Reliability-based Optimization of Laminated Composites Under Fuzzy ConstraintCHEN Jian-qiao,WEI Jun-hong,GE Rui(Department of Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China)The fuzzy reliability and fuzzy constraint were introduced in the reliability optimum design of laminated composites.By the aid of the fuzzy mathematic theory and the optimization methodology,a fuzzy reliability optimum design model and the corresponding computation method were developed in this paper.Since the proposed method took into consideration of many influence factors,the composite structures designed based on this method would be more consistent with the engineering practice command.fuzzy reliability;fuzzy constraint;fuzzy reliability optimum design;the best safety level