Metal sheet deformation predicting method in stamping industry, involves calculating total stress for obtained strain increment by Mroz's hardening rule according to preset yield surface equation

摘要

Strain increment DELTA EPSILON ' for initial loading, unloading and reloading without break and for reloading with possible break in yield surface of sheet metal are obtained. Total stress for strain increment are computed by Morz's hardening rule relative to preset yield surface equation. Radial return method is applied to yield surface equation and using Newton's iteration method, yield surface equation is solved.