Abstract
Localized plastic strains within individual surface grains in aluminum alloy 2219-T851 were measured, using a reference gauge technique, at intervals during fatigue. Consistent with contemporary hypotheses regarding the fracture of constituent particles, we found that critical values of localized plasticity led to particle fracture; however, we also found that cyclic hardening of the surface reduced the rate of accumulation of plasticity from that predicted by previous models. Consequently, fewer numbers of particles were found to fracture in aluminum alloy 2219-T851 during fatigue at low stress amplitudes than theories predict. Various methods to incorporate the cyclic hardening of the surface into a particle fracture model are discussed. One such model is used successfully to predict the reduced number of constituent particles in aluminum alloy 2219-T851 that fracture in specimens which are first conditioned by pre-fatigue at a low cyclic stress amplitude and compared with unconditioned specimens when both are cycled at higher cyclic stress amplitudes.
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