Results 231 to 240 of about 22,441 (265)
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Scattering from three-dimensional cracks
IEEE Transactions on Antennas and Propagation, 1989Scattering from three-dimensional cracks is analyzed and measured. The crack geometry is modeled as a rectangular groove in a perfectly conducting surface. The groove forming the crack may be terminated with an open aperture creating a slit in the conducting surface or with an impedance boundary creating a trough.
A.K. Dominek, H.T. Shamansky, N. Wang
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Scattering by a planar three-dimensional crack
The Journal of the Acoustical Society of America, 1987The scattering of a three-dimensional crack is formulated by the boundary integral equation method. A numerical scheme for solving the derived integral equations by using triangular boundary elements is described in detail. The computed results include the stress intensity factors and the scattered patterns for cracks having an elliptical shape.
W. Lin, L. M. Keer
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Three dimensional crack closure measurements
23rd Aerospace Sciences Meeting, 1985This paper describes fatigue crack growth and retardation experiments conducted in polycarbonate test specimens. This transparent model material allowed optical interferometry measurements of through-the-thickness fatigue crack opening profiles. Crack surface displacements were then obtained through the specimen thickness and are discussed in terms of ...
S. RAY, S. ANDREW
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Three-dimensional crack analysis
International Journal of Solids and Structures, 1977Abstract A method is presented for the stress analysis of plane cracks of any shape in a stressed three-dimensional linear elastic space. The approach utilizes a system of integral equations which is defined over the crack area only. When these equations are solved for the unknown dislocations, all other quantities related to the crack and the space ...
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On the griffith criterion for three-dimensional cracks
International Journal of Engineering Science, 1988Abstract The Griffith theory of brittle fracture is extended to three-dimensional cracks. A mathematical formulation of the theory encounters insurmountable difficulties since the shape into which the crack would grow is not known a priori. A physical hypothesis for the determination of the new crack shape which would allow the subsequent calculation
N.K. Hatzitrifon, E.E. Gdoutos
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Three-dimensional crack closure behavior
Engineering Fracture Mechanics, 1990A crack closure measurement technique involving fatigue striations was used to produce a three-dimensional crack opening load profile for 2024-T351 aluminum alloy. The crack opening load profile, determined through the specimen thickness, was compared with crack opening load measurements made with strain gages and displacement gages.
D.S. Dawicke, A.F. Grandt, J.C. Newman
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Self-Similar Crack Expansion Method for Three-Dimensional Crack Analysis
Journal of Applied Mechanics, 1997The self-similar crack expansion method is developed to calculate stress intensity factors for three-dimensional cracks in an infinite medium or semi-infinite medium by the boundary integral element technique. With this method, the stress intensity factors at crack tips are determined by calculating the crack-opening displacements over the crack ...
Xu, Yonglin, Moran, B., Belytschko, T.
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Three-dimensional crack problems
1984The present chapter is devoted to the investigation of the growth characteristics of arbitrary cracks embedded in three-dimensional bodies. The general equations of the strain energy density criterion developed in chapter one are used to determine the critical loads for crack extension, as well as the new shape of the crack after propagation.
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Different R-Curves for Two- and Three-Dimensional Cracks
International Journal of Fracture, 2008zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Fett, T. +3 more
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Three-dimensional problem of a running crack
International Journal of Engineering Science, 1979Abstract The problem of an uniformly propagating finite crack in an infinite medium is solved using the dynamic equations of elasticity in 3-dimensions. Equal and opposite tractions are applied arbitrarily to the crack surfaces. The problem is reduced to the dual integral equations and solved with the aid of the series method.
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