Technology Research, Based On The Minimum Work Principle Of The Forming Process Simulation

Based on ideal forming theory, for rigid-plastic material, using one-step simulation algorithm, a new finite element approach is introduced for the direct prediction of blank shapes for desired final shapes in sheet metal forming. Bending effects and the effects of normal anisotropy material are considered, but the influences of deformed history are neglected. According to the deformation theory of plasticity of metal plasticity deforming and the ideal forming theory that global plastic work is minimum, the equations of finite element, which are fitted one-step simulation algorithm, are concluded.In this paper, the equation of qualification is afforded; the displacements of triangular shell element are concluded; the normal anisotropy constitution equation of rigid-plastic material is concluded; according to the minimum work path, the equation of finite element are concluded, using Newton-Raphson method to solve the equation.In order to have good portability and good reuseability, object-oriented FEM program in C++ is developed.