Influence of Intermediate Principal Stress on Plastic Flow

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.