Preparation And Performance Analysis Of Carbon Fiber Cable

For now the first choice for building long-span bridges to connect two sides over long distance is suspension bridge, which is required to be longer span, larger bearing capacity, higher dynamic stability and durability. This is a challenge for traditional steel cable in strength, fatigue resistance, corrosion resistance and so on, while it has been limited in span extremity and bearing capacity for its own density.The weight of bridge is 70% of the total bearing taken by steel cable in usual span-bridge. however, the tensile stress of carbon fiber reinforced plastic only come to 20% of steel cable with the same cable length, tangle and ropecurve, which means carbon fiber cable's effective capacity could be 80% higher. so it is better for super span bridge to replace steel with carbon fiber cable to improve the ratio of random capacity.Carbon Fiber Reinforced Plastic is shorted as CFRP. CFRP cable is possible to be a new material for long-span bridge cable with smaller ropecurve, less density, higher Equivalent Elastic Modulus, longer span extremity, larger bearing capacity, bigger natural frequency of vibration compared with steel cable under the same situation. but it also has weak point as lower breaking elongation which may cause sudden breakage in one place, as a result searching for methods to solve this problem is very important.This subject plan to change carbon fibers'shape inside of CFRP cable by using several braiding methods in order to increase elongation; take these cable to test their tensile stress, figure out breaking strength and breaking elongation, finally analyze the result to decide whether this plan is applicable or not. First give up twisting and select rope braiding and three dimensionally braiding for preparation. Second, as there is no unit or suitable test instruction, here design two set of auxiliary assembly, find a successful process to protect samples, and give out ideal test result. Their mean value, standard deviation and stress-elongation curve shows this plan is applicable and it is more advisable for CFRP cable industrialization production.