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Studying Edge Dislocations and Wedge Disclinations in Core-Shell Nanowires by Incorporating Surface Effect

Rezazadeh Kalehbasti, Shaghayegh | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43377 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mohammadi Shodja, Hossein
  7. Abstract:
  8. By considering the effect of surface/interface stresses, classical problems of the interaction between dislocations/disclinations and nanowires are addressed. In particular, two distinct problems are solved: the first one consists of an edge dislocation seated inside the shell of a core-shell nanowire and the second one investigates a wedge disclination (dipole) located inside the shell of a core-shell nanowire. The stress field of the nanowire, strain energy per unit length and the image forces acting on the defects are calculated and discussed in detail. Moreover, the results are compared with their classical counterparts. These results show that by considering the effect of surface/interface, the stress field, strain energy and image forces would digress drastically from classical results by decreasing the size of the problem. Novel features such as non-classical oscillations in stress field and energy barriers for the defects are observed. The analyses conclude that surface/interface with positive (negative) shear modulus will repel (attract) the dislocation/ disclination. This non-classical force diminishes by increasing the size of the problem and the results converge to the classical ones. The forces and the strain energies ascend when the ratio of the shear modulus of the core to the shell of the nanowire increases
  9. Keywords:
  10. Glide Edge Dislocation ; Surface/Interface Stress ; Core-Shell Nanowire ; Wedge Disclination Dipole

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