Abstract

Microscopic voids/defects always occur in brittle piezoelectric fiber during the preparation. In addition, inconsistent material properties between the reinforced fibers and the matrix led to some microcracks located at the interface in matrix materials. In order to obtain equivalent properties of piezoelectric composites with respect to initial voids/defects, a parametric microscopic finite-volume model was constructed in this paper. To this end, the mechanical-electric coupling constitutive relation was implanted into the parametric FVDAM model to describe their piezoelectric characteristics. To verify the presented coupled mechanical-electric model, the numerical results of local stress and electric field distributions acquired by finite element method were also indicated for a comparison. On this basis, equivalent modulus and equivalent electrical properties with full consideration of local damages were also investigated by the presented microscale model.

摘要

在制备过程中，脆性压电纤维中总是会出现微观空隙/缺陷。此外，增强纤维与基体之间的材料性能不一致导致一些微裂纹位于基体材料的界面处。为了获得压电复合材料在初始空隙/缺陷方面的等效性能，本文构建了参数化微观有限体积模型。为此，将机电耦合本构关系植入参数化 FVDAM 模型中，以描述其压电特性。为了验证所提出的机电耦合模型，还给出了通过有限元方法获得的局部应力和电场分布的数值结果以进行比较。以这个为基础，