Honeycomb sandwich structure refers to a laminated composite material with a lightweight core material sandwiched between two thin skins. In terms of function, it is similar to the I-shaped section beam visible on the rail. That is, the two flanges of the I-shaped section material correspond to the skin. Bear the bending stress. The web of the I-shaped cross-section material corresponds to the core material. Specially responsible for the yellow-cutting, each of the roles are clearly divided.
History of development
The concept of a honeycomb sandwich structure was created in 1920. In fact, the slats used in aircraft were constructed in 1939. In the future, the performance of the honeycomb sandwich structure was rapidly improved due to the development of metal, non-filament adhesives, advances in welding technology, and the emergence of lightweight materials such as FRP.
The honeycomb sandwich structure has great bending stiffness, which is the first advantage of the honeycomb sandwich structure. In addition, because it has a double structure, it is excellent in airtightness and heat insulation; because it is a bonded structure, the surface can be made smooth; the structure is attenuated, and the damage caused by the impact stays local, cracking It is difficult to expand, exhibit, etc.
The outstanding features of the sandwich structure are: high bending stiffness, full use of the strength of the material, and light weight. The honeycomb sandwich structure can be formed at one time, that is, the molding and curing of the upper and lower panels and the bonding and curing of the panel and the honeycomb core are simultaneously completed; or the secondary molding, that is, the molding and curing of the upper and lower panels and the curing of the panel core material are successively cured twice. It can also be formed three times, which is the assimilation of the upper panel, the curing of the lower panel and the curing of the core of the panel. When the aluminum plate is used as a panel, it is required to be surface-treated before bonding to improve the bonding strength.
The sandwich structure is widely used, such as airfoil, rudder surface, deck, wall, floor, radar claw, etc. It can also be used as a separator for trains, subways, cars, glass fiber composites or aramid composites. It is excellent for racing boats and cruise ships made of aluminum honeycomb core and aramid paper honeycomb core. It is also used in sporting goods such as water skis, surfboards and snowboards. Thick thick honeycomb sandwich structure can be used as building wall panel, with good sound insulation and heat insulation effect