Micromechanical Modeling of Material Forming for the Prediction of Anisotropic Hardening

Funding: Mercator Research Center Ruhr (MERCUR)
Project: Pr-2015-0049
Contact: Dr.-Ing. Till Clausmeyer
Status: Completed

Properties such as texture and hardness of the single phases determine the forming behavior of modern multiphase steels.

Modeling methods that consider the microstructure explicitly predict mechanical properties locally. Prof. Hartmaier and his team at Interdisciplinary Centre for Advanced Materials Simulation (ICAMS) developed a non-local crystal-plasticity model for this purpose (see figure a). The partners at the Institute of Mechanics at University of Duisburg-Essen provide a novel beam element formulation for the simulation of bending processes with representative volume elements (RVE). The formulation relies on the Euler-Bernoulli hypothesis. The material behavior was described using test data from experiments with high strain such as the in-plane torsion test at IUL. The springback and the local plastic strain were predicted with this method for bending parts manufactured from dual
phase steel DP 600.

 

a) Microstructural model (provided by ICAMS), b) Air bending, c) Macroscopic strain (17,5 %)