New Measuring Method of Three Dimensional Residual Stresses Based on Theory of Inherent Strain(Welding Mechanics, Strength & Design)

概要

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The authors have already proposed the general principles in measurement of residual stresses. In this paper, the authors present a new measuring method of three dimensional residual stresses based on the principle which is simplified by utilizing the characteristics of the distribution of inherent strains induced in a long welded joint. According to this theory, three dimensional inherent strains can be divided into two sets of the components ; one set of components is contained in a cross section parpendicular to the weld line and the other is the longitudinal component which is parallel to the weld line. Taking advantage of this characteristics, stresses induced by the two sets of components of the inherent strains can be estimated separately and as the summation of these stresses the measurement of three dimensional welding residual stresses has become practically possible. With the support of the rational theory, the distributions of residual stresses and longitudinal inherent strains in a multipass welded joint have been measured for the first time. And the estimated residual stresses show a good coincidence with the directly observed stresses on the surfaces of the joint. This implies that the present theory is reliable and applicable to measure such complex internal residual stresses.
大阪大学の論文