Static and impact-dynamic characterization and modeling of multiphase TRIP steels

Abstract
In this paper some highlights are presented of an integrated numerical and experimental approach to obtain an in-depth understanding of the high strain rate behavior of materials. The approach is applied to TRansformation Induced Plasticity (TRIP) steels. Phenomenological and microstructurally-based models to describe the established strain rate and temperature dependent behavior are assessed. ‘Classic’ high strain rate tensile experiments using a split Hopkinson tensile bar setup are complemented with strain rate jump tests and tensile tests at elevated temperatures. High strain rate compression and three-point bending experiments are performed as well. These experiments provide additional validation data for the material models. Around room temperature the use of the Johnson-Cook model is most obvious. However, if a wider temperature range has to be covered, only the microstructurally based models give satisfying results. Advanced experimental setups using the Hopkinson principle provide excellent tools for characterizing the material and structural properties of TRIP steels.