Inner and Outer Cracks in Internally Pressurized Cylinders

[+] Author and Article Information
A. S. Kobayashi, N. Polvanich, A. F. Emery, W. J. Love

University of Washington, Department of Mechanical Engineering, Seattle, Washington

J. Pressure Vessel Technol 99(1), 83-89 (Feb 01, 1977) (7 pages) doi:10.1115/1.3454523 History: Received May 06, 1976; Online October 25, 2010


Stress intensity factors of pressurized surface cracks at the internal surface and un-pressurized surface cracks at the external surface of an internally pressurized cylinder are estimated from stress intensity factors of a semi-elliptical crack in a finite-thickness flat plate. Curvature effects of the cylinder are determined by comparing two-dimensional finite element solutions of fixed-grip, single edge-notched plates and single edge-notched cylinders. Stress intensity factors for semi-elliptical cracks with crack aspect ratios of b/a = 0.2 and 0.98 at crack depths up to 80 percent of the cylindrical wall thickness are shown for internally pressurized cylinders with outer to inner diameter ratios, Ro /Ri , ranging from 10:9 to 5:4 for outer surface cracks and to 3:2 for inner surface cracks.

Copyright © 1977 by ASME
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