Abstract
The Neuber's rule proposed by H. Neuber in 1961 states that the geometrical mean value of the stress and strain concentration factors at any stress-strain law is equal to the corresponding elastic stress concentration factor, even after the occurrence of local yielding. It was derived by a theoretical analysis of the stress concentration for the shear-strained prismatical bodies with arbitrary nonlinear stress-strain law. But up to now, it is extended to the two or three dimensional states of tensile stress and used for the study of low cycle fatigue without sufficient verification. In this paper, the present authors investigate the behavior of above mentioned two concentration factors by means of photoelastic coating method for metallic strip specimens with notches at both sides under uniaxial tension, and report so called Neuber's rule is not applied generally to the state of plane stress.
