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Development of a Field Repair Technique for 'Mini-Sandwich' Kevlar/Epoxy Aircraft Skin.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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An experimental analysis was performed on Kevlarepoxy cloth mini-sandwich panels with cellular foam core. Three undamaged panels and twenty-three other panels with damage and repairs were subjected to static shear loading. Four parameters were varied in the types of repairs, hole size, hole plug filler material, patch material, and patch overlap distance. All twenty-six panels were tested to failure. A repair technique employing a cellular foam plug and fiber-glass patches overlapping the original hole by 0.50 inches, symmetrically applied with structural adhesive, was found to be suitable for repair of up to three inch diameter circular holes at field repair level. Additionally, postbuckling energy absorption was qualitatively examined for undamaged panels and for hole sizes ranging from 1 to 5 inches diameter. Originator-supplied keywords included Mini-Sandwich, Composite Material, Shear Loading, Repair, KevlarEpoxy, Aircraft panels, Theses.
APPROVED FOR PUBLIC RELEASE