Composite Repair Material and Design Development Efforts,
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA
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This paper discusses recent developments in the area of bonded bolted composite repair. An ideal resin or adhesive for field repair would have the following characteristics Ambient storage Low temperature cure Short time cure and Elevated temperature and moisture resistance. Two approaches were used to achieve resin formulations for repair patches which will meet these requirements. The first method utilizes chemically hindered diamines as curing agents for epoxy resins. The second method involves isolation of the curing agents from the epoxy resin by phase separation. In the area of adhesives for field repair of composites a 2 part paste adhesive has been developed. The adhesive meets all of the program requirements and can be used with various repair materials. A simplified design has been established which uses standard plate thicknesses, bolt sizes and spacing. Several patch shapes have been tested and found to restore design ultimate strains.