Mechanical characterisation of a viscoplastic material sensitive to hydrostatic pressure |
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| Authors: | Michel Gratton Camille Gontier Saïd Rja Fi Allah Abdelhake Bouchou Didier Picart |
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| Affiliation: | 1. Ecole Nationale d''Ingénieurs du Val de Loire, Laboratoire de Mécanique et Rhéologie, Blois, France;2. C.E.A. Le Ripault, Monts, France;1. GeoRessources, UMR 7359 ENSG–Université de Lorraine, 54518 Vand?uvre-lès-Nancy, France;2. IMSIA, UMR EDF-CNRS-CEA-ENSTA 9219, Clamart, France;1. LML, UMR CNRS 8107, University of Lille, 59655 Villeneuve d’Ascq, France;2. IJLRA, UMR CNRS 7190, University of PMC, 75005 Paris, France;3. Laboratory Navier, UMR CNRS 8205, ENPC, 77455 Marne-la-Vallee, France;1. Laboratoire de Mécanique et de Physique des Matériaux (UMR CNRS 6617), Ecole Nationale Supérieure de Mécanique et d’Aérotechnique, F-86961 Futuroscope Cedex, France;2. Laboratoire de Mécanique et Rhéologie (E.A. 2640), ENI Val de Loire, Université François Rabelais de Tours, F-41034 Blois Cedex, France;3. CEA, DAM, Le Ripault, F-37260 Monts, France;1. INSA Centre Val de Loire, Universite François Rabelais de Tours, Laboratoire de Mecanique et Rheologie, EA 2640, BP 3410, F-41034 Blois cedex, France;2. CEA DAM Le Ripault, F-37260 Monts, France;3. Institut Pprime UPR 3346 CNRS – ENSMA – Université de Poitiers, Département physique et Mécanique des matériaux, 1 Avenue Clément Ader, BP 40109, 86961 Futuroscope Chasseneuil cedex, France;1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500, China;2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, China;3. Department of Civil and Environmental Engineering, National University of Singapore, Singapore, 117576;4. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China |
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| Abstract: | The present paper deals with the characterisation of the static mechanical behaviour of an energetic material all along its lifespan. The material behaviour is viscoplastic, damageable and sensitive to hydrostatic pressure. For such materials, existing models have generally been developed in the framework of transient dynamic behaviour. These models are not suitable for a static study. Therefore a specific experimental protocol and an associated model are developed. Characterisation is derived from both uniaxial compressive, tensile tests and triaxial tests. Plastic behaviour is described by means of a parabolic yield criterion and a new hardening law. Non-associated plastic flow rule and isotropic damage complete the model. The performance of the model is illustrated through the simulation of various loading paths. |
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