CFRPのモードI層間はく離疲労き裂の進展に及ぼす繊維ブリッジングの影響

概要

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Growth behavior of mode I interlaminar cracks in two different carbon/epoxy laminates, Toray T800H/#3631 and T300/#3601, was studied under cyclic loading. Under a constant value of the applied stress intensity range, ΔK_<I ap>, the crack propagation rate decreased with crack extension for T800H/#3631 laminates, while the crack propagation rate was constant for T300/#3601 laminates. The deceleration of crack growth in the former material is caused by fiber bridging. For each laminate, the crack propagation rate was expressed by a power function of the crack-tip value of the stress intensity range, ΔK_<I tip>. The formation of fiber bridging strongly depends on the morphology of resin-rich layers between laminae. In T800H/#3631 laminates, the many fiber-rich regions disconnecting resin-rich layers are the origin of fiber bridging, while there is no such region in T300/# 3601 laminates having continuous resin-rich layers.
一般社団法人日本機械学会の論文
1995-03-25