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 seg¬ment being comprised of a generally U-shaped corruga¬tion 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 be¬yond 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.
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