Kubota Research Associates Inc. (Hockessin, Del.) has developed P-Wave/PTIR, an infrared-assisted, advanced out-of-autoclave prepreg material and process to enhance adhesion properties as well asaccelerate the curing speed of thermoset resin systems for installing adhesive-bonded fasteners (ABF) such as CLICKBOND studs and standoff onto composite fuselage and metal structures. Kubota notes that OEM-qualified room-temperature-cured, two-part epoxy adhesives such as Hysol EA9394 (from Henkel, Rocky Point, Conn.) and Magnobond 6398 (Magnolia Advanced Materials, Chamblee, Ga.) are used to install CLICKBOND fasteners onto composite fuselages. These adhesives, says Kubota, are temperature sensitive for curing and typically set in 24 hours and cure in five to seven days at 25°C/77°F. The P-Wave/PTIR process used with the same qualified adhesives reportedly can bond and cure the fasteners onto the substrate in less than 10 minutes. The process can be applied under a range of operating temperature conditions from -20°C/-4°F to 50°C/122°F. The process also is designed to enhance wettability between the adhesive and substrates to increase the fastener-to-substrate bonding strength. In addition, reports Kubota, the P-Wave/PTIR ABF installation fixture is reusable and replaces the disposable one time use Pressure Application Fixture.
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