Abstract
An optimum design methodology based on reliability for a composite structural system has been developed. In this method a two-level optimization technique is adopted. In system level optimization the structural total weight is taken as the design objective, and the requirement of system reliability is the constraint; in member level optimization the laminate reliability is taken as the design objective, and keeping the weight or thickness of laminate unvarying is the constraint. The corresponding optimal criteria and iterative formulae are derived. An illustrative example explains that this method is quite efficient and can be applied to large scale composite structures.
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