Transactions of Materials and Heat Treatment

Title：Three calibration methods for ductile fracture criterion parameters

Authors： Meng Yehui Zhuang Xincun Zhao Zhen

Unit： Shanghai Jiao Tong University

KeyWords： ductile fracture criterion stress triaxiality inverse analysis fracture threshold surface fitting

ClassificationCode：TG113.2

year,vol(issue):pagenumber：2017,42(5):113-118

Abstract：

Ductile fracture criterion is generally used to predict ductile fracture in metal forming process, however its accuracy significantly relays on the calibration of parameters. According to the commonly used inverse analysis and surface fitting by experimental and numerical method, a new calibration method based on the integral of fracture threshold value was proposed. Then, from a series of experimental results of the wide range of stress triaxiality and by applying the three calibration methods above, parameters of L-H ductile fracture criterion were solved. Finally, a comparison of the three calibration methods above were performed, and their advantages and disadvantages were given respectively. Contrast to the normal inverse analysis method, the comparison results show that the calibration method of integral of fracture threshold value and surface fitting method can improve computing efficiency. Meanwhile, the new method can provide a more accurate prediction of fracture than the surface fitting method.

Funds：

国家自然科学基金资助项目（51475296）；东莞市产学研合作项目（2015509124212）

孟烨晖（1993-），男，硕士研究生庄新村（1980-），男，博士，副教授

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