Abstract: The invention is a structure for a strong, lightweight corrugated sheet. The sheet is planar or curved and includes a plurality of corrugation segments, each segment being comprised of a generally U-shaped corrugation 12 with a part-cylindrical crown 13 and cap strip 20, and straight side walls 14 and 15 with secondary corrugations 16 oriented at right angles to said side walls. The cap strip 20 is bonded to the crown 13 and the longitudinal edge 18 of said cap strip extends beyond edge 17 at the intersection between said crown and said side walls. The high strength relative to weight of the structure makes it desirable for use in aircraft or spacecraft.

Abstract: Lightweight capped honeycomb stiffeners 18 for use in fabricating metal or metal/matrix exterior structural panels 14 on aerospace type vehicles 10 and the process for fabricating same are disclosed. The stiffener stringers are formed in sheets (FIG. 6), cut to the desired width and length and brazed in spaced relationship to a skin 16 (FIG. 2) with the honeycomb material serving directly as the required lightweight stiffeners and not requiring separate metal encasement for the exposed honeycomb cells.