Abstract
Studying the plastic flow of polycrystalline metallic wires under constant tensile stress, Andrade1 showed that, after an instantaneous extension accompanying loading, the flow could be separated into two components: (1) β-flow, characterized by γ α t1/3, where γ is the strain and t the time, and (2) a flow, described as viscous, obeying the law γ α t. It was thus found that the extension could be expressed generally by the equation,
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