| Using combined type isotropic and kinematic hardening with a Jaumann type derivative, a modified version of the conventional Jaumann derivative which reflects the physical basis for the anisotropy, the rotational Bauschinger effect which occurs during certain loading processes of ductile materials has been modeled.;By solving three cases of shearing deformation; prescribed surface displacement, prescribed traction and a mixed condition which arises in torsion tests, the rotational Bauschinger effect for different ratios of kinematic hardening to isotropic hardening has been analyzed and the interpretation of experiments to obtain material characteristics of the rotational effect has been considered.;In order to extend the finite element code developed by Professor R. L. Mallett to incorporate isotropic-kinematic combined type hardening with the modified Jaumann derivative, the variational principle for the updated Lagrangian formulation and the mid-step method have been modified for application in the presence of strain-induced anisotropy. |
