POLYMER MATRIX COMPOSITES ARE INCREASINGLY REPLACING TRADITIONAL METALLIC MATERIALS IN NASA LAUNCH VEHICLES…

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POLYMER MATRIX COMPOSITES ARE INCREASINGLY REPLACING TRADITIONAL METALLIC MATERIALS IN NASA LAUNCH VEHICLES DUE TO HIGH STRENGTH TO WEIGHT RATIO, MANIPULATIVE PROPERTIES, AND CORROSION RESISTANCE. HOWEVER, THE INSPECTION AND REPAIR METHODS FOR THESE MATERIALS ARE CONSIDERABLY MORE COMPLICATED. FOR AEROSPACE PLATFORM REPAIRS, A COMPOSITE LAMINATE PATCH MUST BE MANUALLY FABRICATED ONSITE AND THEN BONDED TO THE DAMAGED STRUCTURE. PRIOR TO THE BONDING OR COCURING, A VACUUM DEBULK PROCESS IS PERFORMED ON THE LAYUP, REQUIRING A SEPARATE PIECE OF SUPPORT EQUIPMENT. THE IDEAL METHOD WOULD ALLOW FOR A RAPID STRUCTURAL REPAIR TO BE PERFORMED IN LOCATIONS WITH MINIMAL ACCESS WITHOUT THE NEED FOR EXTENSIVE TOOLING, SURFACE PREP, CURE TIMES AND COMPLICATED TECHNIQUES. IN PHASE I, ENGINEERS AT LUNA DEMONSTRATED A COMPREHENSIVE SYSTEM THAT INCLUDED FACILE SURFACE PREPARATION, SINGLE BAG OUT OF AUTOCLAVE PROCESSING AND LUNAS UNIQUE FIBER OPTIC MEASUREMENT CAPABILITY FOR MONITORING REPAIR STATE. THIS PHASE II PROGRAM WILL FOCUS ON OPTIMIZING THESE METHODS FOR LAUNCH VEHICLE COMPOSITE DAMAGE THAT CAN BE PERFORMED DURING GROUND PROCESSING OF THE LAUNCH VEHICLE WITHOUT THE NEED FOR FULL REPLACEMENT. IT IS EXPECTED THAT THE TECHNOLOGY WILL MEET NASA LAUNCH VEHICLE REQUIREMENTS AND DEMONSTRATE POTENTIAL FOR IN SITU REPAIRS TO SPACECRAFT ON LONG MISSIONS.