中文摘要：

采用反演法确定了马氏体不锈钢410的Johnson-Cook本构方程材料参数.剪切实验采用的剪切速率为1～5000s-1,温度为20～1000℃.有限元模拟在Abaqus软件平台上进行.采用Johnson-Cook模型,施加与实验相同的初始条件.通过Matlab非线性最小二乘法优化程序来调整有限元模型材料参数,找到合适值,使得模拟得到的力-位移曲线与实验得到曲线相吻合.结果表明,所得参数都能很好地代表不锈钢410在高温高变形速度下的流动特性,Johnson-Cook模型不能描述材料破坏阶段的行为特征.

英文摘要：

An inverse approach was applied to identify the material parameters of Johnson-Cook constitutive equation which is largely used for describing materials＇ behaviour in previous conditions.The shear experiments over a wide range of temperatures（20-1 000 °C） and strain rates（1-5 000 s-1） and the finite element method simulations were carried out for martensitic stainless steel 410.The goal of the inverse method is to find a parameter array which minimizes the difference between the experimental and numerical force-displacement data.The initial parameters are optimized by nonlinear least-square method.It is observed that the parameters optimized generally represent well the flow behaviours of material except the damage domain.