Abstract
The impact fatigue test was carried out on an epoxy resin filled with Si02 particles. The effect of the Si02 content ratio on the impact fatigue strength and the effect of the impact repeating speed and the life to failure on fracture surface morphology were examined. The impact fatigue strengthσt can be estimated by the formula of σt (NfTe)mt =Dt, where NfTe. is the cumulative duration time, and mt and Dt are parameters of the impact fatigue properties. The impact fatigue strength and static strength were governed by the content ratio of the Si02 particles. The crack initiated by decohesion at the epoxy-Si02 interface and the stable crack grew along this interface under the monotonic and the impact repeated loading conditions. During the unstable fracture, however, the crack propagated regardless of the existence of the Si02 particles.
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