贮箱顶盖应力松弛时效成形过程建模仿真与试验

FE Simulation Modeling and Experimental of Stress Relaxation Age Forming Process of Tank Cover

基于2219铝合金的应力松弛时效宏微观统一本构方程,对其进行用户子程序二次开发,并编译到非线性有限元分析软件MSC. Marc,建立了2219铝合金贮箱顶盖应力松弛时效成形过程的仿真模型,分析了顶盖应力松弛时效成形过程的应力应变和力学性能演变规律;开展了基于回弹补偿分析的模具型面优化设计,确定了满足成形目标要求的模具型面,进行了2219铝合金贮箱顶盖应力松弛时效成形试验,并与仿真结果进行对比分析。结果表明:顶盖应力松弛时效成形试验结果与有限元仿真结果吻合较好,两者成形型面半径相对偏差0.22%,屈服强度相对偏差为3.13%;顶盖成形试验后的型面与目标型面半径的相对偏差为0.52%,力学性能满足目标设计要求。综上所述,所建立的有限元模型能够准确预测顶盖的应力松弛时效成形过程形性演变规律,可以用来指导2219铝合金贮箱顶盖应力松弛时效成形制造。

Based on the macro-micro unifed constitutive equation of stress relaxation of 2219 aluminium alloy, the user subroutine was redeveloped and compiled into nonlinear fnite element analysis software MSC. Marc. The simulation model of the stress-relaxation aging forming process of the 2219 aluminum alloy tank cover was established and the stress-strain and mechanical property evolution of the stress-relaxation aging forming process of the cover were analyzed. The optimization design of the mold surface based on springback compensation analysis is performed, and the mold profle that meets the requirements of the forming target is determined. The stress relaxation aging forming experiment of 2219 aluminum alloy was carried out. The results of experiment and simulation were analyzed. The results show that the experiment results of stress relaxation aging forming agree well with the results of fnite element simulation. The relative deviation of the forming surface radiuses between experiment and simulation is 0.22%, and the relative deviation in the yield strength is 3.13%. The relative deviation of the surface radiuses between the experiment and the target profle is 0.52%, and mechanical properties meet target design requirements. To sum up, the established fnite element model can accurately predict the shape and property evolution of the stress relaxation aging process of the cover, and can be used to guide the stress relaxation aging forming of the 2219 aluminum alloy tank cover.