Fatigue and static damage in curved woven fabric carbon fiber reinforced polymer laminates

Date

2022-06-01

Author

Tasdemir, Burcu
Çöker, Demirkan

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Failure mechanisms of curved cross-ply laminates under static and fatigue loading have been studied extensively, but the examination of fabric laminates which are the most commonly used ply type in curved supports in airplane wing structures is lacking. In this study, unidirectional (UD) and fabric carbon fiber reinforced polymer (CFRP) laminates are examined to elucidate the failure initiation mechanisms of laminated composites under fatigue and static loading. The crucial point of the research is applying the analyses using fabric laminate with a currently used stacking sequence in commercial airplanes. In addition to the fabric laminate, UD laminate is also included in the research to compare the real complex stacking with the simplest stacking. In the experiments, it is observed that both static and fatigue failures initiate roughly at the maximum radial stress location (approximately 35% of the thickness from the inner radius). For UD laminates, there is no visible difference between the failure mechanisms under static and fatigue loadings. However, for fabric laminates, fatigue failure is observed to occur as a single major crack at the maximum radial stress location as in UD laminates, whereas static failure is observed to occur as multiple diffusive cracks at the maximum radial stress location. Additionally, cracks grow mostly as intralaminar cracks connected with regions of occasional interlaminar cracks.

Subject Keywords

fatigue, fabric laminates, curved laminates, delamination, failure, DELAMINATION, BEHAVIOR, FAILURE, PREDICTION, SPECIMENS

URI

https://hdl.handle.net/11511/97032

Journal

JOURNAL OF COMPOSITE MATERIALS

DOI

https://doi.org/10.1177/00219983221078787

Collections

Department of Aerospace Engineering, Article

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Citation Formats

B. Tasdemir and D. Çöker, “Fatigue and static damage in curved woven fabric carbon fiber reinforced polymer laminates,” JOURNAL OF COMPOSITE MATERIALS, vol. 56, no. 11, pp. 1693–1708, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/97032.