切欠きを有する連続ガラス繊維強化エポキシ積層材の疲労損傷とその進展に与える積層形態の影響

概要

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Fatigue damage processes of continuous E-glass-fiber-reinforced epoxy laminates under tension-tension fatigue were compared between plain-weave roving fabric, cross-ply and quasi-isotropic laminates. The fatigue tests were performed for double-edge-notched parallel-plate specimens. The damage area was photographed at appropriate intervals, together with the measurement of compliance. For the unwoven unidirectional-ply laminates (the cross-ply and quasi-isotropic laminates), the damaged zones grew progressively in the form of delamination, fiber splitting and matrix cracking, and their shapes were characteristic of the ply configuration. The woven fabric laminate, on the other hand, was deteriorated by propagation of a single crack emanating from the notches, and the damaged zone was concentrated in the vicinity of the crack surface. An almost linear relation-ship between the delamination area and the compliance was observed. The rates of delamination and the characteristic delamination length for the unidirectional-ply laminates correlated well with the compliance in a power-law relation.
1994-09-25