Fatigue-Seismic Ratcheting Interactions in Pressurized Elbows

[+] Author and Article Information
Dj. Boussaa, K. Dang Van

Laboratoire de Mécanique des Solides, Centre commun X-Mines-Ponts-CNRS, URA 317, École Polytechnique, Palaiseau, France

P. Labbé

Service Études et Projects Thermiques et Nucléaires, Électricité de France, Villeurbanne, France

H. T. Tang

Nuclear Power Division, Electric Power Research Institute, Palo Alto, CA 94303

J. Pressure Vessel Technol 116(4), 396-402 (Nov 01, 1994) (7 pages) doi:10.1115/1.2929607 History: Received October 14, 1993; Revised April 08, 1994; Online June 17, 2008


Three dynamic tests on pressurized elbows involving fatigue-ratcheting as the major failure mode are investigated. The fatigue analysis is carried out with two approaches: the first is global and consists of Markl’s equation; the second is local and is based on local fatigue criteria combined with a suggestion by Coffin to take ratcheting into account. The implementation of these approaches required some elementary signal processing to separate the cyclic part of the strain from ratcheting. Results on narrow-band processes were used to assess cumulative damage. Finite element computations extended the data into uninstrumented locations. The great sensitivity of the implemented criteria to their arguments is discussed and exemplified. Despite the complexities of the issue, computed results match well with the experimental data.

Copyright © 1994 by The American Society of Mechanical Engineers
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