As a companion problem to that of a flat elliptical crack subject to a uniform tension perpendicular to the crack plane, this paper deals with the case of arbitrary shear loads. Upon superposition, solutions to problems of an infinite solid containing an elliptical crack subjected to loads of a general nature may be obtained. It is shown that the three-dimensional stresses near the crack border can be expressed explicitly in terms of a convenient set of coordinates r and θ defined in a plane normal to the edge of the crack. In such a plane, the local stresses in a solid are found to have the same angular distribution and inverse square-root stress singularity as those in a two-dimensional body under the action of in-plane stretching and out-of-plane shear. This result will, in general, hold for any plane of discontinuity bounded by a smooth curve. Such information provides a clear interpretation of current fracture-mechanics theories to three dimensions. In particular, stress-intensity factors kj(j = 1, 2, 3), used in the Griffith-Irwin theory of fracture, are evaluated from the stress equations for determining the fracture strength of elastic solids with cracks or flaws.
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September 1966
Research Papers
Three-Dimensional Stress Distribution Around an Elliptical Crack Under Arbitrary Loadings
M. K. Kassir,
M. K. Kassir
Lehigh University, Bethlehem, Pa.
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G. C. Sih
G. C. Sih
Firestone Flight Sciences Laboratory, California Institute of Technology, Pasadena, Calif.
Search for other works by this author on:
M. K. Kassir
Lehigh University, Bethlehem, Pa.
G. C. Sih
Firestone Flight Sciences Laboratory, California Institute of Technology, Pasadena, Calif.
J. Appl. Mech. Sep 1966, 33(3): 601-611 (11 pages)
Published Online: September 1, 1966
Article history
Received:
May 12, 1965
Revised:
November 29, 1965
Online:
September 15, 2011
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Kassir, M. K., and Sih, G. C. (September 1, 1966). "Three-Dimensional Stress Distribution Around an Elliptical Crack Under Arbitrary Loadings." ASME. J. Appl. Mech. September 1966; 33(3): 601–611. https://doi.org/10.1115/1.3625127
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