Plastic Deformation of Metals and the Octahedral Shearing Stress Theory (2nd Report)

Abstract

Two kinds of experimental repsults are reported. One of them is the experiments on plastic deformation of metals under three axial stresses. The cylindrical specimens of mild steel were deformed up to rapture by axial tensile force and external pressure. The more severely the specimens were compressed by external pressure, and by the lower tensile stress the specimens were deformed, and it has been recognized that the theory of octahedral shearing stress can be applied to plastic deformation under three axial stresses. Another experiments were carried out for the study of plastic deformation under two axial stress, where the stress ratio is variable. The relationship between octahedral shearing stress ratio, and these experimental results show that the deformation hysteresis should be taken into account for study of plasticity.