基于指数方程的金属材料热变形本构模型

兵器材料科学与工程 , 2014, (5): 58-63.

基于指数方程的金属材料热变形本构模型

郭心怡 ^1, , 谭秋林 ^2, , 秦丽 ^3, , 周兆英 ^4,

1.中北大学仪器科学与动态测试教育部重点实验室，山西太原030051; 清华大学精密仪器与机械学系，北京100084

2.中北大学仪器科学与动态测试教育部重点实验室，山西太原030051; 清华大学精密仪器与机械学系，北京100084

3.中北大学仪器科学与动态测试教育部重点实验室,山西太原,030051

4.清华大学精密仪器与机械学系,北京,100084

基金项目: 山西省回国留学人员科研资助项目(2013-077)

关键词：本构模型 , 指数方程 , 金属材料 , 热变形

Constitutive model for metal materials during hot deformation based on exponential equation

Keywords： constitutive model , exponential equation , metal materials , hot deformation

针对材料的热变形，基于常见的指数方程，通过对相关表达式的具体推导，构建了一种可以较为有效地描述应变、应变速率和温度对流动应力影响的本构模型。将模型用于预测纯铝的热变形流变行为，得到的预测曲线和实验曲线吻合较好。结果表明，所建本构模型有效，构建方法合理，能够有效预测该材料在热变形中的流动应力。

To more effectively describe the effects of strain,strain rate and temperature on the deformation behaviors of metal material during hot deformation,the constitutive model was developed by deriving the correlative relations based on the exponential equation. The deformation behavior of Al 99.999%during hot deformation was described by the proposed model. The stress-strain curves predicted by the developed constitutive model agree well with experimental results,which con fi rms that the developed constitutive model can give an accurate estimate of the flow stress for this material. The developed model is effective, the method is reasonable and can effectively model the flow behavior of metal materials during hot deformation.

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