Viscoplastic Modeling of Solid Polymer Inelastic Deformation

0000187为了充分利用现有的计算能力进行结构和制造过程的应力分析，需要现代材料和载荷条件的本构方程。固体聚合物的时间（速率）依赖性力学行为是该计划的目标。提出了一种结合实验/理论研究。对基于过应力（VBO）的增量粘塑性理论进行了改进，使之适用于固体聚合物的非弹性行为。对几种市售固体聚合物的单轴和双轴筛选试验将导致选择两种聚合物，并将开发其本构方程。

0000187To make full use of the available computing power in stress analyses of structures and of manufacturing processes constitutive equations for modern materials and loading conditions are needed. The time (rate)-dependent mechanical behavior of solid polymers is the target of this program. A combined experimental/theoretical investigation is proposed. The incremental viscoplasticity theory based on overstress (VBO) modified for solid polymer inelastic behavior will be investigated and improved. Uniaxial and biaxial screening tests on several commercially available solid polymers will lead to the selection of two polymers for which a constitutive equation will be developed.