Plastic Collapse of Oval Straight Tubes Under External Pressure

[+] Author and Article Information
N. C. Small

University of South Florida, Department of Structures, Materials and Fluids, Tampa, Fla.

J. Pressure Vessel Technol 100(1), 46-51 (Feb 01, 1978) (6 pages) doi:10.1115/1.3454433 History: Received June 17, 1977; Online October 25, 2010


Experimental and theoretical results are presented for the collapse pressure of long straight slightly oval Inconel tubes under external pressure with dimensions used in heat exchangers for nuclear power plants. Since the tubes are in the thick-walled category, plastic effects are significant. Plastic limit analysis methods are utilized to obtain an expression for the collapse pressure which is exact for the idealized tube and which correlates well with the test data. The expected imperfection sensitivity is displayed by the significant drop of the collapse pressure for small increases in ovality.

Copyright © 1978 by ASME
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