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Elastic-Plastic Behavior Analysis of Short Fiber Metal Matrix Composites under Thermal Loading

Khosoussi, Sadaf | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 51374 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Abedian, Ali; Mondali, Mahdi
  7. Abstract:
  8. The use of metal matrix composite materials (MMC) in aerospace structures and engine parts has become more frequent recently. These materials are composed of metal matrices reinforced by hard discontinuous ceramic fibers, usually oriented longitudinally within the matrix, and due to the stability of the mechanical properties, including the hardness and the strength at high working temperatures, have found various applications.Stress transfer from the matrix to the fiber is known as the most important mechanism governing the deformation and the fracture response of such MMCs. The stress transfer characteristic of fiber reinforced composite materials under various mechanical and thermal loadings has been studied frequently. Due to the high applications of metal matrix composites in different environments such as various engine parts, or the inner engine walls, these materials are usually subjected to very high temperature differences. According to the high difference between the thermal expansion coefficients of the fiber and the matrix, thermal stresses will occur at the matrix/fiber interface, which detailed study of such phenomenon is of a great importance, before going through the design of various parts made from these materials.In the present study, analytical-numerical analysis of the elasto-plastic behavior of metal matrix composites under thermal loadings is of concern. In the proposed research, employing a micromechanical approach, an axi-symmetric unit cell including one fiber and the surrounding matrix are considered. First, the governing equations and the boundary conditions are derived using the model and the elastic solution is obtained based on some existing shear lag type methods. Since the metal matrix undergoes plastic deformation, using successive elastic solutions approach, elastic-plastic analysis of the matrix is performed considering plasticity theories and hardening models for the metal matrix. The results are compared with the numerical results obtained from the FE analysis of the considered micromechanical model
  9. Keywords:
  10. Metal Matrix Composite (MMC) ; Shear Lag ; Thermal Loading ; Micromechanical Model ; Elastic-Plastic Analysis ; Plasticity ; Successive Elastic Solution

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