14. Method of Thermal Elasto-Plastic Analysis (4th Report) : Part 4. Deformations and Residual Stresses in Butt-welded Pipes and Spheres

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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 stress corrosion cracking and collapse strength of pipe structures or pressure vessels. Recently, many researches have been carried out in Japan with regard to these problems. It is well known that the state of stress in butt-welded cylinder or sphere may be quite different from that in butt-welded flat plate. This is because not only hoop stress but also bending stress in the longitudinal direction is produced. This bending stress is induced due to the radial displacement caused by circumferential shrinkage of weld. In this paper, one dimensional thermal elasto-plastic analysis using Rayleigh-Ritz method is applied to the axi-symmetric thermal stress problems of comparatively thin cylindrical or spherical shells. It is clarified that the adoption of proper displacement function, which satisfies the geometrical boundary conditions, gives more accurate solution compared with those by the finite element method even in case of smaller degree of freedom. The following conclusions are obtained; 1) The effectiveness of present analytical method and the reliability of its results are confirmed by comparing the calculated values with the experimental results. 2) 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. 3) The proposed design charts of deformations and residual stresses for a given shell are proved to be available for design purposes.

• 社団法人日本船舶海洋工学会の論文

著者

• Fujita Yuzuru

  University Of Tokyo

• Fujita Yuzuru

  Faculty Of Engineering Tokyo University

• Hasegawa Hisao

  Kawasaki Heavy Industries Ltd. Welding Research Laboratory

• NOMOTO Toshiharu

  University of Tokyo

関連論文

• Prevention of End Cracking in One-Side Automatic Welding
• 9. Prevention of End Cracking in One-Side Automatic Welding : Numerical Analysis of Transient Phenomena in Welding
• 13. A Research on Welding Deformation of Spherical Shell Structures
• 13. A Research on Welding Deformation of Spherical Shell Structures (2nd report) : Study on reducing methods of welding deflections
• Welding Deformation and Residual Stress due to Circumferential Welds at the Joint between Cylindrical Drum and Hemispherical Head Plate
• 14. Method of Thermal Elasto-Plastic Analysis (4th Report) : Part 4. Deformations and Residual Stresses in Butt-welded Pipes and Spheres
• 13. Method of Thermal Elastic-Plastic Analysis : Part 3 Thermal Stress Analysis based on Initial Strain Method
• 1. Plastic Design in Steel Structures (5th Report) : Studies on Plastic Design of the Bipod-Type Masts
• 10. Method of Thermal Elastic-Plastic Analysis : Part 2 Thermal Stress Analysis based on Inherent Strain
• 10. Method of Thermal Elastic-Plastic Analysis : Part 1 Thermal Stress Analysis based on Finite Element Method
• 9. On the Strength of Structures with Imperfections

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