A Measuring Theory of Three Dimensional Residual Stresses in Long Welded Joints : L_y Method and L_Z Method(Welding Mechanics, Strength & Design)

概要

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Two of the authors have already proposed the general principles for measurement of residual stresses. In this paper, the authors develop a new measuring theory of three dimensional residual stresses in a long welded joint by using effective inherent strains as parameters, which is based on one of these principles. First of all, the characteristic of the inherent strain distribution induced in a long welded joint is clarified. This characteristic makes the measuring theory simple. Then, the measurement of three dimensional welding residual stresses in a very thick plate has become practically possible. When residual stress distributions are uniform along the weld line, the theory should assure the exact measured ones. By this developed theory, the distributions of residual stresses in an electroslag welded joint are measured for the first time. And the estimated residual stresses show a fairly good coincidence with the directly observed stresses on its surfaces. It can be concluded that the present theory is reliable and practically applicable to measure such complex three dimensional residual stresses.
大阪大学の論文