Transactions of Materials and Heat Treatment

Title：Damage evolution on 7075-T6 aluminum alloy under complex strain path loading

Authors： Zheng Tangjie1 2 Li Gui1 2 3 Xu Cheng1 2 Fang Xuebin1 2

Unit： 1.Key Laboratory of Metallurgical Equipment and Control Technology Education Ministry Wuhan University of Science and Technology 2. Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology 3.Precision Manufacturing Institute Wuhan University of Science and Technology

KeyWords： 7075-T6 aluminum alloy damage model complex strain path void volume fraction uniaxial tension

ClassificationCode：TG335

year,vol(issue):pagenumber：2022,47(12):227-233

Abstract：

For 7075-T6 high-strength aluminum alloy, the mechanical properties after loading in complex strain paths were ascertained, and complex strain assembly model with adjustable deformation was designed. Based on the GTN constitutive model, the simulations of uniaxial tension and uniaxial tension under complex strain path loading were carried out, respectively, the influences of different deformations on the displacement-load curve and true stress-true strain curve for simulated specimen were studied, and the influences of four void volume fractions of fO, fN,fC , fF on the true stress-true strain curve for specimen under complex strain path loading were analyzed. The results show that after applying complex strain paths, the stress and strain at fracture site of sample decrease greatly. fO and fC mainly affect the necking stage of the curve, fN mainly affects the yield stage of the curve, while fF has little effect on the curve. The results show that compared with the simulation results of uniaxial tension, the true stress-true strain curve under complex strain path loading is more accurate for the damage evolution process of

automotive panels during the stamping production process.

Funds：

华中科技大学材料成形与模具技术国家重点实验室开放基金资助项目(P2020-019)

郑唐杰（1997-），男，硕士 E-mail：jiemao1010@163.com 通信作者：李贵（1983-），男，博士，副教授 E-mail：leegui2030@wust.edu.cn

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