13. A Research on Welding Deformation of Spherical Shell Structures (2nd report) : Study on reducing methods of welding deflections

概要

論文の詳細を見る
Welding deformations and residual stresses are major factors which affect the collapse strength of externally pressurized vessels. Deflections in spherical shell welded along the equator have been reported by some of the authors. In many actual structures, a penetrator is welded circumferentially to a spherical shell. In these cases, the spherical shell near the weld line and the penetrator tend to sink inward. In the previous report, the deformation of spherical shell caused by the welding of penetrator was investigated. Experiments were carried out in order to clarify the characteristics of welding deformation under the effects of shell and penetrator dimensions and welding procedures. One-dimensional thermal elasto-plastic analysis using Rayleigh-Ritz method was carried out to solve this problem theoretically. In this report, methods of reducing the welding deformations in spherical shell structures are discussed. Some deflection control methods are considered based on the results obtained in the previous report. It is proved by experiments that the "thermal-shrink fit method" is effective to produce initial reverse deflection and the "restraint load method" is more effective to reduce welding deflections. The welding deformations in spherical shells can be prevented almost perfectly by controlling the restraint load together with adopting the initial reverse deflection, and the effectiveness of this proposed method is confirmed by experiments.
社団法人日本船舶海洋工学会の論文

13. A Research on Welding Deformation of Spherical Shell Structures (2nd report) : Study on reducing methods of welding deflections

スポンサーリンク

概要

著者

関連論文

スポンサーリンク