Effects of Residual Stress on Fatigue Strength of Small-Diameter Welded Pipe Joint

[+] Author and Article Information
T. Yamashita, T. Hattori

Takasago R&D Center, Mitsubishi Heavy Industries, Ltd., 2-1-1, Shinhama, 2-Chome, Arai-cho, Takasago, Hyogo Pref., 676 Japan

K. Iida

Department of Mechanical Engineering, Sibaura Institute of Technology, Shibaura, Minato-ku, Tokyo, Japan

T. Nomoto

Department of Naval Architecture and Ocean Engineering, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan

M. Sato

Welding Engineering Department, Japan Power Engineering and Inspection Corporation, Akasaka, Minato-ku, Tokyo, Japan

J. Pressure Vessel Technol 119(4), 428-434 (Nov 01, 1997) (7 pages) doi:10.1115/1.2842326 History: Received September 17, 1996; Revised June 06, 1997; Online February 11, 2008


Bending fatigue tests were conducted to investigate the fatigue strength of small-diameter socket welded pipe joints. In 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 the 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.

Copyright © 1997 by The American Society of Mechanical Engineers
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