STRESS-STRAIN RELATIONSHIP SIMULATION METHOD, SPRING BACK PREDICTION METHOD, AND SPRING BACK ANALYZING DEVICE.

摘要

This method acquires an experimental value for a stress-strain relationship by plastically deforming an elastic-plastic material by displacing or applying a load on same. A calculator: identifies, by using the acquired experimental value, a material parameter contained in an elastic-plastic constitutive model as a prescribed first formula expressing a kinematic hardening incremental vector (daij) for a yield surface in the elastic-plastic constitutive model that is defined as the function for stress and back stress; identifies a material parameter contained in a prescribed second formula on the basis of the prescribed first formula into which the identified material parameter is substituted and the acquired experimental value; and simulates the stress-strain relationship of the elastic-plastic material by using the prescribed first formula and the prescribed second formula, into which the identified material parameters are substituted, and the elastic-plastic constitutive model.