Transactions of Materials and Heat Treatment

Title：Simulation analysis on drop hammer crush of high-strength steel based on GISSMO fracture failure model

Authors： Kong Yuqiang Zhang Xiaoying Duan Peng Wang Guilu

Unit： Zhengzhou University of Science and Technology

KeyWords： steel with high hole-expanding radio fracture failure drop hammer crush stress triaxiality instability curve

ClassificationCode：TG386；TG146

year,vol(issue):pagenumber：2024,49(3):230-239

Abstract：

The DP980 steels with different properties were selected to carry out the failure analysis of drop hammer crushing test process. Based on the GISSMO fracture failure model, five different fracture failure samples were designed，and the equivalent plastic strain at the fracture time was obtained. The simulation analysis model was built, the stress triaxiality of each sample at the fracture time was extracted, and the fracture failure curve and the plastic instability curve were obtained by fitting. The comparative analysis on the bearing and energy absorption for materials，the failure processes of elements at different positions and the damage of elements at the same position were carried out by the combination method of simulation and experiment. The research results show that the hole expansion rate of DP980 steel with high hole-expanding performance reaches 77.6%, which is significantly higher than that of ordinary DP980 steel，and its local extensibility is larger than that of ordinary DP980 steel. The unit crushing displacement energy absorption of DP980 steel with high hole-expanding performance is 21.74% higher than that of ordinary DP980 steel, which showing better energy absorption characteristics.

Funds：

河南省科技厅科技攻关项目（232102220076）；河南省高等学校重点科研项目（24B413011）；郑州科技学院科技攻关项目（2022XJKY09）

作者简介：孔玉强（1989-），男，硕士，讲师，E-mail：sxymtxy@163.com；通信作者：张晓莹（1985-），女，硕士，副教授，E-mail：funworldzxy@163.com

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