To realize a light-weight, low-cost airframe for future aircraft, fewer components and
boltless assembly through the large-scale one-shot construction using carbon fiber-reinforced
plastic (CFRP) are key technologies. For parts for large-scale one-shot construction, the
application of a sandwich structure where high rigidity can be easily obtained is effective. This
paper discusses the CFRP monolithic sandwich structure, which is lighter and less corrosive than
a traditional honeycomb structure. In particular, the corner fillets (placed around the corners) in
this structure were focused on, and an adhesion peel strength improvement effect was identified
through numerical analysis. A prototype was manufactured in accordance with the one-shot curing
process and its favorable quality was verified.
