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Jinlian sealing strip manufacturer's test description on the mechanical properties of composite materials

by:Kenna     2021-03-27
The material properties of the sealing strip manufacturer are also called engineering constants. There are 11 in total, which are the most basic parameters required by the classical laminate theory to characterize the properties of composite materials, and they can be well applied to thin plates. In practical engineering applications, it is also necessary to characterize the changes in the properties of the above materials under ambient temperature, humidity and other conditions. In addition to engineering constants, there are some test methods that can obtain the tensile (or compressive) modulus of elasticity in the third axis direction. Single-layer properties such as strength and strength are the cornerstones of design analysis. In engineering, the characterization of the basic material properties of composite materials is the characterization of single-layer performance, and a large number of single-layer properties are obtained through experiments on unidirectional plates. The so-called unidirectional board is a special laminated board made up of several single layers in the same direction. This kind of test has formed a variety of different versions of the standard. Conventional laminates generally contain 3 or more types of layup angles, the most commonly used angles are 0, 90, ±45°, etc. (Laminates that only contain the above 3 angles are also called n/4 layers Plywood]. This kind of laminate has a relatively balanced ability to withstand loads in all directions in the plane. The direction, number of layers and the ratio between the angles of the sealing strip manufacturer depend on the actual load. In fact, how to lay different angles, Proportion and number of layers to obtain the best performance of the composite material laminated structure to meet actual needs is an important content of structural design. With the help of classic laminate theory, continuum mechanics and finite element method, it can help designers better Establish the relationship between the basic properties of composite materials and the performance of the laminated structure. In order to avoid structural and technological deformation problems, laminates commonly used in engineering often adopt a paving plan with a specific symmetry plane, which is the so-called balanced and symmetrical Laminated form. 115 The properties of composite materials are closely related to the material form. The mechanical performance test and data processing methods of composite materials are closely related to the material structure. It is difficult to find a universal method to adapt to all types of composite materials. For example, continuous fiber The test methods and data processing methods of reinforced composite materials and chopped fiber or particle-enhanced composite materials may be quite different, because the former has obvious anisotropic characteristics and has obvious performance advantages in the fiber direction, while the latter can be seen Quasi-isotropic materials. Therefore, when discussing the performance characterization methods of composite materials, the basic characteristics of the materials must be fully considered. It is meaningless to discuss the stretching, compression, shearing and bending of the materials without the basic characteristics of the materials. Therefore, it is necessary to fully consider the loading direction, material properties and elastic principal axis direction. There are many kinds of fiber materials used in composite materials, and new varieties are constantly being added. At present, glass fiber, carbon fiber and aramid fiber are the most widely used. In addition to the continuous fiber application, the sealing strip manufacturer also has chopped fiber. This chopped fiber state is generally not used for the main load-bearing structure. Two-dimensional or three-dimensional woven structure is also a more commonly used form of reinforcement 1) Glass fiber Glass fiber is made of silicates containing various metal oxides, which are melted and made by spinning. The final composition of glass fiber is a mixture of various metal oxides and silica, which is an amorphous ionic structure substance. According to the content of alkali metal oxide in the chemical composition, it can be divided into: ①Alkali-free glass fiber, the content of alkali metal oxide is less than 1%; ②Low-alkali glass fiber, the content of alkali metal oxide is 2%~6%; ③Medium-alkali glass fiber, the content of alkali metal oxide is 6%~12%; ④With alkali glass fiber, the content of alkali metal oxide is more than 12%. Glass fiber has the following characteristics: ①The sealing strip manufacturer has a higher tensile strength, but a lower modulus. The failure is brittle, and there is no obvious yield. ②The heat resistance is better in the operating temperature range. ③Good thermal physical properties, low thermal conductivity, is a good thermal insulation material, and low linear expansion coefficient. ④Good resistance to acids (except hydrofluoric acid), alkalis and various organic solvents. It is an excellent corrosion-resistant material. ⑤Good electrical insulation properties, at 10H, Eu003d643, dielectric loss angle tan 0.0042, at 101H, u003d611, dielectric loss angle tan 0.006. According to the conditions of use, different types of glass fiber can be selected. Commonly used are: ①sealing strip manufacturer, alkali-free glass fiber; ②C glass fiber, acid-resistant glass fiber; ③S-glass fiber, high-strength glass fiber; ④G2 glass fiber, alkali-resistant glass fiber; ⑤M glass fiber, high modulus glass fiber.
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