Strain rate effect of yield strength has been a hot topic for a long time in impact mechanics over decades, and it is important to explore the physical mechanism behind this phenomenon. In this study, a one-dimensional stress bar analytical model for the dynamic yield stress of metal materials under a sinusoidal stress wave pulse is presented based on the structural-temporal failure criterion, and the corresponding numerical results accord well with previous experimental data under the high strain rate. Moreover, the dynamic yield strength can be determined by the nondimensional parameters κ and χ as well as a material parameter α. Specifically, the first nondimensional parameter κ can be determined by the ratio between the loading amplitude and quasi-static yield strength. The second nondimensional parameter χ is calculated by the ratio between the loading period and the incubation time. 0herefore, the dynamic yield strength can be essentially determined by the quasi-static material parameters, incubation time and loading parameters. The so-called strain-rate effect on the yield strength should be treated as an interaction process parameter in a dynamic loading—material system and should not be considered as an intrinsic material property anymore. additionally, this study may help researchers to determine the parameters in the numerical models including the strain rate effect of the dynamic yield surface.

中文翻译：

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金属动态屈服强度的解析模型

几十年来，屈服强度的应变率效应一直是冲击力学中的热门话题，探索这种现象背后的物理机制非常重要。本研究基于结构-时间破坏准则，建立了正弦应力波脉冲作用下金属材料动态屈服应力的一维应力条分析模型，相应的数值结果与前人实验数据吻合较好。高应变率。此外，动态屈服强度可以由无量纲参数 κ 和 χ 以及材料参数 α 确定。具体来说，第一无量纲参数κ可以由加载幅度与准静态屈服强度的比值确定。第二个无量纲参数 χ 是通过加载时间和孵育时间之间的比率计算的。0因此，动态屈服强度基本上可以由准静态材料参数、孵育时间和加载参数决定。所谓的应变率对屈服强度的影响应该被视为动态加载材料系统中的相互作用过程参数，不应再被视为一种固有的材料特性。此外，这项研究可以帮助研究人员确定数值模型中的参数，包括动态屈服面的应变率效应。所谓的应变率对屈服强度的影响应该被视为动态加载材料系统中的相互作用过程参数，不应再被视为一种固有的材料特性。此外，这项研究可以帮助研究人员确定数值模型中的参数，包括动态屈服面的应变率效应。所谓的应变率对屈服强度的影响应该被视为动态加载材料系统中的相互作用过程参数，不应再被视为一种固有的材料特性。此外，这项研究可以帮助研究人员确定数值模型中的参数，包括动态屈服面的应变率效应。