What is Honeycomb Composite? Properties, Application Areas
The honeycomb structure used in composite manufacturing is formed by joining the cells obtained from the shaping of very thin layers. The honeycomb has received the name because these structures are similar to the honeycomb naturally made by honey bees. The honeycomb structures are formed by joining the core structure between the upper and lower layers with the help of an adhesive. The honeycomb composite structures started to be used in the aviation sector after about 1940 on the aircraft chassis panel.
What is Honeycomb (Honeycomb) Structure for?
The conditions and environment in which the material is to be used are the criteria that determine the properties that the material to be used must possess. Among these criteria; fatigue, creep, temperature, environment, corrosion, rigidity, strength, lightness, human and cost factor. But the most important issue in air vehicles is weight, so there is a need for light constructions such as honey pellets.
It is used where the weight/strength ratio of honey pile structures is important (such as automotive, railway, air tools). At the same time, they are used to absorb energy in collisions. For example, honeycomb structures used in the fronts of high-speed trains and automobile chasers are used to remove the negative aspects of the win as a passive safety system in reducing injuries in protecting the lives of passengers and drivers,
Axes and openings are always horizontal. Since the core is hexagonal, the smallest surface ensures that we get the widest coverage on the screen. That is, at the point where the surface material joins, the surface area is wider although the plate contact surfaces are less. In this view, the hexagonal structure is used with little material and the desired cage structure is obtained.
Honeycomb Structure Lower-Upper Layer
The main task of the lower and upper layers is to provide bending and shear resistance. The lower upper layer is made of aluminum steel, stainless steel, carbon/epoxy, glass fiber/epoxy, aramid/epoxy, plywood, paper. Generally, the upper layer is used in the same works. Different surfaces cause different surface expansion due to different expansion coefficients.
Today, a wide variety of core structures are used. It is the part that meets the basic mechanical behavior in honey pelagic structures. The cores in the honey kinetic constructions have different combinations (hexagonal, square, rectangular, zigzag, ellipsoid, egg branch, etc.), hollow, solid, different materials (foam, aluminum, balsa tree, copper, paper, epoxy, etc.) (bonding, molding, etc.). In the picture at the bottom, different core structures are visible.
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How to Produce a Honeycomb Structure?
The honey is usually made hexagonal in the honeycomb structure. At the connection points, the adhesive means and the parts forming the core are connected. The use of honey pheasant sandwich structures has become widespread with the perfecting of the bonding of the core material to the upper and lower surfaces.
As the number of cells per unit area in the core structure increases as the connection thickness increases, the strength of the core structures against bending, pressing, peeling, cutting and impact forces increases. The behavior of core structures against shear stresses is weak. The shear stress is increased by changing the number of cells and the upper and lower layers.
Production Methods of Honeycomb Constructions
Metallic honeycomb structures are generally produced by crimping or lengthening. In the method of curling, the strips are curled in the required size and are formed by stacking the adhesive on the knot points. In the extrusion method, the application of the adhesive of the core material in the rolled state is formed by stacking the material in the rolled state and then cutting and drawing it at the desired thickness. Materials such as adhesives or burrs which remain in the construction at the end of production should be cleaned before use. Not producing composite materials; hot press method, vacuum method and die production method.
Honeycomb Application Areas
Honeycomb Core and Honeycomb Panels are lightweight; stadiums, sports halls, convention centers, airports, high-speed trains, metros, ships, yachts, boats, caravans, prefabricated buildings, industrial buildings, aerospace, marine, and space industry, etc., where weight is a critical problem and at the same time high strength and stiffness are required. It has endless usage areas such as housing, container, mantle, packaging industry, furniture industry, wall panels, interior decoration, suspended ceiling, roof panels, disabled ramps, portable ramps, clean room and so on.
It is a high-tech material with high resistance to chemicals, resistance to fire, delay and damping effect, heat, sound, and acoustic insulation, high impact, delamination life, bending, compression, wind resistance, corrosion mold, fungus, and bacteria formation. The classical decoration is striking as the most important element that increases the weight of materials or gates such as doors, panels, furniture produced with wooden, steel or aluminum applications.