Composite material

A composite structural material assembly comprising two planar face sheets separated by at least one undulating surface corrugated medium, said face sheets being attached to said medium along respective outside planes of corrugated flute ridges, the improvement comprising oriented structural fiber integrally attached to said medium so as to follow the undulating surface of said corrugated medium at an approximate orientation of 15.degree. to said respective flute axes.

A method of fabricating a structural composite comprising the steps of corrugating an oriented fiber containing sheet to form parallel, elongated flutes extending approximately 15.degree. from the oriented fiber direction and bonding a planar liner sheet to flute ridges on at least one face of said corrugated sheet.

A corrugated paperboard container comprising an undulating surface, corrugated medium element laminated to a planar facing sheet element along corrugation flute ridge lines, wherein structural reinforcing fibers are integrally attached to said corrugated medium element so as to follow the undulating surface thereof with a longitudinal orientation of said fibers disposed at approximately 15.degree. from corrugated medium flute axes.