Experimental and numerical study on the crash behavior of dual-phase steel thin-walled structure subject to axial loading condition by considering forming history
Niu Jianhui，Zhu Ping
School of Mechanical Engineering, Shanghai Key Lab of Digital Autobody Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract：Sheet metal forming process leads to the changes in local thickness and material mechanical properties, which will further affect the final physical properties of thin-walled structures. In this study, drop-weight impacting tests were performed for the top-hat thin-wall structures made of a dual-phase steel, DP590, to investigate the effect of stamping condition on the axial crash behavior. It is found that the deformation of stamped components shows an instable mixed progressive-Euler buckling mode during the impacting process. Moreover, as the increase of blank holder force, the instability phenomena for the corresponding stamped specimen is aggravated. Numerical simulations were also carried out to reproduce the tested forming-crash process. With the introduction of stamping results, the simulated collapse mode of top-hat structures can be closer to the observed physical tests. To ensure the reliability of introduced stamping results, a 7-parameter shell element with thickness stretch should be adopted in the sheet metal forming process.
牛建辉;朱平. 考虑成形历史的双相钢薄壁结构轴向冲击试验与仿真研究[J]. , 2012, 31(23): 44-49.
Niu Jianhui;Zhu Ping. Experimental and numerical study on the crash behavior of dual-phase steel thin-walled structure subject to axial loading condition by considering forming history. , 2012, 31(23): 44-49.
2012, Vol. 31 
