Analysis of Pipe Bends With Symmetrical Noncircular Cross Sections

[+] Author and Article Information
J. F. Whatham

Australian Atomic Energy Commission, Research Establishment, Sutherland, NSW, 2232, Australia

J. Appl. Mech 54(3), 604-610 (Sep 01, 1987) (7 pages) doi:10.1115/1.3173076 History: Received August 05, 1986; Revised February 19, 1987; Online July 21, 2009


A thin shell analysis is presented for pipe bends with symmetric noncircular cross sections under in-plane bending or internal pressure, using the static-geometric analogy and neglecting end effects. Any symmetric shape is possible but the analysis mainly concerns cross sections with double symmetry; an investigation of two-lobe (oval) and four-lobe cross sections demonstrates that pipe bend flexibility is almost inversely proportional to flank radius if the pipe wall is thin. Pressurizing a pipe bend of oval cross section produces a similar hoop stress distribution to that of a bending moment straightening the pipe.

Copyright © 1987 by ASME
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