Effects of residual stress on fatigue strength of small diameter welded pipe joint
- Mitsubishi Heavy Industries, Ltd., Takasago (Japan). Takasago R and D Center
- Univ. of Tokyo (Japan). Dept. of Naval Architecture and Ocean Engineering
- Sibaura Inst. of Tech., Tokyo (Japan). Dept. of Mechanical Engineering
- Japan Power Engineering and Inspection Corp., Tokyo (Japan). Welding Engineering Dept.
A power plant consists of many welded components, therefore, it is essential in establishing the reliability of the power plant to maintain the reliability of all welded components. The fatigue failure caused by mechanical vibrations of small diameter welded joints, which is represented by socket welded joints, is one of the major causes of trouble for the welded parts of the power plant. Here, bending fatigue tests were conducted to investigate the fatigue strength of small diameter socket welded pipe joints. In the most cases of large diameter socket joints, a fatigue crack started from the root of the fillet weld though the stress amplitude at the root was smaller than that at the toe of fillet weld. Additionally, the fatigue strength was affected by the weld bead sequence. The residual stress was considered to be one of the important parameters governing fatigue strength, therefore, its effects were investigated. In several types of pipe joints, the local stress and residual stress distributions were calculated by finite element analysis. The residual stresses were compressive at the toe and tensile at the root of the socket welded joints. Based on these results, the effects of residual stresses on the fatigue strength are discussed for small diameter welded pipe joints in the present work.
- OSTI ID:
- 403197
- Report Number(s):
- CONF-960706-; ISBN 0-7918-1774-1; TRN: 97:000154
- Resource Relation:
- Conference: American Society of Mechanical Engineers (ASME) pressure vessels and piping conference, Montreal (Canada), 21-26 Jul 1996; Other Information: PBD: 1996; Related Information: Is Part Of Residual stresses in design, fabrication, assessment and repair. PVP-Volume 327; Warke, R.W. [ed.] [Edison Welding Inst., Columbus, OH (United States)]; Dong, P. [ed.] [Battelle Memorial Inst., Columbus, OH (United States)]; Dermenjian, A. [ed.] [Sargent and Lundy, Chicago, IL (United States)]; PB: 207 p.
- Country of Publication:
- United States
- Language:
- English
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