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RESEARCH PAPERS

Steady-State Crack Propagation in Pressurized Pipelines Without Backfill

[+] Author and Article Information
M. F. Kanninen, S. G. Sampath

Battelle Columbus Laboratories, Columbus, Ohio

C. Popelar

The Ohio State University, Columbus, Ohio

J. Pressure Vessel Technol 98(1), 56-64 (Feb 01, 1976) (9 pages) doi:10.1115/1.3454326 History: Received March 31, 1975; Online October 25, 2010

Abstract

In a previous paper, a simplified dynamic-shell theory representation was formulated for steady-state motion in a pipeline without backfill. The present work extends this model by (1) incorporating a gas dynamics treatment to determine the axial variation in the pressure exerted by the gas on the pipe walls, and (2) incorporating a plastic yield hinge behind the crack tip. Solutions to the governing dynamic equations are obtained for these conditions and used to calculate the steady-state dynamic energy release rate as a function of crack speed. In the single full-scale experiment in which an independent estimate of the dynamic fracture energy is available for a pipe without backfill, the model predicts a steady-state speed of 780 fps. This can be compared with measured speeds which ranged from 725 to 830 fps in the test. Because the calculated steady-state dynamic energy release rate exhibits a maximum, it is suggested that this approach may offer a basis for crack arrest design of pipelines.

Copyright © 1976 by ASME
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