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Analysis of Degradation for Laminated Notched Plate in Micromechanics by “Strain Energy Release Rate” Method and Illustrations the Results in Ansys

Gholi Mesgarha, Payam | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48942 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Hosseini Kordkheili, Ali
  7. Abstract:
  8. By developing composites, difficulties of modeling of degradation of properties as stiffness is most considered. The recent advances in the modeling of degradations in stratified composites have led to improved models on all scales. Macro scales methods are good to estimate fracture but not to estimate the failure in micro scale (as microcrack) and moreover, they need many experimental data. Therefore by considering a stratified structure which contains fiber, matrix and intermediate area, mesoscale modeling method is most suitable. In this research Micromechanical Progressive Algorithm (MPA) is used. The method employed is Micromechanic Method of Fracture (MMF). In this work by developing a finite element code a laminated plate is considered which has central notch and three dominant of degradation mechanisms are considered contain fiber breakage, diffuse damage and matrix cracking by following last works. The code is developed by “step by step” solution method and to verification the results is compared with last similar works and experimental results done by yashiro. Then in order to innovation a new model which is linear continuous relation for fiber breakage failure and the advantages and disadvantages are presented. Finally this work is done for many new models and concluded
  9. Keywords:
  10. Damage ; Diffusers ; Failure Analysis ; Micromechanical Model ; Diffuse Damage ; Fiber Breakage ; Mation Cracking

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