Aluminium honeycomb

A core material formed from thin walls arranged into an array of hexagonal or similar cells, used on edge between face sheets so the cell walls carry compression and shear. It offers very high stiffness and strength for its weight, with common types made from aluminium foil, resin-coated aramid paper and thermoplastics.

Honeycomb core manufactured from aramid paper coated with phenolic resin, producing a light, tough, non-metallic core with good fire resistance and electrical insulation. It is widely used in aircraft interiors and secondary structures, motorsport panels and marine interiors.

Compressive collapse of a sandwich core, occurring either in service under concentrated loads or as a manufacturing defect when autoclave or press pressure drives the core inwards, typically at chamfered panel edges. It leaves a dished or wrinkled panel and reduces the structure's load-carrying capability.