Abstract: A flexible multi-material structure comprises a plurality of overlapping rings that form a generally circular shape perpendicular to a longitudinal axis of the structure; an internal compliant hollow frame having a circumference corresponding to the generally circular shape of the plurality of rings, the internal frame comprising: a plurality of connection clips wherein each connection clip is attached one of the plurality of rings, the internal frame and connection clips defining a longitudinal spacing between the plurality of rings, each of the plurality of rings is shaped to minimize contact with adjacent rings when the structure is articulated, each ring including a spherical profile along an aft interior region which nests with a forward outer region of an adjacent ring, wherein connections between the rings and the frame allows independent motion of the rings and frame, allowing each ring to pivot about a geometric center of the spherical profile.

Abstract: A flexible multi-material structure comprises a spring skeleton comprising a plurality of repeating cells, the cells filled with an infill material, wherein the spring skeleton is one of a machined spring structure and a wave spring structure. The spring skeleton may comprise one of steel and polycarbonate blends, and the infill material may consist of one or more of foamed and monolithic elastomers. The foamed and monolithic elastomers consist of one or more of silicones, polyether, and polyurethane. The Poisson ratio of the infill material is about 0.1 to 0.3. The repeating cells of the spring skeleton have a predetermined wall thickness (t), wall height (h), and revolution symmetry.

Abstract: A flexible multi-material structure comprises a plurality of overlapping rings that form a generally circular shape perpendicular to a longitudinal axis of the structure; an internal compliant hollow frame having a circumference corresponding to the generally circular shape of the plurality of rings, the internal frame comprising: a plurality of connection clips wherein each connection clip is attached one of the plurality of rings, the internal frame and connection clips defining a longitudinal spacing between the plurality of rings, each of the plurality of rings is shaped to minimize contact with adjacent rings when the structure is articulated, each ring including a spherical profile along an aft interior region which nests with a forward outer region of an adjacent ring, wherein connections between the rings and the frame allows independent motion of the rings and frame, allowing each ring to pivot about a geometric center of the spherical profile.