| Carbon fiber reinforced polymeric composites(CFRP)has light weight,high strength,resistance to friction and a series of advantages,structure materials in the field of automotive and aerospace lightweight applications has immeasurable value,However,there are still some problems,such as high cost,poor interface performance,brittle fracture easily,and difficult to recover,which limit the application of CFRP.How to reduce the cost of CFRP,optimize the interface performance,improve the fracture toughness,and achieve recovery and reuse has always been the key issues to be solved in this field.self-reinforced composites(or all-polymer composites,or SRC)was widely used in the field of protective equipment,sports equipment,luggage and other everyday goods due to its low cost,excellent interface performance,good impact resistance,easy recovery and other excellent characteristics.However,the low strength and modulus severely limit the application of SRC.Therefore,this paper used continuous carbon fiber(CF),polyamide fiber(PF)and polyamide copolymer(coPA)to prepare the Synergistic reinforcement system of carbon fiber and polyamide self-reinforcing composites(CF-PF/coPA)by using laminated hot-pressing technology.In other words,on the basis of carbon fiber reinforced polyamide composites(CF/coPA),polyamide self-reinforced composites(PF/coPA)with excellent interfacial properties and good toughness were introduced to obtain this kind of hybrid composite synergistic strengthening system which can provide high strength,high modulus and high fracture toughness at the same time.This paper mainly focuses on the preparation process parameters of the collaborative enhancement system and the technical problems of simulation application on the unmanned aerial vehicle(UAV)propeller.The following studies are carried out:(1)Study on surface treatment methods of carbon fiber and processing parametersScanning electron microscopy(SEM),infrared spectroscopy(FTIR)and single fiber tensile test were used to characterize the carbon fibers with different surface treatments.It was found that the number of polar functional groups and the surface roughness of carbon fiber were significantly increased after different surface treatment processes,which greatly increased the surface area of carbon fiber.Through the longitudinal tensile test,the experimental parameters of the preparation of polyamide self-reinforced composites were explored,and the optimal hot pressing temperature and pressure for the preparation of polyamide self-reinforced composites were obtained.(2)Structural design optimizationThe longitudinal/transverse tensile mechanical properties,bending properties and thermomechanical properties of CF-PF/coPA composites with different fiber volume fraction were studied by 0~o/90~otensile test,scanning electron microscopy,three-point bending test and dynamic mechanical and mechanical properties test.Finally,the comparison shows that the CF-PF(10:10)/coPA composite has the best comprehensive performance.The mechanical properties of CF-PF(10:10)/coPA composites were studied by longitudinal tensile test,three-point bending test and dynamic thermo-mechanical test.The optimal laying mode was PF/CF/CF/PF,and the optimal laying Angle should be selected according to different practical application requirements.The tensile and bending properties of CF20/coPA,CF-PF(10:10)/coPA and CF-NPF(10:10)/coPA composites were compared by longitudinal tensile test and three-point bending test.The results show that PF with smaller diameter is more beneficial to improve the tensile properties and bending properties of hybrid composites,and improve the fiber reinforcement efficiency.(3)Application verification of UAV propeller simulationThe UAV propeller is modeled by Solid Works 2016,and the simulation research is carried out by Fluent.The results show that the hybrid composite meets the standard of UAV propeller preparation when the propeller speed is 3000 RPM at standard atmospheric pressure. |
PDF Full Text Request