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RESEARCH PAPERS

Inelastic Flexibility and Strain Concentration of Pipe Bends in Creep Range with Plastic Effects

[+] Author and Article Information
O. Watanabe

Institute of Structural Engineering, University of Tsukuba, Sakura, Ibaraki, Japan

H. Ohtsubo

Department of Naval Architecture, University of Tokyo, Hongo, Tokyo, Japan

J. Pressure Vessel Technol 102(3), 271-277 (Aug 01, 1980) (7 pages) doi:10.1115/1.3263331 History: Received December 17, 1979; Online November 05, 2009

Abstract

The creep behaviors of pipe bends under in-plane bending are studied by the use of the simplified ring element method. The typical two loading cases are studied; (a) constant in-plane moment, and (b) constant in-plane rotation. The present paper investigates (a) inelastic flexibility, (b) creep strain concentration, and (c) stress relaxation by considering effects of yielding on creep deformations. The numerical results verify the validity of the previous analytical methods for elastic stationary creep behaviors by Spence or Kachanov.

Copyright © 1980 by ASME
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