Volume 18, Issue 3 (2018)                   IQBQ 2018, 18(3): 369-379 | Back to browse issues page

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Barati E, salmanian mobarakeh A, Sadeghi G. Computation of stress intensity factors and T- stress for cracks repaired by single and double composite and metallic patches. IQBQ. 2018; 18 (3) :369-379
URL: http://journals.modares.ac.ir/article-15-12-en.html
1- Mechanical and Aerospace Engineering Department, Malek-Ashtar University of Technology, Shahinshahr, Esfahan, Iran.
2- Mechanical and Aerospace Engineering Department, Malek-Ashtar University of Technology, Shahinshahr, Esfahan, Iran
3- Iran Aircraft Manufacturing Industrial Company (HESA), Iran Aviation Industries Organization, Shahinshahr, Iran
Abstract:   (1053 Views)
Due to various benefits of composite materials such as light weight, high strength and their excellent formability, the externally bonded composite patches have been proved to be a preferable method of repairing flaws and cracks in various engineering structures. In this paper, the behavior of various patches such as composite and metallic patches has been studied by calculating the stress intensity factor and the T-stress via 3D finite element method. The study of the out-of-plane bending role in repair of plates with single-sided patch is another aims of this research. The results showed that the higher stiffness of the composite patch leads to further reduction in stress intensity factor. It is found that in the studied specimens, the boron/epoxy patch has the better behavior compared with glass/epoxy one. Furthermore, using single-sided and double-sided patches leads to change in the T-stress value. The largest change achieved by the crack angle equals to 0 and the smallest on achieved by the crack angle equals to 45 degrees. Increasing the adhesive thickness leads to increasing the stress-intensity factor in repaired plate. Finally, it is found that the out-of-plane bending has the significant effect on behavior of repair with single-sided composite patch.
     
Article Type: Research Article | Subject: Creep, Fatigue & Failure
Received: 2017/10/21 | Accepted: 2018/02/12 | Published: 2018/03/10

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