Material Model Identification for DC04 Based on the Numerical Modelling of the Polycrystalline Microstructure and Experimental Data

Abstract

Sheet-bulk-metal forming processes require an accurate material model which is derived in this contribution. The microscopic model is based on a simulation of a real microstructure. A validation on the macroscopical scale is performed through the reproduction of the experimentally calculated yield surface based on the homogenised structural response of a corresponding deformed representative volume element (RVE). The microstructural material model is also compared with a macroscopical phenomenological model based on logarithmic strains. The homogenised microscopic model and the phenomenological macroscopic model are in good agreement with the evolution of the stresses and strains obtained during the experiments.

Comparison of Different Biaxial Tests for the Inverse Identification of Sheet Steel Material Parameters

“…Furthermore, because of the cold rolling process, the material behaviour is dependent on the angle of the specimen to the rolling direction of the sheet. A detailed characterisation of the initial yield surface, utilising uniaxial and biaxial compression and tension and shear tests, is shown in and . The amount of initial plastic anisotropy can be numeralised, for example, by the 7% difference of the initial yield strength in and perpendicular to the rolling direction of the sheet.…”