円筒殼と鏡板の円周溶接による溶接変形ならびに残留応力

概要

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The residual stresses and deformations due to circumferential welds of cylindrical or spherical shells are one of the most important problems concerning to stress corrosion cracking and collapse strength of pipe structures or pressure vessels. It is well known that the state of stress in butt-welded cylinder or sphere may quite different from that in butt-welded flat plate. This is because not only hoop stress but also bending stress in longitudinal direction is produced. This bending stress is induced due to the radial displacement caused by circumferential shrinkage of weld. In this paper, welding deformations and residual stresses due to circumferential welds at the joint between cylindrical drum and hemispherical head plate is researched. One dimensional thermal elastoplastic analysis using Rayleigh-Ritz method is applied to the axi-symmetric thermal stress problems of comparatively thin cylindrical and spherical shells. The following conclusions are obtained. 1) The influence of dimensions of shell and welding heat input on welding deformations and residual stresses can be described by means of the parameter (Q/h)β. 2) The effectiveness of the proposed design charts of the deformations and residual stresses for a given shell is confirmed by comparing the estimated values with the experimental results.
社団法人溶接学会の論文
1981-08-05