Plastic Deformation of Metals and the Octahedral Shearing Stress Theory (3rd Report)

Abstract

The anisotropic behavior in plastic deformation of the metal under two dimentional stress was studied sxperimentally, where stress ratio varied discontinuously during deformation. For example, the relationship between stress components and strain components was measured and the octahedral shearing stress strain curve was calculated from the tension test under the constant pressure 100kg/cm² on a thin-walled tube of steel, which had been previously deformed under tensile force and the constant pressure 44kg/cm². The conclusions are that the real material deforms, after sudden variation of stress ratio, just as ideal isotropic material would deform when the stress ratio varied a little more, and that the abrupt lowering of stress strain curve corresponds to discontinuity of stress ratio.