Constitutive equations of bauschinger effect under stress path changes

It Is widely known that the modelling of Bauschinger effect is one of key points to conduct the accurate sheet metal stamping. The elasto- plasticity behaviour of aluminium alloy steel sheet was investigated by conducting uniaxial compression tension tests in the different angle from the prestraining test. In order to evaluate the accuracy of constitutive models for describing the above mentioned complex elasto- plasticity behaviour, numerical calculations of stress-strain responses were conducted for the corresponding stress paths of the experimental data by using three kinds of constitutive models: the isotropic hardening model (hereafter IH model), Yoshida-Uemori model and the modified Yoshida-Uemori kinematic hardening model. The author's present constitutive model was verified by comparing the stress strain responses with the above mentioned stress-strain histories.