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进行了2060-T8铝锂合金不同温度、脉冲电流密度、占空比和脉冲频率的电辅助单向拉伸实验。研究表明:在实验研究的范围内,随着电流密度的增加,材料的变形抗力和断裂延伸率都会下降,占空比和脉冲频率对纯电致塑性没有影响。基于Johnson-Cook模型,引入电辅助特征,建立了耦合温度和脉冲电流参数的材料本构方程。利用该本构方程计算的结果与实验吻合的较好,说明所建立的材料本构方程能够准确的预测2060-T8铝锂合金在电辅助条件下的流动应力变化趋势。
The electrical assisted uniaxial tension experiments of 2060-T8 Al-Li alloy at different temperatures, pulse current density, duty cycle and pulse frequency were carried out. The results show that, with the increase of current density, the deformation resistance and the elongation at break of the material will decrease in the range of experimental study. The duty cycle and pulse frequency have no effect on the pure electrical plasticity. Based on the Johnson-Cook model, the electrical assist features are introduced to establish the material constitutive equation of coupled temperature and pulse current parameters. The results calculated by the constitutive equation are in good agreement with the experimental data, which shows that the constitutive equation of the material can accurately predict the trend of the flow stress change of 2060-T8 Al-Li alloy under the condition of electrical assist.