This paper studies the micromechanical progressive failure properties of glass fiber/phenolic resin composites by finite element analysis and experiments. First, a set of theoretical methods on the failure criteria and damage evolution of fiber, matrix, and interface are introduced, which include Monte Carlo simulation on random fiber fracture, damage evolution and stiffness degradation of matrix based on thermodynamic theory, an exponential cohesive model for interface debonding, and a strain localization-based Mori–Tanaka homogenization method. Second, the proposed model is implemented using ANSYS PARAMETRIC DESIGN LANGUAGE (ANSYS-APDL) that uses the restart numerical technique. In order to predict the tensile strength of the composites, the numerical convergence issue is solved by introducing viscous effect into the stiffness equations. Finally, numerical results in terms of the damage evolution behaviors and tensile strengths of composite microstructures are validated by tensile experiments and acoustic emission tests on unidirectional glass fiber/phenolic composites.
Random fiber breakage Cohesive model for interface debonding Matrix cracking and stiffness degradation Glass fiber/phenolic resin composites Finite element analysis (FEA)
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Dr. P.F. Liu would sincerely like to thank the support by the National Key Fundamental Research and Development Project of China (No. 2015CB057603), the National Natural Science Funding of China (No. 51375435), and Aerospace Science and Technology Innovation Funding (No. GFJG-112108-E81504).
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