The deduction of the calculation formulas for rigid-viscoplastic FEM based on penalty-function method and previous constitutive model;

The key technologies of 3D coupled rigid-viscoplastic thermo-mechanical FEM simulation of blade forging process were studied systematically.

3D rigid-viscoplastic FEM of weakly compressible materials is employed to analyze the deformation behavior during twist-compression forming of cylideric elements.

In this paper,as the coupled thermo mechanical effects between the temperature and mechanical properties being taken into account,3D thermo rigid viscoplastic FEM of compressible materials is employed to coupled analyze the deformation behavior during metal twist compression forming of cylinder at high temperature.

In order to establish accurate constitutive equations for hot deformation of rigid viscoplastic materials, a large number of compress tests have been done on mechanical testing machine (Instron) using L 2 Aluminum as testing material.

On the basis of the rigid viscoplastic FEM theory,a surface defect prediction method for the plastic forming process by FEM numerical simulation has been thoroughly studied.

The structure and key technologies of the 3D rigid plastic/rigid-viscoplactic FEM system developed by authors and named 3D - PFS have been introduced briefly.