Based upon micromechanical analysis of multiple damage events, a 2D theoretical model has been proposed to study tensile mechanical response of fiber-reinforced polymer composites, by considering the effect of statistic variations in fiber strength and shear failure of matrix. Stress profiles for any configuration of breaks in composites are derived by a superposition method under the framework of shear-lag arguments. A simulation scheme coupled with Monte-Carlo method has been executed to simulate progressive damage and to investigate failure behavior. Results show that the ultimate strength of composites is influenced by fiber strength statistics and stress distribution due to progressive microdamage.
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