Abstract: A cross-corrugated panel has a core between two faceplates, where the core omprises two groups of corrugated elements that are perpendicular to each other. The corrugated elements have peaks and troughs connected by diagonally-extending segments. In each group of corrugated elements the peaks and troughs in adjacent elements are 180 degrees out-of-phase with each other. The faceplates and the corrugated elements in each group are joined at the peaks and troughs. The diagonally-extending segments of one of the elements comprise flat strips whose flat surfaces are parallel to each other and perpendicular to the faceplates. To make a cross-corrugated panel, a first group of elements is provided, each element being formed by oppositely winding two strips of curable material to form overlapping helixes having rectangular cross-sections. The elements are positioned in parallel. A second group of elements of curable material is placed perpendicular to the first group of elements.

Abstract: A bi-directionally corrugated sandwich construction for use in applications equiring high-strength, light-weight components is disclosed. The sandwich construction comprises first and second face sheets positioned essentially parallel to and spaced apart from each other and having a core therebetween. The core has two sets of corrugated strips which have planar peaks and troughs positioned at regular intervals. The strips of the first set are positioned parallel to and spaced apart from each other with the peaks and the troughs in phase with each other such that parallel rows of troughs are formed perpendicular to the strips. The strips of the second set are positioned parallel to each other with the peaks and troughs in phase with each other, and are positioned perpendicular to the first set of strips in the rows of troughs formed thereby.

Abstract: A novel form of sandwich construction is disclosed. The lattice core sandh construction comprises of elongate lattice cells in side-by-side abutment, to present common, lengthwise flat sides that have facesheets co-cured thereto without any secondary bonding. Each lattice cell is formed by wrapping, in alterate patterns, fiber-reinforced, composite bands around commonly-shaped mandrels. Opppositely disposed face sheets are placed against flat sides and the construction co-cured. After co-curing, the mandrels are removed.

Abstract: A novel form of sandwich construction is disclosed. The lattice core sandh construction comprises of elongate lattice cells in side-by-side abutment, to present common, lengthwise flat sides that have facesheets co-cured thereto without any secondary bonding. Each lattice cell is formed by wrapping, in alterate patterns, fiber-reinforced, composite bands around commonly-shaped mandrels. Opppositely disposed face sheets are placed against flat sides and the construction co-cured. After co-curing, the mandrels are removed.

Abstract: A method for making an offset corrugated core sandwich construction is diosed. Mandrels of preestablished form and size are arranged into a pattern in a confined area. After covering the mandrels with a release film, strips of pliable, uncured composite material are arranged in a "peak-to-valley" pattern with adjacent strips being out of phase by 180 degrees. Selected mandrels are replaced by a granular mixture and top and bottom face sheets are fitted to the arrangement. After curing, all mandrels are removed from the construction.

Abstract: A sandwich construction is disclosed that provides alternating offset and jacent corrugated strips secured between upper and lower face sheets. The peaks of one strip are adjacent the troughs of an adjacent strip. The peaks and troughs can have flattened portions and the face sheets can be secured to said portions.

Abstract: A corrugated panel having a core between two faceplates where the core and aceplates are comprised of curable material and where the core is comprised of undulate strips that are disposed in parallel relation to each other. The strips define peaks and valleys connected by diagonally-extending segments that have non-planar cross-sections. The peaks and valleys in adjacent strips are 180 degrees out of phase with respect to each other. The faceplates and the strips are joined at the peaks and valleys.A method of making a corrugated panel assembly comprising the steps of providing upper and lower faceplates and a core of strips, all made from curable material. Mandrels and inserts are used to form the strips into alternately-arranged peaks and valleys that are interconnected by diagonal segments where the diagonally-extending segments have non-planar cross-sections. The strips are 180 degrees out of phase with respect to each other. The mandrels are replaced by granular particles and the assembly is cured.