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An energy-preserving Discrete Element Method for elastodynamics

Published online by Cambridge University Press:  13 June 2012

Laurent Monasse
Affiliation:
Université Paris-Est, CERMICS 6 et 8 avenue Blaise Pascal, Cité Descartes – Champs-sur-Marne 77455 Marne-la-Vallée Cedex 2, France. monassel@cermics.enpc.fr CEA DAM DIF, 91297 Arpajon, France; laurent.monasse@cea.fr; christian.mariotti@cea.fr
Christian Mariotti
Affiliation:
CEA DAM DIF, 91297 Arpajon, France; laurent.monasse@cea.fr; christian.mariotti@cea.fr
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Abstract

We develop a Discrete Element Method (DEM) for elastodynamics using polyhedral elements. We show that for a given choice of forces and torques, we recover the equations of linear elastodynamics in small deformations. Furthermore, the torques and forces derive from a potential energy, and thus the global equation is an Hamiltonian dynamics. The use of an explicit symplectic time integration scheme allows us to recover conservation of energy, and thus stability over long time simulations. These theoretical results are illustrated by numerical simulations of test cases involving large displacements.

Type
Research Article
Copyright
© EDP Sciences, SMAI, 2012

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