Simulation of the bending process of hardening metallic sheets using damage model. Part II: Numerical investigations

In the first part of this paper, the theoretical aspects and the algorithmic developments related to the construction of the PBST (Pure Bending Simulation Tool) were provided. In this second part, this tool is used to simulate the pure bending process. The sensitivity of the bendability prediction to certain mechanical properties and phenomena (such as initial porosity and hardening parameters) is investigated by means of a parametric study. The efficiency and the performance of this tool (in terms of accuracy and computation time) compared to the FE method are shown through various numerical simulations.

Research highlights▶ Extended Gurson model (plastic anisotropy and mixed hardening). ▶ Implementation of this model into a numerical tool after its coupling with the kinematics of the pure bending process. ▶ Numerical validation of the different choices and hypotheses. ▶ Performance of the developed numerical tool compared to the FE method in the case of the simulation of the bending process. ▶ Study of the bendability with a fast numerical tool.