長い溶接継手の3次元残留応力測定理論
A Measuring Theory of Three Dimensional Residual Stresses in Long Welded Joints

Yukio Ueda, Keiji Fukuda, Minoru Fukuda
1980 JOURNAL OF THE JAPAN WELDING SOCIETY  
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 the theory of inherent strains, which is based on one of these principles. First of all, the characteristic of the distribution of its inherent strains induced in a long welded joint is clarified. This characteristic makes the measuring theory simple. According to
more » ... resulting theory, three dimensional inherent strains can be divided into the components of inherent strains contained in a sliced thin vertical cross section (T-specimen) to the weld line and longitudinal inherent strains contained in sliced thin plates (Li-specimens) parallel to the direction of the weld line. 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 provide 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 triaxial residual stresses.
doi:10.2207/qjjws1943.49.845 fatcat:vhyd6tjgwvbcnlw4zcxolboura