Results 151 to 160 of about 58,697 (194)

Dislocation loops in hexagonal crystals

Journal of the Mechanics and Physics of Solids, 1974
Summary In this paper, E. Kroner's representation of the Green's function is first used to derive closed-form solutions for the components of the displacement and stress fields created by an arbitrary dislocation loop situated in a basal plane of a hexagonal crystal. The interaction energy of two dislocation loops in basal planes is then calculated.
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Dislocation loops in irradiated zirconium

Philosophical Magazine, 1966
Abstract Transmission electron microscope observations of damage in zirconium irradiated with krypton ions are reported. Dislocation loops were observed in irradiated and annealed specimens. These loops were interstitial in nature, fault free and were oriented near primary and secondary prism planes. The Burgers vectors were of the type b=(α/3) . It is
T. D. Gulden, I. M. Bernstein
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Diffuse scattering from dislocation loops

Physical Review B, 1982
Diffuse scattering from crystals containing dislocation loops has been calculated. An emphasis was made to reduce numerical computation of lattice sums by an appropriate summing procedure and by limitation of the summation volume by a smooth damping function.
P. Ehrhart, H. Trinkaus, B. C. Larson
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Image Simulation of Dislocation Loops

Proceedings, annual meeting, Electron Microscopy Society of America, 1976
Computer simulation of image contrast is a useful tool in the identification of lattice defects observed in the electron microscope. In order to obtain high quality simulated micrographs, it is necessary either to consume a considerable amount of computer time or to have the micrographs processed through special photographic devices.
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Atomic Displacements around Dislocation Loops

Journal of Applied Physics, 1968
The displacement field around a ``penny-shaped'' inclusion or void in an isotropic elastic medium has been computed by the methods outlined by Sneddon. The boundary conditions for such a loop are that in the plane of the loop z = 0, the displacement is = ±| b |/2 for r less than the loop radius c, and zero outside the loop, and that the shear stress in
D. T. Keating, A. N. Goland
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Energy of elliptical dislocation loops

Philosophical Magazine, 1966
Abstract The strain energy of an elliptical dislocation loop of arbitrary Burgers vector is obtained analytically using isotropic elasticity theory.
James C. M. Li, Gaines C. T. Liu
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Size distribution of dislocation loops

Acta Metallurgica, 1973
Abstract The annealing behavior of dislocation loops in aluminium obtained by bulk quenching is discussed. If the mean distance between loops is small compared with the grain-size of the specimen, the total number of vacancies condensed in loops remains constant, whilst the difference of chemical potential at loops of different sizes provides a ...
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Energy of Polygonal and Elliptical Dislocation Loops

physica status solidi (b), 1966
AbstractA general expression for the elastic strain energy of an arbitrary N‐sided planar polygonal dislocation loop is obtained from the stress field of dislocation segments using isotropic elasticity. This expression can be used to approximate the energy of any curved dislocation loop to any degree of accuracy.
G. C. T. Liu, J. C. M. Li
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Dislocation of Binkhorst Four-Loop Lens Implant

Ophthalmology, 1979
A consecutive series of 1,093 Binkhorst four-loop lens implantations was used to examine the problem of dislocation of implants used in intracapsular cataract extractions; emphasis of the study was on the need for suture fixation. Transiridectomy suture fixation was used in 497 procedures, no suture was used in 403 procedures, and a simple iris suture ...
N S, Jaffe, D M, Eichenbaum, H M, Clayman, D S, Light   +3 more
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Continuum theory of dislocation loops

International Journal of Solids and Structures, 1965
Abstract For dislocation loops, the zeroth moment of dislocation strength always vanishes so that the first moment must be defined in order to give a continuum description. A second order tensor is thus introduced to account for the dislocation moment. This physical quantity contains more information than the macroscopic plastic strain.
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