A theory for ductile fracture in a material with a strain-rate-sensitive yield stress is proposed, based on the hypothesis that fracture is the result of internal necking between adjacent microscopic cavities. The theory is developed for a plane-strain element containing uniformly distributed cavities and this model is used to examine the effects of strain-rate-sensitivity on the strain to fracture in ductile materials. The results suggest possible explanations for both “blue-brittleness” behaviour and the “superplasticity” effect.
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