Abstract
Abstract A new theory of mobile dislocation density, in combination with experimental data on the variation of dislocation velocity with stress, is used in order to calculate the yield stress of crystals of a variety of metals and non-metals. The predicted values agree with the measured values usually to better than 10%. In the case of iron and tungsten, measured velocity curves for edge dislocations suggest a yield stress which is too low; estimated screw velocity data provide good agreement. The calculated velocity at yield varies by more than three orders of magnitude: for soft materials it is high, for hard materials low.
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