円板のはめ板溶接における残留応力 : 溶接残留応力および溶接変形の解析(第 3 報)

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As a second example of the applications of theoretical analysis of residual welding stresses based on the inherent strain, stress distributions in a finite circular plate with concentrically patch welded joint are calculated and compared with experimental results. In this report, the annular plastic region with finite width is considered to exist along the welded line corresponding to the patch welded joint. Both components of inherent strain ε_γ and ε_θ are assumed to be uniformly distributed along circumferential welded line. On this assumption the residual welding stresses in a patch welded circular plate are obtained as the inherent stresses caused by the inherent strain. Since the components of inherent strain are expressed as a function of only the variable γ, distance from the center of the circular plate, the results of the theory of axially symmetric inherent stresses presented in the first report can be applied in this case. In this report, taking the apparent elastic stress due to the 1mm displacement of root gap of patch welded joint as the restraint coefficient, the transverse shrinkage is estimated from the welding conditions and restraint coefficient as in the butt welded joint. The inherent shrinkage is considered to be approximately equal to the transverse shrinkage. In contrast to the case of slit-type butt welded joint, described in the second report, the residual stresses are calculated here without reference to the experimental results of transverse shrinkage. Nevertheless, the theoretical results well agree with the experimental ones as shown in Figs. 4 to 6. The calculation method mentioned above makes it possible to estimate the rough distribution of residual stresses caused by circular patch welded joint.
社団法人溶接学会の論文
1974-02-25

著者

藤本二男
鉄道技術研究所

円板のはめ板溶接における残留応力 : 溶接残留応力および溶接変形の解析(第 3 報)

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