Fuzzy Reliability of Fiber Reinforced Composite Laminate
Wei Junhong,Chen Jianqiao
(Department of Mechanics, Huazhong University of Science and Technology Wuhan 430074, China)

Abstract: The performances of constitutive materials, laminate structures, mater ial components and load conditions etc., can greatly influene the strength behav iors of the Fiber Reinforced Plastics (FRP) composites, accompanying many uncert ain factors. The previous researches scarecely considered both the random and fuzzy variables in the reliability analysis. A fuzzy reliability model for FRP lam inates is established where the loads are taken as the random variables and the strengths as fuzzy variables. And a numerical model is developed to calculate the fuzzy reliability of a laminate. Monte Carlo simulation method is utilized to compute the reliability of laminas combined with the maximal stress criterion. The system reliability is evaluated based on the first-ply failure criterion, which illustrates the validity and efficciency of the proposed method.
Keywords: fuzzy reliability, the maximum-stress criterion, first-ply failure criterion, composite material, simulation method.