Surface/Interface Effects on The Scattering of In-Plane Elastic Waves by a Multi-Coated Nanofiber

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Taheri Jam, Masoud | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52271 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Mohammadi Shodja, Hossein
Abstract:
In the framework of surface elasticity theory, the scattering of in-plane elastic waves by a multicoated nanofiber embedded in an elastic matrix is studied. Atoms near an interface experience a local environment different from it within the bulk. Going from macro to nano dimensions, surface to volume ratio increases significantly. Thus, on this scale it is important to consider the surface/interface properties as well as the bulk properties. In this dissertation, the surface/interface is modeled by a very thin layer in which the traction and displacement are discontinuous. Effects of surface/interface parameters on the dynamic stress concentration factor (DSCF) and scattering cross section (SCS) is investigated. It is shown that, even very small discontinuities across the interfaces compares to lattice parameter can meaningfully affect the results
Keywords:
Surface Effect ; Surface Elasticity ; Scattering ; Nanofiber ; Imperfect Interface ; Elastic Wave ; Interface Effect

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