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A three-dimensional structure adapted for use for instance as a core in sandwich panel-type construction, and comprised of substantially continuous unbroken sheet material to which has been imparted an alternating sequence of ridges and valleys, creating spaced rows of adjacent inclined rectangular-

A three-dimensional structure adapted for use for instance as a core in sandwich panel-type construction, and comprised of substantially continuous unbroken sheet material to which has been imparted an alternating sequence of ridges and valleys, creating spaced rows of adjacent inclined rectangular-shaped facets connected by intermediate rows of adjoining parallelogram-shaped facets. The core structure provides substantially gridlike bearing surfaces on two opposing parallel bearing planes thereof to which face sheets may be affixed, to form a sandwich panel.

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A three-dimensional structure comprising an alternating sequence of essentially linear ridges and valleys which demarcate spaced rows of generally rectangular-shaped facets connected by intermediate rows of non-rectangular generally parallelogram-shaped facets, wherein said structure is foldably for

A three-dimensional structure comprising an alternating sequence of essentially linear ridges and valleys which demarcate spaced rows of generally rectangular-shaped facets connected by intermediate rows of non-rectangular generally parallelogram-shaped facets, wherein said structure is foldably formed from a continuous unbroken sheet material wherein said sheet material has a surface area, said surface area being filled with a repeating pattern of unit cells, each said unit cell comprising: a first pair of generally rectangular-shaped facets, each said facet having first, second, third and fourth sides, said first and third side and said second and fourth side of each facet being opposing, such that the third side of the first of the pair of facets coincides with the first side of the second of the pair of facets, the respective second sides and fourth sides of the pair of facets being colinear; a first pair of non-rectangular generally parallegllogram-shaped facets, each said facet having first, second, third and fourth sides, said first and third side and said second and fourth side of each facet being opposing, such that the angle between the first and second sides is an acute angle and the third side of the first of the pair of facets coincides with the first side of the second of the pair of facets, the respective second sides and fourth sides of the pair of facets being colinear, the colinear fourth sides of the first pair of parallelogram-shaped facets being coincident with the colinear second sides of said first pair of generally rectangular-shaped facets; a second pair of generally rectangular-shaped facets, each said facet having first, second, third and fourth sides, said first and third side and said second and fourth side of each facet being opposing, such that the third side of the first of the pair of facets coincides with the first side of the second of the pair of facets, the respective second sides and fourth sides of the pair of facets being colinear, the colinear fourth sides of the second pair of generally rectangular-shaped facets being coincident with the colinear second sides of said first pair of generally parallelogram-shaped facets; and a second pair of non-rectangular generally parallelogram-shaped facets, each said facet having first, second, third and fourth sides, said first and third side and said second and fourth side of each facet being opposing, such that the angle between the second and third sides is an acute angle and the third side of the first of the pair of facets coincides with the first side of the second of the pair of facets, the respective second sides and fourth sides of the pair of facets being colinear, the colinear fourth sides of the second pair of parallelogram-shaped facets being coincident with the colinear second sides of said second pair of generally rectangular-shaped facets. *** BRS DOCUMENT BOUNDARY ***