1. Basics and properties of composite panels
Composite boards generally use hard materials as the surface layer and low-density materials as the core. The former is used to increase the strength, and the latter is used to increase the thickness and stiffness of the board, and has both thermal insulation properties. The surface layer of the hard material can be engineering plastics or metal materials, and the core layer is generally a lightweight material.
(1) Performance comparison and stiffness calculation method of composite slab structures.
Figure 1 lists the performance comparison and stiffness calculation formulas of several composite panels. It can be seen from the figure that the rigidity of the three-layer composite board is much higher than that of the solid material under the same board weight. The figure also lists the stiffness calculation formula of the three-layer composite board and different combinations of aluminum-plastic panels and aluminum alloys. Quality of stainless steel and engineering plastic sheets in different layer thickness combinations.
(2) Thickness and quality of different combination series of aluminum-Pt plastic-aluminum composite panels.
Figure 2 shows the comparison of 3 kinds of composite aluminum composite panels and 3 kinds of solid materials. It can be seen from the figure that the weight reduction effect of the composite board is much better than that of the solid material.
(3) The performance comparison of the two types of composite panels.
The performance of the composite board is very different due to different material combinations and different thickness combinations. The performance comparison is shown in Figure 3. It can be seen from the figure that the performance of the aluminum-plastic board is greatly improved compared with the plastic-plastic board. Each thickness combination is different, and the performance is also different. Therefore, when choosing a composite board, it is necessary to fully understand the material combination and thickness combination of the composite board. has performance. In addition to the mechanical properties, the composite board also has thermal insulation, heat insulation and corrosion resistance properties. When there are special requirements, the composite board should also have fire protection and other special properties.
(4) The stiffness of the composite board.
In the design and use of structures, in addition to strength requirements, more emphasis is often placed on stiffness requirements. The advantage of composite panels is also to increase the stiffness of the material. The stiffness calculation method and example of the composite plate and the stiffness comparison with the solid metal plate of equal mass are shown in Figure 4. Due to the increase of tc, the bending stiffness and shear stiffness are greatly increased. For example, when tc is increased from 10mm to 30mm, the bending stiffness is increased to 8 times, and the shear stiffness is increased to nearly 3 times. If it is a closed central control profile , will greatly increase its torsional stiffness.
2. Aluminum-plastic composite version
(1) The structure and application of aluminum composite panel.
The aluminum-faced plastic core board is called aluminum-plastic composite board, as shown in Figure 5, and there are already commodity supplies in the market. The structure of the aluminum-plastic panel is a new type of material that is processed and compounded by a series of processes, and can be widely used in various buildings. In terms of decoration, in developed countries, aluminum-plastic panels are also used as sound insulation materials for automobile and train body manufacturing, aircraft and ships.
(2) The characteristics of the material of the aluminum composite panel.
The characteristics of the material of the aluminum composite panel are ① economy. Cost-effective, good self-cleaning, just use cleaning agent and water, after cleaning, the board will be permanently as new. ②Durability. Fluorocarbon coated aluminum composite panel has the characteristics of durability, weather resistance, high temperature resistance, wear resistance and pollution resistance. ③ Lightweight. The aluminum composite panel is made of aluminum alloy and high-quality plastic, which is much lighter than other decorative materials, reducing the burden of material quality, convenient construction and short construction period. ④ Ease of processing. It is easy to cut, cut, ditch, bend into arc angles and other shapes, and can design and manufacture products of various shapes. ⑤ Fire resistance. The outer aluminum box of the aluminum composite panel can protect the polyethylene core material and has a certain heat insulation and flame retardant function. ⑥ Environmental protection. The surface layer does not change and does not pollute the environment. ⑦ High strength. The use of high-quality surface aluminum has high strength, which greatly improves the strength of the aluminum-plastic panel, and has compressive, shock-proof, leak-proof, lightning-proof and impact-resistant properties. ③ Flatness and richness of color. Flat surface and a variety of color options can meet the designer’s high-quality design to achieve perfect decorative effect.
(3) Typical products of aluminum composite panels.
Its main technical parameters are shown in Figure 6, the surface coating is fluorocarbon resin (PVDF), polyester resin (PET) and other imitation marble, imitation wood grain surface; fire retardant core material is high pressure low density polyethylene (PE), etc. , special sizes and colors and specifications can be customized according to customer needs. It can be seen from the performance parameters and characteristics in the figure that the aluminum composite panel can be used in many aspects, with light weight, low price, good quality, easy processing and easy cleaning.
(4) Application and promotion of multi-layer composite boards.
Aluminum-plastic composite panels are not only used in building walls, but also in car body skins, tables and chairs and furniture in cars. Aluminum-plastic composite panels can also be used, so that multi-layer composite panels can play an important role in vehicle weight reduction and cost reduction.