Composite foam material sandwich structure core material

When designing high-temperature foam manufacturers, the main factors considered for the panel are the strength and stiffness of the material, and for the core material, the main factor considered is the maximum weight reduction. In aircraft structures, aluminum honeycomb or foam is usually used as the core material. With the advantages of high compressive modulus and light weight, they are widely used as core materials for aircraft structures and are often used with carbon / glass fiber prepregs. Common structures include wing leading edge, rudder, landing gear hatch, wing body and wing tip fairing. Although the honeycomb sandwich structure has outstanding advantages over the metal sheet metal structure, airlines are still actively looking for alternative materials because the honeycomb sandwich material requires high maintenance and repair costs during use.

In some cases, if cracks and porosity occur in the panel, water and water vapor can easily enter the honeycomb. At low temperatures, the water entering the honeycomb pores will swell after being frozen, which will destroy the adhesion of adjacent honeycomb cells, which reduces the performance of the sandwich structure and must be repaired. The high-temperature resistant foam manufacturer introduced the maintenance cost of the honeycomb sandwich component, making the original light-weight advantage no longer exist compared with the foam core structure. Because the structural foam core is closed-cell, water and water vapor cannot enter the core, reducing The cost of maintenance and inspection, so the full life cost of the foam sandwich structure is more economical, although the weight of the foam is slightly heavier than the honeycomb when the same shear capacity is reached.

With a series of problems in the use of composite honeycomb sandwich structures, researchers in the aerospace industry at home and abroad have turned their attention to Low dielectric foam materials, mainly PMI foam materials. In sandwich structural members, the use of high-temperature resistant foam can reduce manufacturing costs and can also be used as a structural material. If only considered as a structural material, the design of the foam core sandwich structure and the honeycomb core sandwich structure are mainly at a disadvantage in terms of weight.