室温におけるクロスプライCFRP積層板の非主軸疲労挙動とプライベース疲労解析(OS4-6 寿命(1),OS4 微視構造を有する材料の変形と破壊)

概要

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Off-axis fatigue behavior of a symmetric cross-ply carbon/epoxy laminate is examined and a fatigue life prediction method on a ply-by-ply basis is developed. First, tension-tension fatigue tests on off-axis specimens of the cross-ply laminate under constant amplitude cycling at room temperature are performed. The normalized off-axis S-N relationship for the cross-ply laminate using the fatigue strength ratio agrees with that for the unidirectional laminate made of the same prepreg tape. This indicates that the offaxis fatigue behavior of the cross-ply laminate is substantially governed by that of the unidirectional plies in the laminates. Second, under the assumption that the fatigue failure of the constituent plies embedded into the laminate is similar to that of the unidirectional laminates, 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 the cross-ply laminates is evaluated by comparing with experimental results.
一般社団法人日本機械学会の論文
2004-07-20