Owing to electromechanical coupling of piezoelectric fiber composites, they have been widely used in sensing and active control of aeronautic and aerospace structures. In order to describe the interface fracture of piezoelectric fiber composites, a micromechanically motivated interface model based on a cohesive zone model is developed, and it is closer to the actual debonding process including contact and friction effects. In this study, the proposed interface model is formed through incorporating contact effect and a Coulomb friction law into a bilinear traction-separation law, and the electromechanical relationships across separated and contacted crack surfaces are provided. And for purpose of analyzing single piezoelectric fiber debonding, an axisymmetric model and its double series solution are adopted. Comparing with existing experiment and simulation results, the proposed model takes the friction related to the normal pressure varying with the gap between crack surfaces into account, and it is able to qualitatively capture salient features of the experimental record, and guarantee a smooth transition from cohesive debonding to frictional sliding. Furthermore, the piezoelectric fiber push-out behavior is investigated including initial perfect bonded, partial debonding with interface softening and frictional sliding after complete debonding. The dependences of different parameters, such as fiber radius, fiber length, electric field and interface properties, on the load-displacement curve and the responses around piezoelectric fiber are also investigated. It can be revealed that piezoelectric fibers can be designed to monitor and tailor the fracture behavior of composites.

由于压电纤维复合材料的机电耦合，它们已广泛用于航空和航天结构的传感和主动控制。为了描述压电纤维复合材料的界面断裂，建立了基于内聚区模型的微机械界面模型，该模型更接近于实际的脱胶过程，包括接触和摩擦效应。在这项研究中，所提出的界面模型是通过将接触效应和库仑摩擦定律合并到双线性牵引力-分离定律中而形成的，并提供了分离和接触的裂纹表面之间的机电关系。为了分析单根压电纤维的剥离，采用了轴对称模型及其双级数解。与现有的实验和仿真结果相比，该模型考虑了与常压相关的摩擦力随裂纹表面间隙的变化，并且能够定性地捕获实验记录的显着特征，并保证从内聚力的平稳过渡。脱去摩擦滑动。此外，研究了压电纤维的推出行为，包括初始的完美粘结，具有界面软化的部分粘结以及完全脱胶后的摩擦滑动。还研究了纤维半径，纤维长度，电场和界面特性等不同参数对载荷-位移曲线的影响以及压电纤维周围的响应。