Abstract
Recent work has shown that cyclic straining induces well-defined dislocation structures in ductile crystals. The structures seem to result from the cross-slip of screw dislocations and from the mutual trapping of edge dislocations. A brief review is given of recent experimental work on these structures, and an attempt is made to explain them in terms of dislocations. There is a pattern of long-range internal stress associated with the structures, and the significance of this for crack nucleation is stressed. It seems possible that the fatigue endurance limit of metals is the stress level above which screw dislocations on different slip planes cross-slip and annihilate each other rather than trap each other without annihilation.
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