Formulation and Programming of a Dynamic Constitutive Model at High Strain Rates in ABAQUS for the 304NG Stainless Steel
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摘要: 304NG不锈钢是反应堆堆内构件的常用材料,其高应变率动态特性对冲击载荷下的响应有重要影响,而现有有限元平台中并无适用于该材料的高应变率动态模型.进行了304NG不锈钢冲击拉伸试验,提出了新的动态本构模型,并利用径向回归算法和稳定的二分法迭代,在ABAQUS平台上编写了用户材料子程序UMAT,实现了率相关模型的隐式应力求解.最后通过有限元动态分析验证了UMAT子程序,计算结果与试验数据的对比表明二者吻合得很好,UMAT子程序可用于结构在冲击加载下的响应分析.Abstract: The 304NG stainless steel is commonly used in reactor internal structural members. High strain rate dynamic characteristics of this material have important influences on the structural responses under impact loads. However, there is no suitable constitutive model for the high strain rate dynamic behaviors of this material in existing FEM programs as yet. Based on the dynamic tensile tests of the 304NG stainless steel, a new dynamic constitutive model for it was proposed. With the radial return algorithm and the stable dichotomy iteration method, a UMAT subroutine for the ratedependent model was written into ABAQUS, with the implicit stress update algorithm achieved. Then the dynamic FEM analyses of several examples were performed to verify the UMAT subroutine. The results indicate that the proposed dynamic constitutive model is in good agreement with the test data. The UMAT subroutine is helpful to be applied to response analysis of similar structures under impact loads.
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Key words:
- UMAT /
- high strain rate /
- rate-dependent /
- dynamic constitutive model /
- radial return algorithm
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