Surface and Interface Effects on the Elastic Fields of an Edge Dislocation Inside a Silicon Nanotube with Thin Siox Coating

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Azizi, Pegah | 2021

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53697 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Mohammadi Shodja, Hossein
Abstract:
The exact analytical elastic fields within a double-walled silicon nano-tube with a thin layer of SiOx coating associated with surface/ interface effects as well as the classical theory of elasticity due to the presence of an edge dislocation with an arbitrary Burger’s vector and position inside of the silicon is determined via complex potential function method. Stress contours within surface elasticity and classical theory are given, and both theory results are compared. Then, the effects of surface Lamé Constants, magnitude and direction of Burger’s vector, shear modulus, nano-tube size, and position of the edge dislocation on the distribution of stress components are illustrated, and the results are discussed. In addition, Image forces acting on the dislocation, with and without an account of the surface stress, are compared together and discussed. It is shown that by reaching the interface and free surfaces, the results from surface elasticity and classical theory significantly differed. Also, the negative intrinsic length induces Rippling Effects on the distribution of stress components within the nano-tube
Keywords:
Elastic Fields ; Silicon Nanotube ; Edge Dislocation ; Surface Effect ; Interface Effect ; Silicon Dioxide

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