The current fleet of mid-size USAF cargo airplanes includes the C-130 and C-27J. These vehicles were initially designed more than 40 years ago and use conventional metallic construction approaches. Significant improvements in structural efficiency and manufacturability may be achieved by applying advanced structural analysis optimization methods and innovative joint designs for bonded composite structures. The new work described in this proposal would leverage and complement the accomplishments of the Composites Affordability Initiative lead by the Air Force Research Laboratory (AFRL). In this Phase I effort, our overall objective will be to combine advanced computational techniques, including finite element analysis and topology optimization, with novel designs for the spar web-to-wing skin bonded joint. The overall goal will be to create a structurally optimized deep wing concept that will improve design flexibility, joint strength, and manufacturability. The concept technologies will be applicable to future military applications, such as the Advanced Joint Air Combat System (AJACS), as well as commercial aircraft.
Keywords: Pi Clip, Wing Spar, Composite, Deep Wing, Blended Wing, Bonded Joint, Fasteners
