锻压技术

复杂应变路径加载下7075-T6铝合金的损伤演化

英文标题：Damage evolution on 7075-T6 aluminum alloy under complex strain path loading

作者：郑唐杰1 2 李贵1 2 3 许成1 2 方学彬1 2

单位：1.武汉科技大学冶金装备及其控制教育部重点试验室 2. 武汉科技大学机械传动与制造过程 3. 武汉科技大学精密制造研究院

分类号：TG335

出版年,卷(期):页码：2022,47(12):227-233

摘要：

以7075-T6高强铝合金为研究对象，探明其在复杂应变路径加载后的力学性能，设计了可调节变形量的复杂应变装配模型，并基于GTN本构模型进行了单向拉伸和复杂应变路径加载下单向拉伸的仿真模拟，研究了不同变形量对仿真试样的位移-载荷曲线和真实应力-真实应变曲线的影响，分析了fO、fN、fC、fF这4个孔洞体积分数对复杂应变路径加载下试样的真实应力-真实应变曲线的影响。结果表明：在施加复杂应变路径后，试样断裂处所受的应力减小，应变大幅减小；fO和fC主要影响曲线的颈缩阶段，fN主要影响曲线的屈服阶段，而fF对曲线的影响较小。结果显示，相较于单向拉伸的仿真结果，复杂应变路径加载下的真实应力-真实应变曲线能更准确地反映汽车覆盖件在冲压生产过程中的损伤演化过程。

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.

基金项目：

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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