Plastic Deformation Behavior of High Strength Steel Sheet Under Non-Proportional Loading and Its Modeling

Abstract

This paper deals with plastic deformations of a high tensile strength steel sheet (HTSS sheet) under biaxial stress condition including strain path. Using a cruciform specimen of a HTSS sheet of 780MPa-TS, experiments under proportional and non-proportional loadings were investigated. Numerical simulations of stress-strain responses for several strain paths after biaxial stretching were conducted using a large-strain cyclic plasticity model (Yoshida-Uemori model). The results of numerical simulation agrees well the corresponding experimental results, which is attributed to the accurate modeling of the backstress evolution of the anisotropic yield function.

Modeling of Bauschinger Effect During Stress Reversal

“…It is found the experimental data of cross effect show very complicated stress–strain responses . While the stress–strain responses in both 45° and 90° direction with 5% plastic pre‐strain do not show the yield plateau after re‐yielding, the stress–strain responses in the two directions with 10% plastic pre‐strain shows the yield plateau after stress‐reversal.…”

Springback of Aluminum Alloy Sheet Metal and its Modeling

“…An appropriate choice of the combination of constitutive model is of vital important for an accurate sheet-metal stamping simulation [1][2][3] For that purpose, "Yoshida-Uemori model" has been proposed and its high capability in simulating cyclic behavior. The model has been already verified by comparing the numerical simulations with several evidences [4][5][6][7]. However, it was found that the verification of this model, especially the details of the non-proportional deformation behaviors, is not guaranteed for low yield point materials.…”