Abstract A unified viscoplastic constitutive model coupled with a physically-based damage variable, is proposed to capture the cyclic mechanical behavior and microstructural evolution of the material at elevated temperature. The mechanical strength can be reduced by the decrease in the dislocation density, the coarsening of the martensitic lath and the loss of the martensitic structure under cyclic loading. The proposed physically-based damage variable is driven by the evolutions of dislocation density and martensitic lath width. The good comparisons with test results mean that the proposed model can reasonably model the cyclic elastic-viscoplastic constitutive behavior of the material at high temperature.

中文翻译：

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基于物理的马氏体涡轮转子材料在高温下的循环软化和损伤行为建模

摘要 提出了一种统一的粘塑性本构模型，结合基于物理的损伤变量，以捕捉材料在高温下的循环力学行为和微观结构演变。机械强度可以通过位错密度的降低、马氏体板条的粗化和循环载荷下马氏体组织的损失而降低。提出的基于物理的损伤变量是由位错密度和马氏体板条宽度的演变驱动的。与测试结果的良好比较意味着所提出的模型可以合理地模拟材料在高温下的循环弹粘塑性本构行为。