Reinforced composite corrugate body

A reinforced composite corrugated body comprising:

• a corrugated body formed of a sheet material having formed therein corrugate lines including, with respect to an x-y-z coordinate system, ridges and grooves formed alternately in an x direction and located in respective planes spaced in a z direction and parallel to an x-y plane, each said ridge and groove of each said corrugate line having a smooth meandering waveform in a y direction as viewed in said x-y plane, and said ridges and grooves defining a smooth meandering sectional waveform in said x direction as viewed in an x-z plane;
• said sectional waveform having an amplitude H in said z direction and a wavelength L in said x direction defining a substantial amplitude ratio H/L such that 0.4.ltoreq.H/L.ltoreq.1.4;
• said meandering waveform of each said corrugate line having an amplitude D in said x direction and a wavelength N in said y direction defining a substantial meandering ratio D/N.ltoreq.0.35;
• said corrugate lines defining a substantial meandering overlapping ratio D/L.gtoreq.0.5;
• said corrugate lines being formed without substantial wrinkling or breakage thereof in said x direction as a result of said corrugate lines having a width narrowing ratio i, equal to an amount of contraction of said sheet material in said y direction after formation therein of said corrugate lines to a width in said y direction of said sheet material in the form of a flat sheet before formation therein of said corrugate lines, .ltoreq.8% plus a stretch strain ratio of said sheet material;
• said width narrowing ratio i, said substantial amplitude ratio H/L and said meandering ratio D/N substantially satisfying a profile curve relationship such that the values of H/L and D/N change proportionally when i is changed;
• said waveform of each said corrugate line having crest and bottom portions spaced in said y direction, each said crest and bottom portion being curved or chamfered and having a relatively small dimension in said y direction;
• and
• a flat liner adhered to at least one opposite face of said corrugated body.