| 摘要 |
A variable geometry core structure consists of two sheets (12, 14). Each sheet is embossed with a series of beveled (24), truncated (26), hollow pyramids (20) and when mated in opposition along the bevels, provides an additional structure therein which forms a tetrahedron. The pyramid base vertex angles, face angles, truncations, bevel width and channel width, as well as wall thickness are variable although for ease of visualization each can be considered as a quadrilateral based pyramid of variable geometry that in the limit could assume the form of most solid shapes from a ''two dimensional'' triangle to a cone. The resulting core structure exhibits the features of both a stressed skin and truss type reinforcement combining to provide three dimensional stability in the core. The resulting core structure is then normally bonded to one or two additional sheets (16, 18) to form a smooth skin for the structure and provide additional strength and stability. Further provisions are made for ending the core in a continuous manner, change of orientation, mid-panel and corner attachment, aspects of continuation and, the capability to form compound curves of variable thicknesses in global shapes. Further variations are addressed to accommodate numerous types of materials and multiple layers of the core structure for added strength, insulation and flexibility of application. |
