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Polyethylene fiber or make bicycle lighter and stronger

2016-10-28

 

DSM company recently on rubber and plastic fair in Germany, shows a use of ultra-high molecular weight polyethylene composite (Dyneema Carbon) of the bike, the car is also the spokes of the ultra-high molecular weight polyethylene Carbon fiber materials. DSM company recently declared, has been in the bicycle brand sales of ultra-high molecular weight polyethylene carbon fiber material, high strength, thin, flexible polyethylene materials will soon be used on the bike.


And this time node, perhaps in 2018 years.

(DSM), a prototype of this road car frame and fu article adopts Dyneema Carbon building)


Is the DSM Dyneema company of ultra-high Molecular Weight Polyethylene materials Ultra - High Molecular Weight Polyethylene (UHMwPE), simple is a kind of Ultra High strength plastic. Dyneema is widely used in aviation, navigation and sports industry. In the bicycle industry, SPECIALIZED, Castelli, Exteondo brands have application of ultra-high molecular weight polyethylene material in cycling shoes, or his/her jersey for the, improve the product properties, such as wear-resisting, durable.


Ultra-high molecular weight polyethylene of low melting point, good impact resistance performance. Its outstanding characteristic is inseparable with its extremely high molecular weight. In general, only the average molecular weight greater than 1.7 million ultra-high molecular weight polyethylene resin, what is the conventional molecular polyethylene does not have, other incomparable excellent properties of engineering plastics. Therefore, people usually call the average molecular weight of more than 1.7 million polyethylene ultra-high molecular weight polyethylene.


(Specialized S - Works 6 road cycling shoes gray part adopts the material of Dyneema)


Ultra-high molecular weight polyethylene material with high specific strength, modulus and ratio, strength of steel 15 times, after super than modulus carbon fiber; But only 0.97 g/cm3 density (54%) of carbon fiber, than the density of water (1 g/cm3), can float on the water. Low elongation at break, rupture work, has the strong ability to absorb energy, thus has outstanding impact resistance and cutting resistance (wear-resisting degree is high. And the intensity of carbon fiber material is 10 times as much steel and average density is about 1.78 g/cm3.


Traditional carbon fibre material, the stiffness, strength, lightweight, etc all have very good performance, but in shock resistance is short board, carbon fiber configuration is more difficult to control the shock of the problem. And ultra-high molecular weight polyethylene material, has excellent performance in resistance to impact, in body armour, shield and so on are widely applied in the military equipment; Just can make up for the traditional carbon fiber board in this respect, and density are lower than those of traditional carbon fiber material, lighter.

(Dyneema is very strong plastic fabric, Dyneema Carbon has stronger than conventional Carbon fiber shock resistance)


DSM company will cooperate with several bicycle company, development is suitable for the bicycle using ultra-high molecular weight polyethylene carbon fiber material, will increase in the carbon fiber material, ultra-high molecular weight polyethylene for carbon fiber has better shock absorption performance, and shock resistance. DSM even claim that it will ultra-high molecular weight polyethylene material in carbon fiber, will increase 100% of the energy absorption performance - whether future classic cars, no longer so struggle to get various suspension design? And the addition of ultra-high molecular weight polyethylene material, for bike will undoubtedly increase a layer of body armor, is a very good news for mountain bike!


Seems to ultra-high molecular weight polyethylene material, however, is not suitable for directly used in the manufacture of frame, combined with carbon fiber is a good solution. Because it itself has insufficient 3 points:

(1) not resistant to high temperature. Only about 150 ℃, the melting point of PE is not suitable for use at high temperature;


(2) fiber creep resistance is poorer, continued to stress prone to deformation under the action of inappropriate continued stress under the condition of use;


(3) because the structure has the chemical inertness, low surface polarity, adhesive performance is poorer, with other materials used in composite materials is difficult.


The melting point of 150 degrees as the frame, the temperature is slightly a little low. And (2) the lack of points, make directly USES the ultra-high molecular weight polyethylene made frame, what might seem to frame into the "transformers"!


High-performance materials to join, to improve performance of carbon fiber has a "precedent"

This example is the graphene.


Graphene (Graphene) is the most thin and the strongest two-dimensional material, breaking strength is 200 times higher than steel. At the same time it has a steel 6 times of elasticity, tensile rate can reach 20% of the size of itself. It is currently the most thin, high strength of material nature, if use a piece of area of 1 square meters of graphene make it a hammock, itself weight less than 1 mg can bear the weight of 4 kg. Density is 0.77 mg/m2 (temporarily didn't understand how to set the weight of the 2 d unit into 3 d).


Vittoria carbon fiber wheel after joining the graphene, up by more than 10% of heat dissipation, reduce weight, more than 15% of the materials increase more than 26% of the material strength, increase more than 18% of the impact resistant ability, the strength of more than 20% of the spoke hole, more than 24% of the toughness and more than 50% of the lateral rigidity.


Review:
Combined with the lower density of ultra-high molecular weight polyethylene material, there is no doubt that can let the carbon fiber frame become lighter and stronger. If combining graphene, personally think that bicycle should be able to have higher performance improvement. Of course, this is team!

Based on the current material of carbon fiber technology, cycling in the use of carbon fiber performance has been very mature; But as a composite material, the combination of the carbon fiber with higher performance materials, have more space to play. Expected, ultra-high molecular weight polyethylene material in the future after joining, is expected to see more lighter, stronger mountain bike works; At the same time also can have more more comfortable high-performance highway road.


Although dare not expect of ultra-high molecular weight polyethylene composite bicycle 46% of weight loss, but 10% 15%, it is possible. The key, or shock resistance and shock absorption performance of ascension.
In the progress of science and technology, ultra-high molecular weight polyethylene carbon fiber will bring the bicycle industry how to progress? Wait and see!

以前 :A carbon fiber "refined" world-class strength

:Carbon fiber knitting frame will come out in 2018 or will open a new era

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