多方向積層板の強度特性と最適設計

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This paper deals with the study of strength characteristics and the ply-thickness optimization of multidirectional fiber-reinforced composite plates. Laminates are assumed to be symmetric about the midplane surface and to consist of plies with 0, 90, 45 and -45 degree fiber orientations. A simple transformation was introduced to normalize the loading date and express all of them in the closed tress region. Personal computer programs were prepared to find the optimal combination of a maximum of four ply groups to obtain the maximum strength for a given set of in-plane stresses. Strength discontinuities of multidirectional laminate were considered in the process of optimization. The numerical results obtained using T300/5208 graphite/epoxy comosites showed the highest point, the strength of optimized laminate, to be about six times as high as that of the quasi-isotropic one. Ply thickness ratios of optimized laminate were also found to have many transition points in the tension-dominated region.
一般社団法人日本機械学会の論文
1989-08-25