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A constitutive model for dynamic plasticity of FCC metals

机译：FCC金属动态可塑性的本构模型

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This paper proposes a new constitutive model to describe the dynamic plasticity of FCC metals using the thermal activation mechanism of dislocation motion. In the model development, the constitutive parameters were directly linked with the characteristics of microstructures of materials. As an example of its application, the model was used to describe the behavior of OFHC copper. To determine the globally optimized parameters of the constitutive model for OFHC copper, an improved multi-variable optimization method of constrained nonlinear programming was used based on the flow stress of the material measured experimentally. A comparison with some models and experimental data in the literature shows that the new model is simple to apply and is much better in terms of its prediction accuracy. It was shown that compared with the MTS model the new constitutive equation is explicit and can be easily embedded into a computational code of material dynamics; while compared with the Zerilli-Armstrong and Johnson-Cook models the new one reflects more precisely experimental observations. It was concluded that the new model is applicable to a wide range of problems with temperature variation from 77 K to 1096 K, strain rates ranging from 10~(-3) s~(-1) to 10~4 s~(-1) and strain as high as 1.
机译：本文提出了一种新的本构模型，利用位错运动的热激活机理来描述FCC金属的动态可塑性。在模型开发中，本构参数与材料的微观结构特征直接相关。作为其应用的示例，该模型用于描述OFHC铜的行为。为了确定OFHC铜本构模型的全局优化参数，基于实验测得的材料的流动应力，采用了一种改进的约束非线性规划的多变量优化方法。与文献中一些模型和实验数据的比较表明，新模型易于应用，并且在预测精度方面要好得多。结果表明，与MTS模型相比，新的本构方程是显式的，可以轻松地嵌入到材料动力学计算代码中。与Zerilli-Armstrong和Johnson-Cook模型相比，新模型更精确地反映了实验观察结果。结论是，该新模型适用于温度范围从77 K到1096 K，应变率从10〜（-3）s〜（-1）到10〜4 s〜（-1）的各种问题。 ），应变高达1。

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