Characterizing fiber-matrix debond and fiber interaction mechanisms by full-field measurements

An experimental approach is developed and utilized to characterize the fiber-matrix interfacial debonding mechanism its effect on matrix cracking in unidirectional (UD) fiber composites. Local deformation response at interface first studied by analyzing strain fields vicinity of macro fibers single-fiber samples. A practical for identification normal cohesive behavior presented implemented a finite element model that replicates findings. Fiber-to-fiber interaction, debond formation, failure mechanisms multiple systems are then varying distance angle between adjacent double-fiber The results indicate spacing angular orientation affect initiation propagation, as well subsequent mechanisms. It also shown compared with spacing, has more significant UD composites under transverse tension. Results this work provide an experimental-based quantitative insight into mechanics using in-situ full-field measurements.