H62铜合金本构模型构建及游动芯头拉拔力影响分析

以H62铜合金为实验材料,进行不同应变率下的单向拉伸试验。采用唯象建模方法建立铜合金的本构模型。通过二次开发,将本构模型导入MARC,以拉拔速度为实验参数,对游动芯头拉拔过程进行数值模拟。结果表明:利用强化系数与黏性系数建立的本构模型,对不同应变率下单向拉伸实验数据拟合效果较好,弹黏塑性模型对不同应变率下拉伸成形具有较好的适用性;随着拉拔速度增加,拉拔力逐渐增大,但增加的幅度较小。

Construction of H62 copper alloy constitutive model and analysis of the influence of the drawing force on the floating plug

Using H62 copper alloy as the experimental material does uni-axial tensile experiences under different strain rates,the constitutive model of copper alloy was established by phenomenological modeling method. throughSsecondary developmentS,the model is imported into MARC,setting the drawing speed as the experimental parameter does numerical simulation of drawing process of the floating plug.The results show that constitutive model established by using the coefficient of reinforcement and viscosity coefficient fits the effect of uni-axial tensile test data under different strain rate better,the elastic-viscoplastic model has good applicability for stretch forming under different strain rates.With the increase of the drawing speed,the drawing force increased gradually, but the increase was smaller.