Dynamic Stability of Pipes Under Jet Forces From a Circumferential Through-Crack

[+] Author and Article Information
R. P. Keskinen

Finnish Centre for Radiation and Nuclear Safety, Helsinki, Finland

J. Pressure Vessel Technol 109(3), 329-335 (Aug 01, 1987) (7 pages) doi:10.1115/1.3264873 History: Received January 08, 1986; Revised August 01, 1986; Online November 05, 2009


An investigation is made into the dynamic stability of a pipe with a postulated circumferential through-crack. The dynamic deformation of the pipe is found to control the ensuing jet force in such a manner that positive or negative damping results, depending on the local mode shape geometry. The leak is governed by quasi-steady fluid dynamics, which permits a simple closed-form evaluation of the damping energy for a crack geometry idealized from existing LEFM solutions. Energy losses develop via structural damping and plastic dissipation at the crack tip; the latter is estimated using the Irwin’s plastic zone correction approach. Application to a PWR plant primary circuit piping suggests that structural damping in practice rules out the instability.

Copyright © 1987 by ASME
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