クロスプライCFRP積層板の室温における非主軸疲労挙動とプライベース疲労解析

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 are performed on off-axis specimens of the cross-ply laminate under constant amplitude cycling at room temperatures. 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 off-axis fatigue behavior of the cross-ply laminate is substantially governed by that of the constituent plies in the laminate. Second, on the assumption that the fatigue failure of the constituent plies in the laminate is similar to that of the unidirectional laminates, a simple fatigue failure model for the cross-ply laminate is developed by means 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 off-axis fatigue lives of the symmetric cross-ply laminate is successfully described using the proposed fatigue model with a consideration of the in-situ strength of ply.
一般社団法人日本機械学会の論文
2005-07-25