Experimental validation of numerical model for asymmetric deep drawing of DP780 steel sheet using digital image correlation

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

Xue, X.^1 ; Liao, J.^1 ; Vincze, G.^1 ; Pereira, A.B.^1

Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, Aveiro

3810-193, Portugal^1

关键词: Advanced high strength steel;    Anisotropic hardening models;    Deformation analysis;    Deformation behaviour;    Digital image correlation technique;    Digital image correlations;    Experimental validations;    Strain distributions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/734/3/032102/pdf
DOI  :  10.1088/1742-6596/734/3/032102

来源: IOP

【 摘 要 】

A validated numerical model for in-plane stress/strain prediction is essential in understanding the deformation behaviour of sheet metal forming process, in particular, asymmetric deep drawing of advanced high strength steel sheet. In this work, the Yld2000-2d anisotropic yield criterion integrated with the initial homogeneous anisotropic hardening model was employed to describe the complex material behaviours of DP780 steel as well as the adoption of Yoshida chord model for elastic modulus degradation. Digital image correlation technique was utilized to measure the in-plane strain and shape deviation of the developed P- channel. The validity of the numerical model was assessed by comparing the predicted strain distribution and twist springback with the measured results. It indicates that the developed numerical model based on the selected constitutive models is acceptable for the deformation analysis, although the predicted discrepancies still exist.