Transactions of Materials and Heat Treatment

Title：Influences of deformation velocity on fracture behavior of high strength steel in hot stamping forming

Authors： Wang Min Zhang Chun Xiao Haifeng Li Bing Hu Zhihua

Unit： Hubei University of Automotive Technology Huazhong University of Science and Technology

KeyWords： high strength steel hot stamping forming fracture deformation velocity U-shaped beam

ClassificationCode：TH133.3；TP395.02

year,vol(issue):pagenumber：2017,42(1):23-26

Abstract：

For the typical feature structure of automotive hot-stamped part U-shaped beam, the prediction of fracture behavior of high strength sheet was realized effectively by implementing the fracture criterion at elevated temperature of BR1500HS into the finite element model of hot stamping forming. Based on the prediction model, the influences of deformation velocity on the fracture initiation moment, location and propagation direction were clarified. The results show that with the increase of deformation velocity, the fracture initiation moment decreases, but the fracture initiation location has no obvious change. The initial fracture locates at the side wall at one end of the U-shaped beam, and the crack propagates along the longitudinal direction of the U-shaped beam. Then, the secondary fracture occurs at the other end of the U-shaped beam, and the secondary crack also propagates along the longitudinal direction, but the initial crack does not converge. When the deformation velocity is small, the secondary fracture locates at the side wall near the die fillet; and when the deformation velocity is large, the secondary fracture locates at the side wall near the punch fillet.

Funds：

国家自然科学基金资助项目（51205116）；湖北省自然科学基金资助项目（2014CFB628）；湖北省高等学校优秀中青年科技创新团队计划项目（T201518）；汽车动力传动与电子控制湖北省重点实验室(湖北汽车工业学院)开放基金资助项目（ZDK1201601）

王敏（1979-），女，博士，副教授 E-mail：1274385083@qq.com

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