Reason 1: strength the main reason why people will consider using carbon fiber is its high stiffness and component ratio. Carbon fiber is very strong, very hard and relatively light. The stiffness of the data is measured by its elastic modulus. The modulus of carbon fiber is 34 MSI (234 GPA). The ultimate tensile strength of carbon fiber is generally 600-700 Ksi (4-4.8 GPA). It was compared with 2024-T3 aluminum with modulus of 10 MSI and ultimate tensile strength of 65 Ksi or 4130 steel with modulus of 30 MSI and ultimate tensile strength of 125 Ksi. Because of the refinement of data and the processing of carbon fiber, high and ultra-high modulus carbon fiber or high strength carbon fiber can also be used. Composite carbon fiber components are a combination of carbon fiber and resin (usually epoxy resin). The strength and stiffness of carbon fiber composite components will be the result of the combination of the strength and stiffness of fiber and resin. The size and direction of the partial strength and stiffness of the composite component are controlled by the partial fiber density and direction in the laminate. In engineering, it is typical to quantify the advantages of structural data according to the ratio of strength to component (specific strength) and the ratio of stiffness to component (specific stiffness), especially when component reduction is related to functional progress or life cycle cost decline. The flexure modulus of carbon fiber board made of plain carbon fiber with normal modulus and symmetrical 0 / 90 lamination is about 10. 10 MSI。 Its bulk density is about. 050 lb / in3. Therefore, the stiffness component ratio or specific stiffness of this data is 200 MSI. In contrast, 6061 aluminum has a flexural modulus of 10 MSI, a strength of 35 Ksi and a density volume of 0.10 lb. This will result in a specific stiffness of 100 MSI and a specific strength of 350 Ksi. 4130 steel has a stiffness of 30 MSI, a strength of 125 Ksi and a density of 0.3 lb / in3. This will result in a specific stiffness of 100 MSI and a specific strength of 417 Ksi.
Therefore, even the basic plain carbon fiber panel, its specific stiffness is 2 times greater than aluminum or steel. Its specific strength is five times that of aluminum and more than four times that of steel. When considering the option of customizing the stiffness of CFRP panels through strategic fiber placement, and the possibility of significantly improving the stiffness of sandwich structures including the use of lightweight core materials, the advantages of CFRP in a variety of applications are obvious. Detailed figures depend on the structure and the details of use. For example, foam core sandwich has a very high strength component ratio when it is tortuous, but it does not necessarily have tighten or crush. In addition, the loads and boundary conditions of any component are unique with respect to a particular structure. Therefore, without careful consideration of all planning factors, it is impossible to supply the thickness of carbon fiber board which can directly replace steel plate in a given use. An example of carbon fiber planning flexibility is the custom planning of beams with custom stiffness along a particular axis. To obtain the best stiffness along each flexure axis. Such tubes are similar to I-beams in bending resistance, but retain the high torsional stiffness found in tubes.
Reason 2: low heat expansion
An important advantage of choosing Inteli carbon fiber is its dimensional stability with temperature. The coefficient of thermal expansion of carbon fiber is less than one millionth of an inch per Fahrenheit, that of steel is seven millionths of an inch per inch, and that of aluminum is one millionth of an inch per inch.
Reason 3: anisotropy
When planning composite parts, it is not easy to compare the function of carbon fiber with that of steel, aluminum or plastic. These data are homogeneous (properties are the same at all points) and isotropic (properties are the same at all axes). In contrast, carbon fiber parts are neither homogeneous nor isotropic. In carbon fiber parts, the strength exists along the fiber axis, so the fiber density and direction greatly affect the mechanical function.
