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首页> 外文期刊>Materials Science Research International >Constitutive Equation for Plastic Behavior of Hydrostatic-Pressure-Dependent Polymers
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Constitutive Equation for Plastic Behavior of Hydrostatic-Pressure-Dependent Polymers

机译：静水压相关聚合物塑性行为的本构方程

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摘要

Hydrostatic pressure dependence of the mechanical behavior of polymers is studied, using constitutive modeling of the yield surface described by the first and the second invariants of stress and the nonassociated flow rule that satisfies the incompressible hypothesis. An internal variable theory of rate-independent plasticity is presented, which incorporates isotropic hardening as a function of accumulated plastic strain. After the determination of material constants under uniaxial tension and compression, the model shows that the von Mises-type effective stress-plastic strain curves under multiaxial load are quite different from those under uniaxial load. The model is compared with the experimental results of uniaxial tension and compression obtained by Spitzig and Richmond and those of torsion obtained by Silano et al. under high pressure.
机译：使用由第一和第二应力不变量以及满足不可压缩假设的非关联流动规则描述的屈服面的本构模型，研究了聚合物力学行为的静水压力依赖性。提出了一种与速率无关的塑性的内部变量理论，该理论将各向同性硬化作为累积塑性应变的函数。在确定了单轴拉伸和压缩下的材料常数之后，该模型表明，多轴载荷下的von Mises型有效应力-塑性应变曲线与单轴载荷下的完全不同。将模型与Spitzig和Richmond获得的单轴拉伸和压缩实验结果以及Silano等获得的扭转的实验结果进行了比较。在高压下。

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