Known bicycle materials （8）

Carbon fiber (CERP)

Carbon fiber is "light of characteristics of frame, bending, shock absorption," but, give full play to the excellent properties of carbon fiber, technically looks not so easy, the carbon fiber materials quality difference between the manufacturers bigger also. Bicycle factory considering the cost, is unlikely to make use of high carbon frame. Although the realistic problem, but with other material or carbon frame have advantages, can make 8, about 9kg of lightweight carbon lightweight, this bicycle bicycle, the slope can reflect its advantages, smooth and refreshing slope. Not like some light alloy frame, the slope was a pull force.
Carbon fiber is put in the coagulation. Very light, but it is of directional materials (tensile strong but easily broken), so the thin layer USES overlap method to solve the defects. (the right picture) COLNAGO card of carbon fiber, 2 million multivariate) frame
Adopts the advantages of carbon frame
(1) can make light of the frame
Carbon fiber is put on the frame of the direction of stress and strength layered-over. Carbon fiber frame is very light, it is its density and strong tensile strength.
The giant is very light, carbon frame model of the 2000 1.2 kg heavy
(2) shock absorption
Carbon fiber used to make use of the false invalid movement, or special spring legs are used in various fields. Using its outstanding performance, absorbing shocks make no shock bike. If the frame is ELEVATED the SCOTT's famous. But every difference of quality between the manufacturers, some very hard, so this frame to know well after riding or not.
(3) can produce various shape frame
Carbon fiber is the basic method of forming, in the mold piece and then spread fiber into resin and burn solid. Can be made into any shape frame. If Y frame is famous TREK.
Adopts frame shortcomings. Carbon
(1) complex stress calculation
Carbon fiber is the frame constitute, its characteristic is tensile strength is strong, but cut weak intensity, processing to complex stress calculation (longitudinal rigidity, horizontal stiffness calculation according to the) and carbon fiber overlap. Processing technology manufacturers, should choose to have experience and reliable manufacturer's product is very important.
(2) difficult to change size
Due to make mould after forming, difficult to change size. Not more than the corresponding size order. Style
(3) aging?
Use resin will therefore aging? This is a subject, it is placed in the sunshine will gradually become white. Of course this phenomenon in relation to the manufacturer's technology. Had better not placed in the sunlight.

The mixture of metal (MMC) M2,

The mixture of metal material in aluminum with ceramic powder or fiber, make its objects such as separation, create strength of materials. It's a lot better, stronger than aluminum alloy is a new material. Some into alumina powder. M4 refers to join two kinds of alloy, more in this material made of frame shock absorption is better.
Responding to a mixture of metal matrix of the frame
(1) can make light of the frame
It and aluminum alloy, tensile strength, extremely thin pipe can maintain the strength, therefore frame is very light. This light is a rigid light.
(2) high rigidity
If the M2 SPECIALIZD frame makes people feel very strong, pipe diameter is big, rigid.
Responding to the mixture of metal frame faults
(1) welding
The little information about this, see the real welding bead is part of the normal, but every large-scale GUSSET. What is the purpose of reinforcing? Yet clear. Ceramic powder in aluminum matrix equilibrium existence, welding ceramic powders can balance is a very difficult thing scattered, what can obtain the mechanical strength is a concern, anyhow, the reinforcement is GUSSET has reached the level.
(2) shock absorption sexual difference
Regarding this point, many people have the same feeling, the front have shock so personal feeling, but there will be back very obvious difference, the impact is too big, can lumbago. This material is not suitable for long-distance riding the frame. But in the short time can play games.