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Studying the Effect of Thermal Loading on Delamination Phenomenon of Composite Materials using Continuum Damage Mechanics

Teimouri, Hesamoddin | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42007 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Abedian, Ali
  7. Abstract:
  8. Metal and inter-metallic matrix composites offer high performance materials suitable for many low weight applications which are of growing interest in high tech industries. However, to submit their entire potential applications, their complex mechanical behavior has to be understood. Nevertheless, one of the major setbacks of designing with these materials has been the delamination phenomenon. So far, this phenomenon has been considered from macro-mechanical point of view regarding laminates to be semi-isotropic or orthotropic; which indicates the importance of micro-mechanical research to be done. Furthermore, the fact that macroscopic response and failure mechanisms of these composites are much more sophisticated under the influence of thermal residual stresses cannot be ignored.
    In this research two cooling down processes are investigated. In the first case, the influence of boundary conditions on inelastic behavior of metallic and inter-metallic matrix composites are studied by considering samples extracted from middle, side and corner zones of [0/90] and [0/90]s laminates. In the second case, the generalized plane strain boundary conditions are applied to the FEM model supplemented by sophisticated damage-plasticity constitutive equations to simulate the overall behavior of metal matrix composites by changing fiber volume fraction and fiber distances. To enhance the capabilities of the commercial FEM software (ANSYS), the ability of solving coupled damage-plasticity equations has been added to the main frame of the software as an external subroutine
  9. Keywords:
  10. Finite Element Method ; Numerical Simulation ; Boundary Conditions ; Metal Matrix Composite (MMC) ; Continuum Damage Mechanics ; Intermetalic Matrix Composite (IMC)

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