Quarter Elliptical Cracks Emanating From Holes in Plates

[+] Author and Article Information
T. E. Kullgren

Department of Civil Engineering, Engineering Mechanics and Materials, U. S. Air Force Academy, Colo.

F. W. Smith

Department of Mechanical Engineering, Colorado State University, Fort Collins, Colo.

G. P. Ganong

U. S. Air Force Weapons Laboratory, Kirtland Air Force Base, N. M.

J. Eng. Mater. Technol 100(2), 144-149 (Apr 01, 1978) (6 pages) doi:10.1115/1.3443463 History: Received September 08, 1977; Revised December 08, 1977; Online August 17, 2010


The finite element-alternating method, a linear elastic solution technique, is refined and applied to problems of quarter-elliptical cracks in irregular bodies. The method involves the iterative superposition of a finite element solution for stresses in an unflawed body and an analytic solution for stresses in an infinite solid containing a flat elliptical crack. Mode-one stress intensity factors are presented along the periphery of quarter-elliptical cracks emanating from open fastener holes in flat plates. Results are shown for a variety of crack geometries and two hole-diameter to plate-thickness ratios. Comparisons are made with experimental results of other authors.

Copyright © 1978 by ASME
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