The Manufacturing Of The CF Composite Transmission Shaft

With the development of the raw and materials, mature of molding technology, reduction of the cost, the composite material has more and more widely used in civil industry. The 21^st Century should be the era of composite material composite time.The traditional drive shaft of the plane, steamship, automobile, water pump and cooling tower etc. is manufactured by metal. The metal shaft is of many merits, while on the other hand, it also has many weak points such as: heavy weight, inconvenient in assembling and disassembling of assembly and disassembly, difficult to process, long manufacturing cycle, inefficient production. Nowadays, industry is constantly looking for a way of reducing the weight of the material and increasing the effective load. Therefore, the resin matrix composite with high strength, high modulus will perform more and more important role day by day.Aiming at the contract index （see the table below） naval ships research unit brought forward according to the overseas CF transmission shaft’s index, This paper studied and designed the composite transmission shaft, doing a series of the composite transmission shaft’s analog of dynamo and analysis of performance by using Ansys finite soft.Also we did a series of composite’s moulding technics and tested the performance of the winding production. The result showed that it is accordant to the design request. So we put across the contract’s task. At the same time, the paper studied and designed the pontes’ structure （metal-CF flange）, did a series of FEA （finite element analysis）.This paper studied and designed the integral composite transmission shaft with metal flange, doing a series of the composite transmission shaft’s analog of dynamo and analysis of performance by using Ansys finite soft. The content of the research includes the following aspects:（1） Taking the the design needs, the development of the material’s market and the performance/price ratio into consideration, thus make a choice among raw materials of composite material. The T700S/epoxy unidirectional composite plate is preparedand its properties are tested according to the GB test methods.（2） Based upon the classical laminate theory, the Matlab is progammed, and the stiffness of the unidirectional composite and antisymmetric laminates is analyzed. Based on the composite’s strength theory, the paper modified the ultimate strength calculating method combined with the transmission shaft’s actual torsion load. Modified the theoretics that applying the strength value when half plies failure to be the ultimate strength. Using the modified theoretics studied the strength of the antisymmetic laminate variational relationship with the winding angle.（3） Because of the composite’s Young modulus can be designed, this paper studied the relationship of the composite shaft critical speed with the engineer constant, the thickness of the shaft and the diameter, studied the relationship of the critical buckling strength with the axial Young modulus, circumferential Young modulus and the thickness of the shaft. According to the design needs, designed correlative laminates, preparation of the composite shaft sample and verified the theoretical compute. According to the theoretical compute and the test results, designed and established the composite shaft’s parameters.（4） According to the composite joint’s types and characteristic, the paper chose the bolt joint, designed the parameter of the bolt joint’s screw and the strengthen part. Then chose the material of the flange and designed the dimensions of the flange by compute.（5） Proofreaded the stiffness, the strength and the critical speed of the integral composite transmission shaft with metal flange.（6） Recur to the Ansys finite soft, computed the mechanics and model of the composite, the mechanics of the titanium flanges and the model of the intergal composite transmission shaft with metal flange by Finite Element Analysis.The final testing result shows that: the mechanical performance of the CF composite transmission shaft is better than the traditional metal shaft. The ultimate torsional strength of the CF composite exceeds 300MPa. So the design could achievethe request of the contract easily.