abstract |
A CELLULAR MATERIAL FORM HAVING A CORE FORMED OF A PLURALITY OF CORRUGATED LAMINAR SHEET ELEMENTS, IN WHICH APICES OF CORRUGATIONS ON AT LEAST ONE SIDE OF A FIRST SHEET ARE NOTCHED TRANSVERSELY TO RECEIVE AND INTERLOCK WITH APICES OF THE CORRUGATIONS OF A SECOND SHEET PROVIDING A PLURALITY OF INTERCONNECTED OR CLOSED CELLS IN A LOW DENSITY CONFIGURATION WHICH FITTED TOGETHER UNDER COMPRESSION IS SEMI-RIGID OR IS RIGID AND OF HIGH STRENGTH TO WEIGHT RATIO WHEN APPROPRIATELY BONDED. |