Transactions of Materials and Heat Treatment

Title：GTN damage model parameters calibration on laser tailor welded joint for DP780 high strength dual-phase steel

Authors： Guo Jianchao1 He Zhipeng1 Yan Weilin2 Wei Chunhua2 Zhao Lin1

Unit： 1.Guilin University of Technology at Nanning 2.Guangxi University

KeyWords： DP780 high strength dual-phase steel laser tailor welded joint GTN damage model damage parameter limit dome height failure mode

ClassificationCode：TG407

year,vol(issue):pagenumber：2023,48(2):241-249

Abstract：

In order to obtain the simulation parameters of laser tailor welded joint for DP780 high strength dual-phase steel, the laser tailor welded joint was area-refined according to the mixing law, and the finite element (FE) modeling of base metal, weld and longitudinal joint tensile test and limit dome height(LDH) test was conducted by ABAQUS FE simulation software. Then, according to the results of engineering stress-engineering strain for tensile test, fracture position of tensile sample and fracture failure mode of the laser tailor welded blanks (LTWBs) and the FE inversion method, the parameters of the GTN damage model in each joint partition were determined, and the tensile test and LDH test of the transverse joint were simulated. The results show that the tensile test curves of joints under different heat inputs are consistent with the simulated curves, and the simulated fracture position is consistent with the actual fracture position. The LDH value when the tailor welded blank fails is close to the test value, and the failure mode of tailor welded blank is in good agreement with the test results.

Funds：

2017年度广西高校中青年教师基础能力提升项目（2017KY0255）

作者简介：郭建超（1992-），男，硕士，助教，E-mail：2890119367@qq.com；通信作者：赵琳（1980-），女，学士，高级工程师，E-mail：298669743@qq.com

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