Modeling and characterization on electroplastic effect during dynamic deformation of 5182-O aluminum alloy

5182-O铝合金动态变形过程中电塑性效应的建模与表征

The coupling effects of electrical pulse,temperature,strain rate,and strain on the flow behavior and plasticity of 5182-O aluminum alloy were investigated and characterized.The isothermal tensile test and electrically-assisted isothermal tensile test were performed at the same temperature,and three typical models were further embedded in ABAQUS/Explicit for numerical simulation to illustrate the electroplastic effect.The results show that electric pulse reduces the deformation resistance but enhances the elongation greatly.The calibration accuracy of the proposed modified Lim−Huh model for highly nonlinear and coupled dynamic hardening behavior is not much improved compared to the modified Kocks−Mecking model.Moreover,the artificial neural network model is very suitable to describe the macromechenical response of materials under the coupling effect of different variables.

研究并表征电脉冲、温度、应变速率和应变耦合效应对5182-O铝合金流动行为和塑性的影响。在相同温度下进行等温拉伸试验和电辅助等温拉伸试验,并将3种典型模型嵌入ABAQUS/Explicit中进行数值模拟以阐明电塑性效应。结果表明,电脉冲能显著降低合金的变形抗力但提高伸长率。与修正的Kocks−Mecking模型相比,所提出的修正Lim−Huh模型对高度非线性动态硬化行为的标定精度无明显提高。此外,神经网络模型非常适合描述不同变量耦合作用下的宏观力学响应。