Carbon fiber car
Carbon Witt of applications in F1
Carbon fiber frame in carbon fiber Victoria is fired into polyacrylonitrile (PAN), PAN precursor (200-300 degrees Celsius air pre-oxidation) becomes flame fiber (800-1500 degrees inert gas under) becomes carbon fiber (2000-300 of inert gas) graphite carbon fibers, the carbon up to 98%, for the layered crystal structure similar to graphite epoxy resin (EPOXY RESIN) refers to a molecule containing two or more epoxy groups in the linear organic The polymer compound .CFRP three-dimensional network polymer matrix is made of crosslinked insoluble and infusible cured epoxy resin and hardener happen. In the early sixties, the Lotus team chief designer introduced Unibody in F1, carrying type body is surrounded by a sheet. This new technology to improve the robustness of the chassis of the car. In the late seventies, most commonly aluminum is used to make these bodies. However, these structures do not have enough proof to bring to bear wing downforce. John Barnard from carbon fibers tested and manufactured the first self-supporting chassis. McLaren's engineers asked the United States 'Hercules Aerospace' manufactured, because McLaren does not have enough material and knowledge to make this chassis in 1981, McLaren driver confirms this newly constructed security and superiority. John Watson won twice that season in the second and a first. Andrea De Cesaris proved many times from the season's collision of the Unibody sturdiness. F1 car is injected carbon fiber epoxy composite formation. First create a mold each part, good placement in the mold layer by layer carbon fiber, determined by calculating the number of the order and placement of carbon fiber injected ring epoxy resin, hollow autoclaving, formed after curing type.
Carbon fiber frame is a composite made from carbon fiber and epoxy resin, CFRP in, called the carbon fiber reinforced material, the resin matrix called the matrix material is determined by its own mechanical and chemical properties, and his features:
A high specific strength (strength density ratio) and the ratio of modulus (modulus, density ratio)
Making the same intensity frame, use CFRP (carbon fiber composite material) can be made very light mechanical properties of the following comparison of several common structural materials
Material density (g / cm3) Tensile Strength (Gpa) Elastic Modulus (Gpa) than the modulus of the intensity ratio
Steel 7.8 0.13 1.010 206 26
Aluminum 2.8 0.17 0.461 74 26
Titanium 4.5 0.942 112 0.21 25
CFRP two 1.45 1.472 137 1.02 95
CFRP a 1.6 1.050 235 0.66 147
Fatigue damage 2 good fatigue resistance of metallic materials in general there is no obvious sign is the sudden destruction, and CFRP has good fatigue resistance, there are obvious signs of damage before. Visible cracks appeared, still retains most of the strength, This greatly improves security.
3 broken good security CFRP cross-section there are thousands of individual fibers; even if some fiber breakage due to overload; load quickly reassigned to the unspoiled fiber; will not cause a complete loss of members at the moment carrying capacity fracture
4 damping ability CFRP modulus ratio; vibration frequency is high; less prone to resonance; CFRP is a non-homogeneous multiphase system; in between there are a lot of fiber and matrix interface; the interface of shock reflection and absorption effect; so strong CFRP vibration damping; make vibration attenuation soon
5 good high temperature performance carbon fibers can withstand 2,000 degrees Celsius, while the same strength, so CFRP as a whole depends on temperature epoxy matrix, various grades of heat resistant epoxy resin is not the same, help agents will have an impact.
6 good aging resistance of CFRP carbon fiber will be oxidized by oxygen in the air at 500 degrees Celsius, and he was fully protected up base. Epoxy matrix material by adding the appropriate additives aging resistance is also good. So CFRP car Mechanical damage will first frame, do not worry about his chemistry aging
7 can be designed strong fiber composite material is composed of two or more properties of a combination of different materials, his structure includes fiber, matrix and interfaces. These three aspects will affect the performance of CFRP. The CFRP fiber is carbon fiber, is to bear the load, and the matrix used to protect the fiber laying form, allowing the fibers to withstand compression and shear loads, distributed load transfer, and protect the fiber.