光纤智能复合材料损伤行为的跨尺度耦合分析

Optical fiber sensors are often embedded into composites to provide long-term, real-time monitoring of deformation and damage. Previous studies have shown that the embedding of optical fibers can compromise the integrity and continuity of the matrix material, leading to the formation of matrix-fiber interfaces and high stress concentrations that have a negative impact on the mechanical properties of the composite. Using a cross-scale methodology, we investigated the effect of microstructures such as optical fibers on the macroscopic mechanical properties of composites. Through the two processes of localization and homogenization of the strain field, we coupled the macro scale model of the composite with the micro scale model. The mechanical response and progressive failure laws of composites under tensile loading with respect to the fiber diameter, the fine size parameter pairs of the interfacial structure have been investigated. The findings indicated that as the fiber diameter increases, the stiffness of the composite material decreases, stress concentration coefficient increases, and tensile strength decreases. Similarly, as the length of the resin-rich zone increased, the stiffness of the composite material decreased, the stress concentration coefficient decreased, and the strength increased.