複合材料積層板の信頼性に基づく最適設計への積層パラメータの適用

概要

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In this paper, the two types of the reliability-based design of a laminated composite plate subject to in-plane loads are formulated in terms of lamination parameters to improve the calculation efficiency. One is the reliability-maximized design of the constant-thickness plate. The other is the thickness-minimized design under the reliability constraint. The first ply failure (FPF) criterion is adopted as the plate failure, so that the laminated plate system is modeled as a series system consisting of each ply failure. The ply reliability is evaluated by the first order reliability method (FORM), where the material properties and applied loads are treated as random variables. Then, the system reliability is approximated by Ditlevsens bounds. Through numerical calculations, it is demonstrated that the reliability is distributed smoothly in the lamination parameter space and that a quick convergence is achieved in the reliability-based optimization.
社団法人日本機械学会の論文
2002-12-25