Elasto-plasticite en grandes deformations par la methode des elements finis et de frontiere en 3D

This thesis represents a mixed computational formulation of Finite Element, Finite Difference and Boundary Element Methods for solving problems of finite strain elastoplasticity in 3D.; For geometrical nonlinearity the Total Lagrangian Formulation and for material nonlinearity the Multiplicative Formulation have been selected. The variational formulation which leads to multidimensional singular integrals has been discretisied.; The final nonlinear system of equations has been solved by the Newton-Raphson method. The system is programmed in Fortran. The results are visualized by the Matlab software and compared to analytical solutions and Finite Element methods.