クロスプライCFRP積層板の室温および高温における主軸疲労強度とそのモデル化

概要

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Fatigue life prediction of a symmetric cross-ply carbon/epoxy laminate subjected to cyclic loading in the 0° fiber direction is attempted on a ply-by-ply basis. First, tension-tension ftigue tests on the cross-ply laminate under constant amplitude cycling at room and high temperatures are performed. The normalized S-N relationship for the cross-ply laminate using the fatigue strength ratio agrees well with that for the unidirectional laminate made of the same prepreg tape. This indicates that the fatigue behavior of the cross-ply laminate in the fiber direction is substantially governed by that of the constituent 0° plies in the laminate. Second, under the assumption that the final failure of the laminate is determined by the failure of the 0° plies, a simple fatigue failure model for the cross-ply laminate is developed on the basis of the classical lamination theory and the ply fatigue model considering the in-situ static strengths. Finally, validity of the proposed fatigue model for multidirectional laminates is evaluated by comparing with experimental results. It is demonstrated that the proposed fatigue model with a consideration of the in situ strength of ply succeeds in adequately predicting the fatigue strength of the symmetric cross-ply laminate for the fiber direction.
一般社団法人日本機械学会の論文
2005-03-25