Failure behavior of on-site repaired CFRP laminates

Date

2023-05-01

Author

Sonat, Evren
Bakır, Mete
Özerinç, Sezer

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On-site repairs of carbon fiber reinforced polymer (CFRP) composites involve out-of-autoclave curing, which increases the defect density and reduces the mechanical properties. This work aims to understand the strength and the associated failure mechanisms of on-site repaired woven CFRP laminates through experiments and simulations. A series of wet lay-up and prepreg step repaired specimens produced according to standardized aerospace procedures were tested under uniaxial tension. Wet lay-up repair provided a strength recovery of 66%, whereas prepreg repairs maintained 76% of the original strength. Finite element modeling closely predicted the experimentally observed behavior and showed that stress concentrations due to the adhesive-adherent stiffness mismatch are the primary causes of the lowered strength. The findings provide systematic experimental data and an accurate modeling framework to design and implement effective repairs in practice.

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85148547764&origin=inward
https://hdl.handle.net/11511/102658

Journal

Composite Structures

DOI

https://doi.org/10.1016/j.compstruct.2023.116806

Collections

Department of Mechanical Engineering, Article

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Citation Formats

E. Sonat, M. Bakır, and S. Özerinç, “Failure behavior of on-site repaired CFRP laminates,” Composite Structures, vol. 311, pp. 0–0, 2023, Accessed: 00, 2023. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85148547764&origin=inward.