THE INFLUENCE OF PLASTIC-STRAIN-INDUCED ANISOTROPY MODELED AS COMBINED ISOTROPIC-KINEMATIC HARDENING IN THE TENSION-TORSION STRAINING PROBLEM(II) - NUMERICAL VERIFICATIONS WITH EXPERIMENTAL MEASUREMENTS

In order to examine the influence of plastic-strain-induced anisotropy (modeled as combined isotropic-kinematic hardening) on the stress resp onse from the non-proportional straining in the tension-torsion tests, a strain-controlled calculation was performed and compared with exper imental measurements. The back stress was visualized in the deviatoric stress space to determine the importance of the role of the kinematic component for the accurate prediction. The result revealed that a com bination of isotropic and kinematic hardening, including the influence of the spin on the evolution of the back stress, leads to good qualit ative agreement with experimental results. It was also shown that the kinematic component of the proposed hardening model plays significant role to predict the stress responses from the cornered strain path acc urately.