CFRP積層板の引張疲労強度

概要

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Tensile fatigue properties of three types of composite laminates were examined. Stacking sequences of laminates were [0/90/+45/-45]_s, [+45/0/-45/90]_s and [0/90_2]_s. Modulus reduction during the experiments was measured and delamination growth was investigated. Interlaminar stresses along the free edge were calculated by the finite-element method and the stress distributions were compared with experimental results. Test results revealed that the unnotched and the notched specimens had almost the same fatigue strength properties. Modulus reduction with respect to the initial value for [+45/0/-45/90]_s laminates was about l0%,whereas [0/90/+45/-45]_s and [0/902]_s laminates showed no change from the initial modulus. This modulus reduction for [+45/0/-45/90]_s laminates was observed at the first l0%~20% of failure life and it was mainly due to free edge delamination. Interlaminar stresses were predominant in free edge delamination and fairly enabled to infer delamination onset interfaces.
社団法人日本機械学会の論文
1992-06-25