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Structural Health Monitoring of Elbows, Tee Junctions, Composite to Composite and Composite to Metal Joints for Pressurized Tubular Structures Using Strain and MPCA Algorithm

Robatjazi, Hassan | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50785 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Abedian, Ali
  7. Abstract:
  8. In this thesis, due to the importance of pressurized structures, method or methods that can be used to monitor the health of important structures, such as pressurized pipes (gas transmission and distribution lines or hydraulic lines), are considered. A key point in monitoring such structures is to ensure the function of pipes, elbows, Tee junctions, composite to composite and composite to metal joints. The topic that will be discussed more than anything else here is to monitor the health of the structure in the presence of cracks in some layers of composite pieces. In fact, it must be recognized before cracking occurs in all layers of composite pieces and causing overall damage to the structure. It should be noted that previously undrawn structures have been investigated by many researchers, but the assumptions of these researchs are based on modal frequency analyzes that are more applicable to small components and do not have much effect on large structures, and sometimes to obtain these information and methods to The work taken does not meet all the health monitoring needs of such structures. Therefore, in the present study, the monitoring method will be used based on strain monitoring, which is, in fact, strain instead of using optical fiber by the numerical method of FEM. The use of the MPCA algorithm will be used in this study. The final result was that the cracks in the inner layers can be identified before the entire structure is seriously damaged and exhausted. So that in all composite models with different layout of sensor network with the size of the moving window 3 in the MPCA algorithm, the presence of cracks in the 5 inner layers can be detected
  9. Keywords:
  10. Damage Detection ; Finite Element Method ; Structural Health Monitoring ; Moving Principal Components Analysis (MPCA) ; Composite Tubes ; Hashin Criteria ; Pressurized Pipeline

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