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Stress-intensity factors for a wide range of semi-elliptical surface cracks in finite-thickness platesSurface cracks are among the more common flaws in aircraft and pressure vessel components. Several calculations of stress-intensity factors for semi-elliptical surface cracks subjected to tension have appeared in the literature. However, some of these solutions are in disagreement by 50-100%. In this paper, stress-intensity factors for shallow and deep semi-elliptical surface cracks in plates subjected to tension are presented. To verify the accuracy of the three-dimensional finite-element models employed, convergence was studied by varying the number of degrees of freedom in the models from 1500 to 6900. The 6900 degrees of freedom used here were more than twice the number used in previously reported solutions. Also, the stress-intensity variations in the boundary-layer region at the intersection of the crack with the free surface were investigated.
Document ID
19790044877
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Raju, I. S.
(NASA Langley Research Center Hampton, VA, United States)
Newman, J. C., Jr.
(NASA Langley Research Center Hampton, Va., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1979
Publication Information
Publication: Engineering Fracture Mechanics
Volume: 11
Issue: 4, 19
Subject Category
Structural Mechanics
Accession Number
79A28890
Distribution Limits
Public
Copyright
Other

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