Fatigue and Creep-Fatigue Life Evaluation of U-Shaped Bellows

[+] Author and Article Information
K. Tsukimori, T. Yamashita, M. Kikuchi, K. Iwata, A. Imazu

O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation, Ibaraki-ken, Japan

J. Pressure Vessel Technol 114(3), 280-291 (Aug 01, 1992) (12 pages) doi:10.1115/1.2929042 History: Received May 21, 1991; Revised February 26, 1992; Online June 17, 2008


For the reliable operation of bellows under cyclic loadings at high temperatures, a rational evaluation method of life of bellows would be needed. Authors investigated simplified analysis methods for fatigue and creep-fatigue life prediction of U-shaped bellows considering inelasticity as well as various geometrical nonuniformity such as thickness and shape of convolutions. A conservative evaluation method of the strain range is developed, introducing three strain range amplification factors for nominal elastic strain range. Creep and relaxation behaviors of bellows are studied. Consequently, a new evaluation method of creep damage fractions is proposed which depends upon the relation between primary and secondary stresses. Fatigue and creep-fatigue tests are conducted and the validity of the present methods is discussed.

Copyright © 1992 by The American Society of Mechanical Engineers
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