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Aluminum honeycomb core material has outgrown the experimental stage and is used on production structures. The combination of aluminum facings, aluminum core, and a specially developed adhesive results in a structural material with desirable high strength and rigidity characteristics. The advantages of the aluminum honeycomb core material are uniform density, high specific strength, high shearing modulus, and resistance to environmental effects with constant strength under variable humidity and temperature conditions.
The strength of aluminum honeycomb core varies directly with the density of the core regardless of the various combinations of cell sizes and foil thicknesses. Standardization of cell size has resulted in volume production of core material and increased applications. Proper design and fabrication process control are required to achieve satisfactory results. An impressive variety of aircraft parts has been made of aluminum core and recent trends indicate that an increasing percentage of new airframe designs are utilizing aluminum honeycomb sandwich construction.
Pajak, T. P.
Head, Sandwich Structures Unit, Materials Laboratory, The Glenn L. Martin Co., Baltimore, Md.