Mechanical behaviour of TWIP steel under shear loading

10th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes

Vincze, G.^1 ; Butuc, M.C.^1 ; Barlat, F.^1,2

Centre for Mechanical Technology and Automation, University of Aveiro, Campus Universitário de Santiago, Aveiro

3810-193, Portugal^1

Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, San 31 Hyoja-dong, Nam-gu, Gyeongbuk, Pohang

790-784, Korea, Republic of^2

关键词: Anisotropic hardenings;    Bauschinger effects;    Dislocation structures;    Hardening capability;    Industry applications;    Large energy absorption;    Mechanical behaviour;    Twinning induced plasticity steels;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/734/3/032111/pdf
DOI  :  10.1088/1742-6596/734/3/032111

来源: IOP

【 摘 要 】

Twinning induced plasticity steels (TWIP) are very good candidate for automotive industry applications because they potentially offer large energy absorption before failure due to their exceptional strain hardening capability and high strength. However, their behaviour is drastically influenced by the loading conditions. In this work, the mechanical behaviour of a TWIP steel sheet sample was investigated at room temperature under monotonic and reverse simple shear loading. It was shown that all the expected features of load reversal such as Bauschinger effect, transient strain hardening with high rate and permanent softening, depend on the prestrain level. This is in agreement with the fact that these effects, which occur during reloading, are related to the rearrangement of the dislocation structure induced during the predeformation. The homogeneous anisotropic hardening (HAH) approach proposed by Barlat et al. (2011) [1] was successfully employed to predict the experimental results.