Measurement of Residual Stresses in a Cylinder : 2nd Report, Evaluation and Experiment on a Short Specimen Cut Off from a Long Cylinder

Abstract

On the basis of the analysis of his previous report, the author evaluates deformations in various specimens cut off from a long cylinder in which a given longitudinal residual stress exists. According to the present results, it appears that if ξ>2∼2.25 (ξ is the ratio of length to diameter of a specimen), we can use the equations introduced by Sachs with safety for determining the residual stresses, and if ξ<2, the distributions of the residual stresses computed from the Sachs equations are somewhat different from those in the original cylinder except for its outer half portion. Furthermore, the author shows that the agreement between the calculated result and the experimental is good, and proposes a method for determining approximately the distributions of residual stresses in the original long cylinder from the data with a short specimen (ξ>1.25).