Mechanics of carbon nanotubes (CNTs) and their composites.
Item
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Title
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Mechanics of carbon nanotubes (CNTs) and their composites.
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Identifier
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AAI3296962
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identifier
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3296962
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Creator
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Wan, Huapei.
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Contributor
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Adviser: Feridun Delale
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Date
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2008
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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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Engineering, Mechanical
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Abstract
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In this thesis, the mechanical behavior of carbon nanotubes (CNTs) and the reinforced composites was studied using the continuum mechanics models. For single-walled nanotubes (SWNTs), a structural model based on molecular mechanics was developed. The model was then extended by considering the van der Waals forces to the study of multi-walled nanotubes (MWNTs). The current models were verified through many calculations and comparisons. As an application, the buckling behavior of carbon nanotubes (SWNTs and MWNTs) under axial compression and bending were studied. Another portion of the thesis was contributed to the continuum mechanics modeling of CNTs reinforced. The new contribution of the current work to the nanotube mechanics is a new strategy of correlating molecular potentials with strain energies of the structural members: beam and spring. In contrast to the existing model, the out-of-plane motion (inversion) of the covalent bond was distinguished from the in-plane motion in the current model. Consequently, the bending stiffness of the graphite layer can be correctly described. In addition, several key issues involved in the study of buckling behavior of CNTs under axial compression and bending loads were discussed. The role of geometrical perturbation on the onset of compressive buckling was well identified. For bending buckling, the buckling was found to be sensitive to the boundary conditions (BCs) applied at the ends of the nanotube. The continuum mechanics analysis of CNTs reinforced composites showed that a critical nanotube length was required in order to fully transfer the load between the high stiffness tube and the matrix. The effects of the tube length and the interphase on the effective properties of the reinforced composite were also discussed.
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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.
