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RESEARCH PAPERS

Cracks Emanating From an Erosion in a Pressurized Autofrettaged Thick-Walled Cylinder—Part I: Semi-Circular and Arc Erosions

[+] Author and Article Information
C. Levy, H. Fang

Center for Engineering and Applied Science, Department of Mechanical Engineering, Florida International University, Miami, FL 33199

M. Perl

Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer Sheva, 84105, Israel

J. Pressure Vessel Technol 120(4), 349-353 (Nov 01, 1998) (5 pages) doi:10.1115/1.2842342 History: Received February 20, 1997; Revised April 15, 1998; Online February 11, 2008

Abstract

Erosion geometry effects on the mode I stress intensity factor (SIF) for a crack emanating from the erosion’s deepest point in an autofrettaged, pressurized, thick-walled cylinder are investigated. The problem is solved via the FEM method and knowledge of the asymptotic behavior of short cracks. Autofrettage, based on von Mises yield criterion, is simulated by thermal loading and SIFs are determined by the nodal displacement method. SIFs are evaluated for a variety of relative crack lengths, a0 /W = 0.01 – 0.45, emanating from the tip of erosions of different geometries. In Part I of this paper, two configurations are considered: (a ) semi-circular erosions of relative depths of 5 percent of the cylinder’s wall thickness, W ; and (b ) arc erosions for several dimensionless radii of curvature, r′/W = 0.05 – 0.4. While deep cracks are almost unaffected by the erosion, the effective SIF for relatively short cracks is found to be significantly enhanced by the presence and geometry of the erosion and might reduce the vessel’s fatigue life.

Copyright © 1998 by The American Society of Mechanical Engineers
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