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RESEARCH PAPERS

Stress Intensity Factors for a Radially Multicracked Partially Autofrettaged Pressurized Thick-Walled Cylinder

[+] Author and Article Information
M. Perl

Florida International University, Miami, Fla. 33199

R. Aroné

Israel Institute of Metals, Technion Israel Institute of Technology, Haifa, Israel

J. Pressure Vessel Technol 110(2), 147-154 (May 01, 1988) (8 pages) doi:10.1115/1.3265579 History: Received August 24, 1987; Online November 05, 2009

Abstract

Mode I stress intensity factors for crack arrays of up to 1024 equal radial cracks originating at the inner surface of a partially autofrettaged, pressurized thick-walled cylinder are evaluated. Both stress intensity factors i.e., K Ip due to the pressurization, and the negative K IA due to the compressive residual stresses, are calculated for numerous crack arrays (n = 2–1024), a wide range of nondimensional crack lengths (1 /a = 0.005–0.625), and various levels of autofrettage (ε = 30, 60, 100 percent) via the finite element method. The obtained results emphasize the notable significance of the number of cracks in the array, as well as the importance of the level of autofrettage, on the stress intensity factor prevailing at the tip of these cracks. The sensitivity of the favorable effect of the overstrain in slowing down fatigue crack growth to any decrease in the level of autofreggate is also discussed.

Copyright © 1988 by ASME
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