Computational Homogenization of Inter-Facial Thermal Resistance in Heterogeneous Materials

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Akbari, Ramin | 2017

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 50528 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Khoei, Amir Reza
Abstract:
The constitutive modeling of heterogeneous micro-structure of solids based on multi-scale theories has become the subject of intensive research. One of the most important problem at this scale is the interfacial effects of constituents. Investigation of thermal conduction in this area leads to a phenomenon known as Inter-facial Boundary resistance. The general reasons behind this phenomenon are imperfect contact interface and changing in energy carriers properties known as Kapitza resistance. A computational homogenization of conduction tensor by considering inter-facial resistance and effective factors on it, is proposed. In order to capture discontinuous field around this area and its general shape, nonlinear form of Extended Finite Element method is implemented. Homogenized Interfacial thermal resistance is computed based on contact mechanics and large plastic deformation of materials. Homogenized conduction is examined by direct numerical simulation (DNS) in a transient problem
Keywords:
Multiscale Method ; Computational Homogenization ; Direct Numerical Simulation (DNS) ; Thermomechanical Processing ; Thermo-Mechanical Analysis ; Heterogeneous Materials ; Inter-Facial Thermal Resistance

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