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mountain bike wheels——application of carbon fiber in mountain bike
2016-04-08
Inherent in the intrinsic properties of carbon fiber mountain bike in carbon fiber (carbon fiber), as the name suggests, it is not only having a carbon material, and both soft workability of textile fibers, a new generation of reinforcing fibers. Compared with traditional glass fiber (the GF), Young's modulus which is more than three times; it is compared with Kevlar fiber (KF-49), not only its Young's modulus is about 2 times, and in an organic solvent acid, alkali insoluble and swelling, outstanding corrosion resistance. Some scholars in 1981, PAN-based CF soaked in alkali NaOH solution, the time has been the past 30 years, it has kept the fiber morphology. Carbon fiber is made from organic fibers carbonized and graphitized graphite-ceramic material obtained. Microscopic structure of the carbon fiber is similar to artificial graphite, is turbostratic structure. Carbon fiber is a superior mechanical properties of new materials, 1/4, carbon fiber resin composite tensile strength less than the proportion of its steel generally in 3500MPa above, it is 7-9 times that of steel, the tensile elastic modulus of 230 ~ 430GPa also higher than steel. Thus specific strength that is the strength of CFRP material is its density can reach more than 2000MPa / (g / cm3) or more, and A3 steel strength only 59MPa / (g / cm3) or so,
mountain bike wheels——application of carbon fiber in mountain bike
which is also higher than the modulus than steel. Higher than the strength of the material, the weight member is smaller, higher than the modulus, the greater the stiffness of the component, in this sense has been foreshadowed in broad application prospects of carbon fiber project. Carbon fiber is the carbon content of more than 90% of the inorganic polymer fibers. Wherein said graphite fiber carbon content higher than 99%. High axial strength and modulus carbon fibers, low density, high specific performance, no creep,
under a non-oxidizing environment, ultra-high temperature resistance, good fatigue resistance, non-metal and metal ratio between thermal and electrical conductivity between the thermal expansion coefficient and having a small anisotropy, good corrosion resistance, X-ray transmission is good. But its poor impact resistance, easy to damage, metal carbide, carburization and electrochemical corrosion phenomenon occurs when oxidized compound with a metal (such as aluminum) in a strong acid.
Therefore, the carbon fibers subjected to surface treatment before use. Carbon fiber can be processed into fabrics, carpets, seats, belt, paper and other materials. In addition to the traditional use of carbon fiber used as insulation materials, it is generally not used alone, and more as a reinforcing material added to the resin, metal, ceramics, concrete and other materials to form composite materials. Carbon fiber reinforced composite material can be used as aircraft structural materials, electromagnetic shielding materials except electricity, artificial ligaments and other alternative materials and the body shell for the manufacture of rockets, motor boats, industrial robots, automotive leaf spring and the drive shaft and so on. Around 1994 to 2002, with the academic research from staple fiber to carbon filament carbon fiber, the use of carbon fiber heating material technologies and products have gradually entered the military and civilian fields. China has been using carbon fiber filament State Grid cables multiple use cases. At the same time, the carbon fiber heating products, carbon fiber heating products, carbon fiber far infrared therapy products are also more and more ordinary people into the family.
Carbon fiber is dual-use of new materials, are technology-intensive and politically sensitive key material. Previously, the US-led Coordinating Committee (COCOM), the then socialist countries embargo embargo policy, in March 1994, COCOM although disbanded, but the embargo blocked shadow still hung over the advanced carbon fiber technology still
lead not come in, especially high performance PAN-based precursor technology, if China entered the WTO, the situation will not change much. Thus, in addition to self-reliant people continue the development of carbon fiber industry, but no other choice. Therefore, foreign countries, especially the export of carbon fiber production technology leader in Japan and South Korea and other countries on China's carbon fiber materials and products has remained fairly cautious, only a small number of Chinese enterprises to its partnership with import channels for their products.
Carbon fibers are widely used in civilian, military, construction, chemical, industrial, aerospace and super sports cars. Wherein in the civil construction sector: Carbon fibers are also used in industrial and civil buildings, highway and rail bridges, tunnels, chimneys, towers and other structures of the reinforcement, has low density, high strength,durability, strong corrosion resistance, acid , alkali and other chemicals, corrosion, good flexibility, adaptability and strong features. Carbon fiber tube production of roof truss girder frame, 50% lighter than steel or so, so that large structures reached a practical level, but also the efficiency of construction and seismic performance has been greatly improved. In addition, the structure made of carbon fiber reinforced concrete, the need to increase the bolts and rivets, small perturbations of the original concrete structure, easy construction process. Carbon fiber mountain bike in the application of carbon fiber is mainly used in the manufacture mountain bike frame.
Carbon fiber frame features are: light, steel is good, good shock absorption. However, give full play to the excellent performance of carbon fiber, it seems not so easy technically, the quality of the carbon fiber material differences between the manufacturers as well. Bicycle manufacturers consider the cost issue, unlikely to be used to produce high-grade carbon fiber frame. Despite these practical problems, but has the advantage of carbon fiber frame, or other materials that are not possible to produce a lightweight bicycle 8,9kg about this lightweight carbon fiber bike, climbing the hill when most can manifest its advantages, successfully climbing the hill and refreshing. And not as some light aluminum frame, while climbing the hill felt a pull back force.
Carbon fiber is the stuff of carbon fiber molding resin solidification. Very light, but it is a directional material (tensile strength but easy to break) has, therefore the use of thin layers of overlapping ways to address the shortcomings. Advantages frame (1). The frame can be made lightweight carbon frames is facing the direction of the carbon fibers is laminated to stress, strength is obtained. Carbon fiber frame is very light, which is its density and stronger tensile strength composition. ZGL carbon fiber frame is very light, is the first professional production of carbon fiber Bicycles and various spare parts company. Mainland China's first production of a carbon fiber bike manufacturers. Carbon fiber frame between 1-1.2kg. (2) The shock-absorbing carbon fiber used to good use when making prosthetic leg disability movement, or special spring is used in various fields. Using its excellent performance in absorbing impact, without making shock absorbers bike.
As SCOTT plant ELEVATED frame is known. But the quality difference between the various manufacturers of large, some very hard, so after this ride frame in order to know good or bad. Basic molding method (3) can be manufactured in various shapes frame carbon fiber is spread in a mold and then flows into the resin fiber sheets and baked. The frame can be made into various shapes. As TREK Y-frame is known. Frame disadvantage (1). Complex stress calculation constituting the carbon fiber frame is carbon fiber, which is characterized by strong tensile strength, shear strength but weak when processing requires complicated stress calculations (longitudinal rigidity, transverse rigidity),
according to calculate the carbon fiber sheet molding overlap. Processing technology manufacturers vary, you should choose an experienced and reliable manufacturers of products is very important.
Since it is difficult to change the size after prepare molding, it is difficult to change the size. Unable corresponding multi-size models of more orders. (3) Aging resin and therefore does not age? This is a problem exists, it will gradually turn white when it is placed in the sun. Of course, this phenomenon is related to the manufacturer's technical. Should not be placed in the sun. Carbon fiber frame Categories (1) All full carbon carbon fiber bicycle accessories all made of carbon fiber material. (2) Semi-carbon lot bicycle aluminum alloy + carbon fiber manufactured. For example, a frame, the tube may be made of carbon and other parts of the aluminum alloy (triangle using carbon or after ...), carbon fiber fork arm, fork tubes aluminum alloy, so it can be said that half of the carbon .
This article is edited by http://www.carbonwheelfactory.com/——carbon bike wheels,carbon road bike rims,carbon mountain bike wheelset,carbon fat bike rim and carbon fiber bike wheel manufacturer,factory,supplie and exporter——Xiamen Ekay Composites Technology Co., Ltd.
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