Foam composite material

#Foams may be used for many different purposes including cushioning to avoid damage, and structural reinforcement. However, foam materials have conventional and well-known properties. New chemical formulations of foam, and/or fillers within the foam, are often being formed. A combined foam may chemically mix multiple materials to form a new foam.

#The present application teaches a mechanically combined foam, formed of foam materials which are combined on a mechanical level. A special kind of composite foam is formed.

#According to the present system, various kinds of foams, including polymer foams, metallic foams, and other foams may be mechanically combined to provide materials with different properties.

#Sound waves reflect off concrete walls, isolating the signal from the region behind the back surface. The mismatching of densities and Young's Moduli between the air and wall often cause this reflection. Using this technique, hybrid foams uniquely fit a sound absorbing model. They have the ability to intimately combine foams of vastly different density and moduli. The total hybrid panel or core shows a repetition of such mismatches within its thickness.

#Open Cell/Closed or Open Cell:

#Currently, the commercial aerospace industry is looking for new foam cores to be placed in sandwich panels. The foam cores being used now are expensive or flammable. These low-load applications are located within the interior of the plane. Phenolic foam exhibits the lowest flammability and toxicity of any foam. It also has excellent thermal insulation and a low price. But alone, phenolic foam is not tough enough for sandwich panel applications because of its extremely low peel strength. A polyurethane/phenolic hybrid overcomes this by transferring the peel stress from the brittle phenolic portion to the stretchable reticulated polyurethane structure.