Possible dislocation gating mechanisms for fatigue extrusion

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Abstract
Cross-slip now appears to be an important factor in the initiation of fatigue Cracks, and this lends support to the Mott screw-cycling model. The reason for progressive unidirectional cycling of the required kind under alternating stress is, however, not easily understandable. Two possible gating mechanisms are here proposed to account for this effect, both of which involve interactions with Lomer-Cottrell barriers. One of these mechanisms can provide an explanation for the very rapid appearance of extrusions in a few cycles of stress, and does not require any initial internal void to exist, as does Mott's original model.

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