou and Chong Zhang and Jinkai Yuan and Delong He and Yu Liu and Paul Haghi-Ashtiani and Jinbo Bai},

editor = {American Chemical Society},

url = {https://hal.archives-ouvertes.fr/hal-02128204/file/Improved.Dielectric.Properties.in.PolypropylenePoly-vinylidene.fluoride.Binary.Blends.Containing.Boron.Nitride.Nanosheets.towards.High.Voltage.Current.Application.pdf},

doi = {10.1021/acs.jpcc.9b02271},

issn = {19327447},

year  = {2019},

date = {2019-04-19},

urldate = {2019-04-19},

journal = {J. Phys. Chem. C},

volume = {123},

number = {18},

pages = {11993-12000},

abstract = {Binary blends of polypropylene (PP) and poly(vinylidene fluoride) (PVDF) are often hard to process by extrusion because of the poor compatibility between the two semicrystalline polymers. Considering the fast crystallization during the stretching at room temperature, PVDF products with low molecular weight were selected in this study and consequently they presented improved compatibility with PP, which favored extruding and stretching the binary blending film (50\textendash50 weight ratio) into micrometric thickness. The obtained binary blending film had a reasonable dielectric constant of over 3.6, a low dielectric loss of 0.54%, and a high breakdown strength of 439 MV/m. Furthermore, boron nitride nanosheets (BNNS) obtained by liquid exfoliation were introduced into PP/PVDF binary blends, and the composite film displayed further reduced dielectric loss of 0.41% and increased breakdown strength of 478 MV/m. In addition, the composite film with BNNS also had high Young’s modulus and tensile strength. The enhanced dielectric and mechanical properties made PP/PVDF (50\textendash50)/BNNS 5% display potential values in the application of film capacitors for high-voltage direct current systems.},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Hachem2019,

title = {Original experimental and numerical approach for prediction of the microscopic hygro-mechanical behavior of spruce wood},

author = {Chady El Hachem and Kamilia Abahri and Rachid Bennacer},

editor = {Elsevier Ltd},

doi = {10.1016/j.conbuildmat.2019.01.107},

issn = {09500618},

year  = {2019},

date = {2019-04-10},

journal = {Construction and Building Materials},

volume = {203},

pages = {258-266},

abstract = {Being a hygroscopic material, wood is subjected to dimensional variation from a hygric state to another. These variations affect strongly its physical properties and consequently its structural functions in the building. The quantification of the swelling during the hygric transfer within the wood elements is still unknown by the researchers. Hence, specimens with representative dimensions have been prepared and conditioned at two different relative humidity conditions. At each humidity state, the specimens have been scanned using X-ray micro-tomography to have access to their real morphology and evaluate their swelling. After that, a global approach has been set in order to model the hygro-mechanical behavior of the material and validate the model based on the experimental results. To do so, the displacement fields of the volume from the dry to wet humidity states have been calculated with Digital Volume Correlation (DVC). Moreover, a microscopic hygro-mechanical model on the real 3D structure of the material has been proposed. The model has been further validated, through an identification approach, in order to minimize the gap between the numerical and the experimental displacements. The results show good convergence of the model to the experiments, and an estimation of the Poisson coefficient and swelling coefficient of the cell walls.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Bodelot2019,

title = {Aggregate-driven reconfigurations of carbon nanotubes in thin networks under strain: in-situ characterization},

author = {Laurence Bodelot and Luka Pavi\'{c} and Simon Hallais and J\'{e}r\^{o}me Charliac and B\'{e}reng\`{e}re Lebental },

url = {https://core.ac.uk/download/pdf/224826181.pdf},

doi = {10.1038/s41598-019-41989-2},

issn = {20452322},

year  = {2019},

date = {2019-04-02},

journal = {Scientific Reports},

volume = {9},

number = {5513},

abstract = {This work focuses on the in-situ characterization of multi-walled carbon nanotube (CNT) motions in thin random networks under strain. Many fine-grain models have been devised to account for CNT motions in carbon nanotube networks (CNN). However, the validation of these models relies on mesoscopic or macroscopic data with very little experimental validation of the physical mechanisms actually arising at the CNT scale. In the present paper, we use in-situ scanning electron microscopy imaging and high-resolution digital image correlation to uncover prominent mechanisms of CNT motions in CNNs under strain. Results show that thin and sparse CNNs feature stronger strain heterogeneities than thicker and denser ones. It is attributed to the complex motions of individual CNTs connected to aggregates within thin and sparse CNNs. While the aggregates exhibit a collective homogeneous deformation, individual CNTs connecting them are observed to fold, unwind or buckle, seemingly to accommodate the motion of these aggregates. In addition, looser aggregates feature internal reconfigurations via cell closing, similar to foam materials. Overall, this suggests that models describing thin and sparse CNN deformation should integrate multiphase behaviour (with various densities of aggregates in addition to individual CNTs), heterogeneity across surface, as well as imperfect substrate adhesion.},

keywords = {Helios},

pubstate = {published},

tppubtype = {article}

}

@article{Meng2019,

title = {Ultrafine versus coarse grained Al 5083 alloys: From low-cycle to very-high-cycle fatigue},

author = {Li Meng and Anchal Goyal and V\'{e}ronique Doquet and Nicolas Ranc and Jean-Philippe Couzini\'{e}},

url = {https://hal.archives-ouvertes.fr/hal-02063493/file/PIMM-IJF-LI-2019.pdf},

doi = {10.1016/j.ijfatigue.2018.12.004},

year  = {2019},

date = {2019-04-01},

journal = {International Journal of Fatigue},

volume = {121},

pages = {84-97},

keywords = {Helios},

pubstate = {published},

tppubtype = {article}

}

@article{Mercier2019,

title = {DC-DC converter with GaN transistor and coupled with monolithic ICT sintered by PECS/SPS},

author = {Adrien Mercier and Fabien Adam and Denis Labrousse and Bertrand Revol and Alexandre Pasko and Fr\'{e}d\'{e}ric Mazaleyrat},

url = {https://hal.archives-ouvertes.fr/hal-02401703/file/DC_DC%20converter%20with%20GaN%20transistor%20and%20coupled%20with%20monolithic%20ICT%20sintered%20by%20PECS_SPS.pdf},

doi = {10.1080/09398368.2019.1585707},

issn = {09398368},

year  = {2019},

date = {2019-03-01},

journal = {EPE Journal},

volume = {29},

number = {4},

pages = {161-171},

abstract = {This paper presents an implementation of the voltage regulator module (VRM) DC-DC converter operating at 2 MHz using three interleaved switching cells whose outputs are magnetically coupled by monolithic intercell transformers (ICT). The innovation comes from the manufacturing of the ICTs. Spinel ferrite is sintered around two copper windings by pulsed electric current sintering (PECS), also called spark plasma sintering (SPS). The manufacturing processes are detailed in this paper, and the ICTs magnetic properties are measured. The high-frequency operation of the converter has been possible thanks to the implementation of GaN components. The power density of the converter is 15 kW/dm3.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Quinsat2019,

title = {Qualification of CT data for areal surface texture analysis},

author = {Yann Quinsat and Jean Baptiste Guyon and Claire Lartigue},

url = {https://hal.archives-ouvertes.fr/hal-01903012/document},

doi = {10.1007/s00170-018-2894-9},

isbn = {1433-3015},

year  = {2019},

date = {2019-02-25},

journal = {The International Journal of Advanced Manufacturing Technology},

volume = {100},

number = {9-12},

pages = {3025-3035},

abstract = {The evolution of current manufacturing processes, such as additive manufacturing processes, enables to produce parts with increasingly complex internal and external geometries, to answer functional requirements. This requires an evolution of the measurement methods to analyze the complete part produced. In this context, the use of computed tomography (CT) is increasing. Considering the problem of surface quality control, and also considering the cost of such a measuring system, it becomes necessary to evaluate the capability of tomography techniques to characterize surface geometry despite an inadequate resolution. To this end, the study proposed in this paper aims at assessing the quality of surface roughness characterization by CT in comparison with classical optical measure means. Special attention is given to thresholding, which is necessary to extract the surface from CT measurements, which are the basis to evaluate roughness parameters. An advanced analysis is also performed to bring out surface typologies that are more appropriate for CT measurements with poor resolution.},

keywords = {Tomographe},

pubstate = {published},

tppubtype = {article}

}

@article{Arora2019,

title = {Switching on superferromagnetism},

author = {Ashima Arora and Lee C. Phillips and Pavan Nukala and Mohamed Ben Hassine and Ahmet A. \"{U}nal and Brahim Dkhil and Llu\'{i}s Balcells and \`{O}scar Iglesias and Agn\`{e}s Barth\'{e}l\'{e}my and Florian Kronast and Manuel Bibes and Sergio Valencia},

url = {https://arxiv.org/pdf/1902.03728.pdf},

doi = {10.1103/PhysRevMaterials.3.024403},

year  = {2019},

date = {2019-02-08},

journal = {Phys. Rev. Materials},

volume = {3},

number = {2},

pages = {024403},

abstract = {Recent results in electric-field control of magnetism have paved the way for the design of alternative magnetic and spintronic devices with enhanced functionalities and low power consumption. Among the diversity of reported magnetoelectric effects, the possibility of switching on and off long-range ferromagnetic ordering close to room temperature stands out. Its binary character opens up the avenue for its implementation in magnetoelectric data storage devices. Here we show the possibility to locally switch on superferromagnetism in a wedge-shaped polycrystalline Fe thin film deposited on top of a ferroelectric and ferroelastic BaTiO3 substrate. A superparamagnetic to superferromagnetic transition is observed for confined regions for which a voltage applied to the ferroelectric substrate induces a sizable strain. We argue that electric-field-induced changes of magnetic anisotropy lead to an increase of the critical temperature separating the two regimes so that superparamagnetic regions develop collective long-range superferromagnetic behavior.},

keywords = {Helios, Titan},

pubstate = {published},

tppubtype = {article}

}

@article{deFrancqueville2018,

title = {Representative volume elements for the simulation of isotropic composites highly filled with monosized spheres},

author = {Foucault de Francqueville and Pierre Gilormini and Julie Diani},

url = {https://sam.ensam.eu/bitstream/handle/10985/14496/PIMM-IJSS-2018-Foucault%20De%20Francqueville.pdf?sequence=4},

doi = {10.1016/j.ijsolstr.2018.09.013},

year  = {2019},

date = {2019-02-01},

journal = {International Journal of Solids and Structures},

volume = {158},

pages = {277-286},

abstract = {A method is proposed for generating reliable representative volume elements (RVEs) that allows reducing the statistical analysis required for the simulation of the mechanical behavior of isotropic composites highly filled with monosized spheres. The method combines (i) an algorithm inspired from molecular dynamics and associated with an analytical equation of state, and (ii) a geometrical analysis using the two-point correlation function and a nearest-neighbor distribution function. A restrictive selection process is defined, which leads to microstructures reasonably close to randomness and isotropy. The pertinence of the proposed generation and selection of RVEs is confirmed by the simulation of their elastic behavior with the finite element method. In particular, it is shown how the selection procedure allows reducing the computational effort required to reach reliable elastic moduli by operating on a limited number of suitable RVEs. The results are in good agreement with the generalized self-consistent model and with original experimental data obtained on a composite where an acrylate matrix was reinforced by sifted glass beads.},

keywords = {Cluster},

pubstate = {published},

tppubtype = {article}

}

@article{Forel2019,

title = {Tuning bimetallic catalysts for a selective growth of SWCNTs},

author = {Salom\'{e} Forel and Alice Castan and Hakim Amara and Ileana Florea and Fr\'{e}d\'{e}ric Fossard and Laure Catala and Christophe Bichara and Talal Mallah and Vincent Huc and Annick Loiseau and Costel-Sorin Cojocaru},

url = {https://arxiv.org/pdf/1812.06118.pdf},

doi = {10.1039/c8nr09589b},

year  = {2019},

date = {2019-01-29},

journal = {Nanoscale},

volume = {11},

pages = {4091-4100},

abstract = {Recent advances in structural control during the synthesis of SWCNTs have in common the use of bimetallic nanoparticles as catalysts, despite the fact that their exact role is not fully understood. We therefore analyze the effect of the catalyst’s chemical composition on the structure of the resulting SWCNTs by comparing three bimetallic catalysts (FeRu, CoRu and NiRu). A specific synthesis protocol is designed to impede the catalyst nanoparticle coalescence mechanisms and stabilize their diameter distributions throughout the growth. Owing to the ruthenium component which has a limited carbon solubility, tubes grow in tangential mode and their diameter is close to that of their seeding nanoparticles. By using the as-synthesized SWCNTs as a channel material infield effect transistors, we show how the chemical composition of the catalysts and temperature can be used as parameters to tune the diameter distribution and semiconducting-to-metallic ratio of SWCNT samples. Finally, a phenomenological model, based on the dependence of the carbon solubility as a function of catalyst nanoparticle size and nature of the alloying elements, is proposed to interpret the results.},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Zerhouni2019b,

title = {Numerically-aided 3D printed random isotropic porous materials approaching the Hashin-Shtrikman bounds},

author = {Othmane Zerhouni and Maria-Gabriella Tarantino and Kostas Danas},

url = {https://hal-polytechnique.archives-ouvertes.fr/hal-01875669/document},

doi = {10.1016/j.compositesb.2018.08.032},

year  = {2019},

date = {2019-01-01},

journal = {Composites Part B: Engineering},

volume = {156},

pages = {344-354},

abstract = {The present study introduces a methodology that allows to combine 3D printing, experimental testing, numerical and analytical modeling to create random closed-cell porous materials with statistically controlled and isotropic overall elastic properties that are extremely close to the relevant Hashin-Shtrikman bounds. In this first study, we focus our experimental and 3D printing efforts to isotropic random microstructures consisting of single-sized (i.e. monodisperse) spherical voids embedded in a homogeneous solid matrix. The 3D printed specimens are realized by use of the random sequential adsorption method. A detailed FE numerical study allows to define a cubic representative volume element (RVE) by combined periodic and kinematically uniform (i.e. average strain or affine) boundary conditions. The resulting cubic RVE is subsequently assembled to form a standard dog-bone uniaxial tension specimen, which is 3D printed by use of a photopolymeric resin material. The specimens are then tested at relatively small strains by a proper multi-step relaxation procedure to obtain the effective elastic properties of the porous specimens.},

keywords = {Cluster},

pubstate = {published},

tppubtype = {article}

}

@article{Liu2018d,

title = {Constructing 3D CNTs-SiO2@RGO structures by using GO sheets as template},

author = {Yu Liu and Yiguo Xu and Benhui Fan and Minhao Yang and Ann-Lenaig Hamon and Paul Haghi-Ashtiani and Delong He and Jinbo Bai},

url = {https://www.researchgate.net/publication/328307720_Constructing_3D_CNTs-SiO2RGO_structures_by_using_GO_sheets_as_template},

doi = {10.1016/j.cplett.2018.10.047},

isbn = {00092614},

year  = {2018},

date = {2018-12-01},

journal = {Chemical Physics Letters},

volume = {713},

pages = {189-193},

abstract = {A three-dimensional carbon nanotube-silica coated reduced graphene oxide hybrid (CNT-SiO2@RGO) was synthesized by floating-catalyst chemical vapor deposition (CVD), in which ferrocene was used as catalyst precursor and acetylene as carbon source. Graphene oxide (GO) was selected as the template and was pre-treated by tetraethyl orthosilicate (TEOS) to deposit a SiO2 layer on both sides of the platelet surface. The obtained hybrid has a uniform structure consisting of a platelet sandwiched by vertically aligned CNTs. The CNT length can be well controlled by the variation of growth time.},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}

@article{Belkacemi2018,

title = {Radiation-induced bcc-fcc phase transformation in a Fe\textendash3%Ni alloy},

author = {L.T. Belkacemi and Estelle Meslin and Brigitte D\'{e}camps and Bertrand Radiguet and Jean Henry},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053475164\&doi=10.1016%2fj.actamat.2018.08.031\&partnerID=40\&md5=7d6e0478af89ab538030be935c7afe9c},

doi = {10.1016/j.actamat.2018.08.031},

year  = {2018},

date = {2018-12-01},

journal = {Acta Materialia},

volume = {161},

pages = {61-72},

keywords = {Titan},

pubstate = {published},

tppubtype = {article}

}