Transactions of Materials and Heat Treatment

Title：An improved damage fracture criterion and its application in sheet metal forming

Authors： Zeng Rong Huang Liang Li Jianjun Hong Xiudong

Unit： Huazhong University of Science and Technology

KeyWords： material damage-fracture sheet metal forming aluminum alloy finite element method

ClassificationCode：TG304

year,vol(issue):pagenumber：2015,40(8):13-19

Abstract：

The linear damage under uniaxial stress state in the Lemaitre damage fracture criterion was amended as the nonlinear damage under multi-axis stress states, and the cylindrical stamping experiment of aluminum alloy 5052-O was set as an example. The distribution regularity of the equivalent stress, the equivalent plastic strain and the damage per volume were revealed. The relative errors of the forming depth and the wall thickness in simulations and experiments were analyzed, which were used to evaluate applicability of the modified Lemaitre damage fracture criterion in the sheet metal forming process. The results show that the maximum values of the equivalent stress and the equivalent plastic strain appear at the contact area of the circular plate and the punch when the modified Lemaitre damage fracture criterion is used in the simulations of cylindrical stamping process. Furthermore, stamping parts occur fracture at where the damage value per volume reaches 1. The relative error of the forming depth and the maximum relative error of the wall thickness predicted by the modified Lemaitre damage fracture criterion are only 6.5% and 9.2%, respectively.

Funds：

国家自然科学基金资助项目（51105042）；中央高校基本科研业务费资助项目（2012QN040）

曾嵘（1992-），男，博士研究生黄亮（1981-），男，博士，副教授

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