Results 221 to 230 of about 23,328 (266)

Three dimensional crack closure measurements

23rd Aerospace Sciences Meeting, 1985
This 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 Cracks: An Introduction

1996
In the previous chapters the solution of two-dimensional and axi-symmetric crack problems have been examined in detail by employing the technique of distributing strain nuclei (in the form of dislocations or dislocation dipoles). Although the two-dimensional crack models give a good approximation to crack geometries encountered, most defects or cracks ...
D. A. Hills, P. A. Kelly, D. N. Dai, A. M. Korsunsky   +3 more
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Scattering from three-dimensional cracks

IEEE Transactions on Antennas and Propagation, 1989
Scattering 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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On the griffith criterion for three-dimensional cracks

International Journal of Engineering Science, 1988
Abstract 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, 1990
A 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, 1997
The 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

1984
The 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, 2008
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Fett, T., Funfschilling, S., Hoffmann, M. J., Oberacker, R.   +3 more
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Lattice theory of three-dimensional cracks

Journal of Applied Physics, 1976
The problem of the stability of a three-dimensional crack will be analyzed within a lattice-statics approximation. Hsieh and Thomson employed a similar approach for a two-dimensional crack. In that work the force was taken to be linear up to an arbitrary displacement and set equal to zero for larger displacements.
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Three-dimensional problem of a running crack

International Journal of Engineering Science, 1979
Abstract 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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