Abstract
Let σ1, σ2 and σ3 (σ1>σ2>σ3) be the principal stresses, and σ3=0. Taking σ1 and σ2 as the axes, the criterion of plastic flow is not expressed by a smooth curve by the authors' theory, but a curve composed of two straight lines which intersect at σ1=4σ2 in the range between tension and pure shear. Experiments were carried out. The results show that there is an abrupt bent as expected according to the authors' theory.
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