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首页> 外文期刊>International Journal of Mechanical Sciences >Numerical simulation of the localization behavior of hydrostatic-stress-sensitive metals
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Numerical simulation of the localization behavior of hydrostatic-stress-sensitive metals

机译：静水压力敏感金属局部化行为的数值模拟

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The present paper deals with the numerical simulation of the elastic-plastic deformation and localization behavior of solids which are plastically dilatant and sensitive to hydrostatic stresses. The model is based on a generalized macroscopic theory taking into account macroscopic as well as microscopic experimental data obtained from tests with iron-based metals. It shows that hydrostatic components may have a significant effect on the onset of localization and the associated deformation modes, and that they generally lead to a notable decrease in ductility. The continuum formulation relics on a generalized I{sub}1 -J{sub}2-J{sub}3 yield criterion to describe the effect of the hydrostatic stress on the plastic flow properties of metals. In contrast to classical theories of metal plasticity, the evolution of the plastic part of the strain rate tensor is determined by a non-associated flow rule based on a plastic potential function which is expressed in terms of stress invariants and kinematic parameters. Numerical simulations of the elastic-plastic deformation behavior of hydrostatic-stress-sensitive metals show the physical effects of the model parameters and also demonstrate the efficiency of the formulation. Their results arc in excellent agreement with available experimental data. A variety of large-strain elastic-plastic problems involving pronounced localizations is presented, and the influence of various model parameters on the deformation and localization behavior of hydrostatic-stress-sensitive metals is discussed.
机译：本文对可塑性膨胀且对静水压力敏感的固体的弹塑性变形和局部化行为进行了数值模拟。该模型基于广义的宏观理论，其中考虑了从铁基金属的测试中获得的宏观和微观实验数据。它表明静水压力分量可能对定位的开始和相关的变形模式有重大影响，并且它们通常导致延展性显着下降。连续体公式基于广义的I {sub} 1-J {sub} 2-J {sub} 3屈服准则来描述静水压力对金属塑性流动特性的影响。与经典的金属可塑性理论相反，应变率张量的塑性部分的演化是基于塑性势函数通过非关联流规则确定的，塑性势函数用应力不变性和运动学参数表示。流体静应力敏感金属的弹塑性变形行为的数值模拟显示了模型参数的物理影响，并且还证明了配方的有效性。他们的结果与现有的实验数据非常吻合。提出了各种涉及明显局部化的大应变弹塑性问题，并讨论了各种模型参数对静水应力敏感金属的变形和局部化行为的影响。

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