Viscoplastic Modeling of Solid Polymer Inelastic Deformation

为了在结构和制造过程的应力分析中充分利用可用的计算能力，需要现代材料和加载条件的本构方程。固体聚合物与时间(速率)相关的力学行为是本程序的目标。提出了一种实验与理论相结合的研究方法。针对固体聚合物的非弹性行为，对基于超应力的增量粘塑性理论进行了研究和改进。对几种商用固体聚合物的单轴和双向筛选试验将导致选择两种聚合物，并为其建立本构方程。

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.