Abstract: A composite element having a core and two face sheets attached to respective faces of the core. The core density varies along its length and, in turn, varies the element strength along its length. The core can include either a ceramic material or a urethane foam. The face sheet can include metals, a fiber reinforced polymeric material or a polymer matrix composite material. The element can take the shape of a beam, plate or shell and can be used in high pressure and high temperature applications. The composite element is particularly suited for aerospace applications.