Abstract
The effect of dislocation substructures on fatigue is explored within the following categories: a) the dislocation substructures produced by cycling in annealed material and the effect of cycling on substructures introduced extraneously before cycling; b) hight and low strain fatigue fracture, expressed in terms of Coffin-manson or stress-life plots; and c) the effect of substructure on the mechanisms of crack nucleation and propagation. Usually, cycling is very effective in rearranging substructures introduced extraneously, especially at high strains. Consequently, there is little effect of the substructures on fatigue fracture except under some circumstances at low strains, and also if the agent of introducing the initial substructures has had an effect on the fracture process, for example, by opening cracks at inclusions. Dislocation substructure, however formed, is not significant,per se, to fatigue fracture except in acting as a source of plastic deformation.
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