Prediction method of longitudinal tensile strength for unidirectional composites with interphase

Based on the traditional shear-lag model, using hierarchical multi-scale approach to research the tensile strength of fiber-reinforced composite. In this method, the tensile strength of carbon fibers is described by Weibull function, and a Monte-Carlo progressive failure model is established to analyze the longitudinal tensile strength of unidirectional composite materials, and we use this model to analyze the influence of micro parameter on the macro properties of fiber-reinforced composites, such as thermal residual stress and strength of interphase. The model can be used to predict macro-performance of fiber-reinforced composites and can give a reference for composite design and optimization.