Flexibility and Stress Factors of Pipe Bends—An Analysis by the Finite Ring Method

[+] Author and Article Information
H. Ohtsubo, O. Watanabe

Department of Naval Architecture, University of Tokyo, Bunkyo-ku, Tokyo, Japan

J. Pressure Vessel Technol 99(2), 281-290 (May 01, 1977) (10 pages) doi:10.1115/1.3454533 History: Received June 07, 1976; Online October 25, 2010


The present paper investigates the flexibility and stress factors for the pipe bends when they are connected with straight pipes and subjected to out-of-plane as well as in-plane bending moments, to which the conventional methods are not directly applicable. The stress analysis is carried out by the use of a new finite ring element method which is based on the general thin shell theory incorporating shear strain. The numerical results obtained for flexibility and stress factors are compared with the code formula. The influence of initial deflections and the variation of the pipe wall thickness is also studied.

Copyright © 1977 by ASME
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