Transactions of Materials and Heat Treatment

Title：Test and numerical simulation of U-shape bending part for DP980 high strength steel

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ClassificationCode：TG386

year,vol(issue):pagenumber：2020,45(4):70-75

Abstract：

In order to evaluate the forming and springback characteristics of DP980 high strength steel, the parameters of Yoshida-Uemori hardening model which considers Bauschinger effect were obtained through loading-unloading test and uniaxial tension-compression cycle loading test, and the U-shaped bending test of DP980 high strength steel was studied. The results show that the U-shaped part of DP980 high strength steel is easy to crack near the fillet of die, and it is necessary to reduce the blank holder force and increase the fillet of die in the forming process. The springback amount of material is related to the blank holder force, and it can be reduced by increasing the blank holder force. However, excessive blank holder force may lead to crack. Therefore, it is important to choose a reasonable blank holder force. At the same time, the springback of U-shape part after forming was simulated by using the isotropic hardening model and Yoshida-Uemori hardening model. By comparing the experimental data with the springback result of simulation, it is found that the simulation results of Yoshida-Uemori hardening model are in good agreement with the experimental results, which verifies the high accuracy of Yoshida-Uemori hardening model to simulate the springback. So it can be applied in springback simulation.

Funds：

国家重点研发计划项目（2017YFB0304403）

张华平（1985-），男，本科，助理工程师 E-mail：zhanghuaping@baosteel.com 通讯作者：李亚（1989-），女，硕士，中级工程师 E-mail：liya@baosteel.com

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