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(73) Production(s) de l'année 2019
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Effect of collagen network orientation on the cervical intervertebral disc response to flexion load 
Auteur(s): Chetoui M. A., Ambard D., Royer P., Le Floc'h S.
Conference: Congrès de la Société de Biomécanique (Poitiers, FR, 2019-10-28)
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Adhesion-force micro-scale study of desiccating granular material
Auteur(s): Hueckel T., Mielniczuk Boleslaw, El Youssoufi M. S.
(Article) Publié:
Géotechnique, vol. p.1-12 (2019)
Ref HAL: hal-02315208_v1
DOI: 10.1680/jgeot.18.P.298
Exporter : BibTex | endNote
Résumé: Experiments on five-, four-, three-and two-wet-hydrophilic-grain clusters were performed to investigate evolution of adhesion of granular media during drying on the micro-scale. The experiments show that the adhesion-force of a cluster initially grows at most to three times the original value before decreasing to zero by the end of evaporation. The adhesion-force is composed of capillary pressure force acting over the liquid/solid contact surface area, and surface tension forces acting over the three-phase contact perimeter length. This is in contrast with most macro-scale phenomenological models, in which the only desaturation process variables affecting strength are suction and saturation. Both the contact surface area and contact perimeter length are reduced to zero upon complete liquid evaporation. The morphology of an evaporating water body evolves through slow flow controlled by evaporation rate, interrupted by various modes of fast air entry, which are non-equilibrium jumps of liquid/gas interfaces (Haines jumps). The instabilities involve large adhesion force discontinuities and substantial water mass reconfiguration with water flow in an extremely short time, which makes the process transient. The reconfigurations can reduce the original multi-grain water clusters to four-, three-and two-grain clusters by way of three different instability modes: of thin-sheet instability, or meniscus snap-through instability, depending on the sign of the Gauss curvature of the liquid surface, or finally, for two-grain bridges only, a liquid wire pinch-off. For larger meso-scale assemblies, however, the global adhesion-force evolution is little affected by the jumps. The air entries are potential sites for drying cracks. The (approximately) calculated capillary pressure for two-and three-grain clusters, in no cases is seen to reach high values, predicted from water retention curves.
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Assessment of mesenchymental stem cell micropellet as a relevant biomechanical in vitro model devoted to the study of cartilage growth
Auteur(s): Dusfour G., Marie Maumus, Cañadas P., Ambard D., Jorgensen Christian, Noël Danièle, Le Floc'h S.
Conference: 44ème Congrès de la Société de Biomécanique (Poitiers, FR, 2019-10-28)
Actes de conférence: , vol. p. ()
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Asymptotic analysis of a thin linearly elastic plate equipped with a periodic distribution of stiffeners
Auteur(s): Licht C., Weller T.
(Article) Publié:
Comptes Rendus Mécanique, vol. 347 p.555-560 (2019)
Ref HAL: hal-02315121_v1
DOI: 10.1016/j.crme.2019.07.001
Exporter : BibTex | endNote
Résumé: We derive several models of thin plates equipped with a periodic distribution of stiffeners. Depending on the orders of magnitude of the different parameters involved, diverse situations arise, from classical Kirchhoff-Love behaviour with additional energy term to full rigidification.
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Impact des caractéristiques de l’arbre sur les procédés de transformation et les produits en bois
Auteur(s): Thibaut B.
Conférence invité: Parlons qualité des bois (Libramont, BE, 2019-05-09)
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Les techniques de mise en œuvre du bois dans les charpentes de cathédrales : pertinence et innovations
Auteur(s): Thibaut B.
Conférence invité: Office public d'évaluation des choix scientifiques et technologiques- Sénat & Assemblée nationale: QUELS APPORTS DES SCIENCES ET TECHNOLOGIES À LA RESTAURATION DE NOTRE-DAME DE PARIS ? (Paris, FR, 2019-05-23)
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The Contact Dynamics (CD) Method, as a Discrete Element Method for the simulation of granular asteroids
Auteur(s): Sanchez Paul, Renouf M., Azema E., Mozul R.
Conference: European Planetary Science Congress (EPSC-DPS Joint meeting) (Genève, CH, 2019-09-15)
Actes de conférence: EPSC Abstracts, vol. p. ()
Ref HAL: hal-02314928_v1
Exporter : BibTex | endNote
Résumé: Discrete Element Method aim to model the collective behavior of a media composed of distinct interacting particles, and constitute a significant support to experimentation in the sense that they give us access to informations that are difficult to obtain experimentally. Discrete element methods can be classified into two main families: 1) Non Smooth approaches based on non-regular mechanics that take into account shocks without grain interpenetration; and 2) Smooth approaches allowing grains interpenetration. Here, we aim to introduce the Non-smooth Contact Dynamics method, its implementation in LMGC90, as a class of Non Smooth approach, to the Planetary Sciences community. We apply the CD method to model the accretion of spherical and polyhedral particles, and we discuss on the numerical efficiency of the CD method for modeling granular asteroids.
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