New concept of equivalent inherent strain for measuring axisymmetric residual stresses

A new concept, the equivalent inherent strain g(0)(eq), is proposed for mea suring axisymmetric residual stresses, based on the inherent strain theory. g(0)(eq) is a parameter obtained by incorporating the radial inherent stra in component into the tangential inherent strain component in computing the axially uniform axisymmetric residual stresses. The application of this co ncept ran avoid the restriction of radial inherent strain component estimat ion and hence leads to a more simple and accurate method for measuring axis ymmetric residual stresses. Experimental measurement and numerical simulati on were carried our to demonstrate that this method has both the simplicity of the Sachs method and the high accuracy of the inherent strain method