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- W2324874230 abstract "A hybrid experimental-numerical investigation was conducted to study fatigue crack growth behavior of thick aluminum panels repaired with boron/epoxy composite patches. Experiments involved the fatigue testing of 6.350 mm thick specimens with pre-cracks of 25.4 mm repaired asymmetrically with a unidirectional Boron/Epoxy composite patch at 120 MPa maximum load and stress ratio 0.1. Repairs were found to provide at least 4 times improvement of fatigue life relative to unrepaired baseline specimens. The fatigue crack growth rates of the unpatched and patched faces were measured along with debond of the composite patch. A two-dimensional finite element method consisting of three-layers to represent the cracked plate, adhesive and composite patch was used to model the experiments. The stress intensity factors obtained from the analysis were combined with the fatigue growth relationship for the unrepaired cracked material to obtain the analytical crack growth rates. The experimental and analytical crack growth rates were in good agreement with each other up to the initiation of significant debond growth, which was about a total crack length of 80 mm on the 153 mm wide specimen." @default.
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- W2324874230 date "1998-04-20" @default.
- W2324874230 modified "2023-09-27" @default.
- W2324874230 title "Fatigue behavior in thick aluminum panels with a composite repair" @default.
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- W2324874230 doi "https://doi.org/10.2514/6.1998-1997" @default.
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