Computer simulations studies: I. Dynamics of brittle crack propagation. II. Brittle to ductile transition temperature.
Item
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Title
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Computer simulations studies: I. Dynamics of brittle crack propagation. II. Brittle to ductile transition temperature.
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Identifier
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AAI9530902
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identifier
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9530902
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Creator
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Massoumzadeh, Behzad.
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Contributor
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Adviser: Rutherford Fischer
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Date
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1995
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Condensed Matter | Engineering, Materials Science | Computer Science
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Abstract
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Molecular Dynamics Simulations Technique is used to investigate the effect of geometry of the crack-tip on the local stress distribution, the influence of the interatomic potential law on the crack-tip velocity of the brittly propagating cleavage cracks, dynamics and energetics of brittle fracture, and brittle-to-ductile transition temperature on a variety of two-dimensional (triangular) crystals. The main goal of these investigations is to model the general fracture phenomena, rather than to make predictions for a particular crystal. The simulations results indicate that the discreteness of the lattice limits the degree of the geometric blunting. The interatomic potential is found to be the most important factor in determining the upper limit for the magnitude of the terminal crack-tip velocity. The transition from the brittle behavior to ductile failure, as the temperature of the system is increased, is recognized by the observation of the first thermally activated spontaneous emission of blunting dislocation from the crack-tip prior to any breakage of the crack-tip interatomic bond. The simulations results indicate that BDT in investigated solids are gradual.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
