Boundary Element Analysis of Punch Problem Based on Complementary Theory

A nonlinear complementarity approach is presented to solve elastoplastic problems by boundary element method, in which the equations are formulated by stress equations and complementarity function obtained from plasticity constitutive law. The punch problem is analyzed by the proposal method and FEM. The results show that compared to discretize the region in FEM, the proposed method can achieves satisfactory results only needing less internal points and the computational accuracy is accepted.