The hard-patch approach to scarf repairs involves adhesively bonding a pre-formed patch into the scarf cavity. This approach has several potential advantages compared with the conventional soft-patch approach, which involves forming the patch from pre-preg and co-bonding it with the adhesive during cure of the patch directly in the repair cavity. Two methods for producing the hard-patch were investigated. The first was the moulded approach where the patch was laid up in a mould and cured prior to bonding in the repair cavity. The development and implementation of the moulded hard-patch repair technique on an F/A-18 horizontal stabiliser is described. The second approach involves machining the patch from a composite panel using digitised data obtained from the use of surface profiling equipment to capture the scarf cavity surface. Micrographic techniques were used to assess critical features of the bond-line produced from the different techniques. The results are compared with microscopic studies from a second F/A-18 horizontal stabiliser that was repaired much earlier using the soft-patch approach. Each repair is assessed in terms of the consolidation of plies along the bond-line and the conformity of the patch to the repair cavity as well as adhesive uniformity and porosity.
Micrographic studies on adhesively bonded scarf repairs to thick composite aircraft structure
Composites, Part A: Applied Science and Manufacturing ; 40 , 9 ; 1419-1432
2009
14 Seiten, 16 Bilder, 3 Tabellen, 15 Quellen
Article (Journal)
English
Anwendung in der Luft- und Raumfahrt , carbonfaserverstärkter Kunststoff , Epoxidharz , Flugzeugzelle , geometrische Form , Klebestreifen (Selbstkleber) , Klebverbindung , konische Form , Laminat , Mikrographie , optische Mikroskopie , Reparatur , Reparaturmaterial , schräge Einfallsrichtung , Schrägstoß , Spanen (mit Kontur)
Interfacial cracks in adhesively bonded scarf joints
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