Abstract
The effect of a water environment on the near-threshold growth of delamination fatigue cracks was investigated with unidirectional laminates made from Ciba Geigy prepregs 914C (T300/914) and from Toray prepregs P305 (T300/#2500). Tests were carried out under mode I opening loading using double cantilever beam specimens. The crack growth rate was correlated to the equivalent stress intensity range without respect to the stress ratio. For 914C laminate, the crack growth rate in water was about one tenth of that in air in the power-law region. For P305 laminate, the effect of a water environment was small in the power-law region. Near the threshold, the crack grew slower in water than in air for both laminates. When the 914C laminate specimen was moisture-conditioned, the rate in water was about 300 times faster than that for the specimen in water without conditioning. These environmental effects were explained on the bases of fractography and fracture mechanisms.
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