Optimization of FDM process parameters for chopped carbon fiber reinforced polyether ether ketone under vacuum
In-orbit 3D printing is a new type of space manufacturing technology under extreme space environmental condi-tions and has a very broad application prospect.In the vacuum environment of space,the heat dissipation mode of the material is mainly radiative heat dissipation,and the high-temperature melt extruded from the print head experiences different thermal history during the cooling process compared with the ground printing,which ultimately affects the mechanical properties of the printed part.Therefore,the thermal analysis model of chopped carbon fiber reinforced polyether ether ketone(PEEK)composites in the molding module under vacuum environment was established by the finite element analysis method.The heat conduction law of chopped carbon fiber reinforced PEEK melting forming under vacuum environment was investigated by analyzing the temperature field of the composite in the flow channel of the molding module.Combined with the results of simulation analysis,the orthogonal test method was used to carry out the experimental design of the optimization for the 3D printing process parameters of chopped carbon fiber reinforced PEEK with fused deposition modeling,and the range analysis and single factor test analysis were carried out,and the optimal process strategy was established to ensure the excellent mechanical properties of the specimen printed under vacuum environment.The finite element analysis results show that the melting process of the composite in the molding module is not signifi-cantly affected by the heating block temperature in the range of 380-410℃,and the higher the wire feed speed,the less sufficient the melting process of the composite.The wire feed speed of the chopped carbon fiber reinforced PEEK composite should be kept no more than 8 mm/s.The experimental results show that for the tensile strength,the optimal combination of process parameters are heating block temperature of 390℃,scanning spacing of 0.6 mm,layer thickness of 0.2 mm,and printing speed of 20 mm/s.For the tensile modulus,the optimal combination of process parameters are heating block temperature of 410℃,scanning spacing of 0.6 mm,layer thickness of 0.2 mm,printing speed of 30 mm/s.
space manufacturingin-orbit 3D printingfused deposition modelingcompositeprocess parametersmechanical property
万方数据
维普
