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Surface/Interface Effect on the Interaction of an Embedded Core-Shell Nanowire and Edge Dislocation and Generation of Misfit Dislocations in a Core-Shell Nanowire

Enzevaee, Camelia | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43406 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mohammadi Shodja, Hossein
  7. Abstract:
  8. Within the surface/interface elasticity, two following problem are solved: First the elastic behavior of an edge dislocation located inside the core of a core-shell nanowire which is embedded in an infinite matrix is studied within the surface/interface elasticity theory. The corresponding boundary value problem is solved exactly by using complex potential functions. The stress field of the dislocation, image force acting on the dislocation, and the dislocation strain energy is calculated by considering the interface effect. Second, the surface/interface elasticity approach is applied to the case of a misfit core-shell nanowire system in which the misfit strain is adjusted through the generation of (i) an edge misfit dislocation (MD), (ii) a dipole of edge MDs at the core-shell interface. The governing equations of the interface elasticity are solved by means of complex potential functions expanded in Laurent series to obtain elastic (strain) energy of the dislocation. Also, we discuss the main results of our model, which concern the effect of core size, shell thickness, elastic properties of the core-shell, surface/interface properties and misfit strain on the critical conditions for the generation of MDs.


  9. Keywords:
  10. Glide Edge Dislocation ; Eigenstrain ; Stress Field Distribution ; Surface/Interface Elasticity ; Core-Shell Nanowire ; Image Force

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