电脉冲时效成形仿真

Simulation for electric pulse age forming

为了描述电脉冲处理中材料的应力应变关系,提出了一个唯象型的本构方程。本构方程由应力项、时间项和电流密度项组成。通过参数识别确定了本构方程中的材料参数,并将本构方程应用于薄板的V形弯曲和T型试件曲率弯曲的电脉冲时效成形仿真当中。通过仿真结果和现有试验结果的对比,验证了本构方程的有效性,可以反映电流密度、脉冲时间和脉冲次数对电脉冲处理效果的影响。仿真结果显示,电脉冲时效成形的效率远大于传统的热时效成形,而且在设计模具时可以不考虑回弹问题。

To describe stress-strain relationship of material in electrical pulse treatment,a phenomenological constitutive equation was presented. The constitutive equation consisted of stress term,time term and electrical density term. The material parameters in the equation were evaluated by parameter identification methods,then,the equation was applied in two finite element models,namely the electrical pulse age forming models for thin sheet V-bending and T-beam curve bending. Through the comparison between the simulation results with existed experimental results,the effectiveness of the constitutive equation was proved,which can reflect the effects of electrical density,pulse time and pulse number on electrical pulse treatment. The simulation results suggest that electrical pulse age forming has far greater efficiency than traditional heat age forming. Moreover,springback phenomena can be ignored during die design for electrical pulse age forming.