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At the yield stress of a crystal its behavior suddenly changes from elastic to plastic; in other words, the plastic strain rate suddenly becomes finite and sometimes quite large. In terms of dislocation movements the plastic strain-rate, ˙γ, depends on the Burgers vector, b, of the dislocations in the crystal, the average velocity of the dislocation motions,
Gilman, J. J.
Brown University, Providence, R. I.