Abstract
Impact fatigue tests were carried out on epoxy resin filled with SiO 2 particles. The effects of the percentage of SiO 2 particles and the impact cyclic loading frequency on the impact fatigue strength was investigated. The micromechanism of impact fatigue failure was examined and correlated with the morphology of the fracture surface. The impact stress amplitude, σ t , can be estimated by the formula, σ 2(N f · Te) mt = D t where ( N f· Te) is the cumulative duration time, and mt and D t , are parameters describing impact fatigue characteristics. The impact fatigue strength and the static strength are governed by the percent of SiO 2 particles. Crack initiation under monotonie cyclic impact loading was attributed to decision of the epoxy-SiO 2 interface. Unstable crack propagation occurs when the crack passes through the SiO 2 particles.
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