In this paper, we present a theoretical and numerical analysis of frictional contact problems for large deformation elastoplastic based on the finite element method (FEM) and the mathematical program-ming. The study is done on an elastoplastic material obeying to the von Mises criterion. The Coulomb's friction contact is used to implement the frictional boundary conditions and is formulated by the bipotential method, which leads to only one principle of minimum in displacement.
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