信頼性に基づく繊維強化複合材料積層平板の最適設計

概要

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In this paper, the structural reliability theory is applied to multiaxial fiber-reinforced laminate systems. The first-ply-failure criterion is adopted for the reliability analysis of the laminate systems, and the multiple-check-point method is successfully applied to evaluate the reliabilities of biaxial, triaxial and tetraaxial laminates under the probabilistic in-plane stresses. The reliability-based optimum fiber orientation angles of multiaxial laminates are determined and compared with those under the deterministic conditions. Further, some effects of the random properties of loads and strengths are discussed. From the numerical results it is concluded that the optimum fiber orientation angles of laminates are very different between the deterministic and probabilistic conditions and that the reliability of the multiaxial laminates increases with the increase in the number of orientation axes under probabilistic conditions. As a result, the optimum laminates approach quasi-isotropic construction when the uncertainty in the stresses and strengths is taken into consideration.
一般社団法人日本機械学会の論文
1991-09-25