Constitutive Equation for Plastic Behavior of Hydrostatic-Pressure-Dependent Polymers
Constitutive Equation for Plastic Behavior of Hydrostatic-Pressure-Dependent Polymers
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静水压力相关聚合物塑性行为的本构方程
DOI：
10.2472/jsms.52.12appendix_243
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Y. Sanomura
中科院分区：
文献类型：
--
作者：
Y. Sanomura
静水压力依赖的聚合物的力学行为进行了研究，使用本构建模的屈服面所描述的第一和第二不变量的应力和非关联的流动规则，满足不可压缩的假设。提出了与率无关的塑性内变量理论，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有很大不同。将该模型与Spitzig和里士满的单轴拉伸和压缩实验结果以及Silano等人的高压扭转实验结果进行了比较。
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.