Preparation And Mechanical And Magnetic Heating Properties Of Polyether Ether Ketone Based Composites

Polyetheretherketone(PEEK)matrix composite material has excellent comprehensive performance and has great application in aerospace,automobile and medical etc.At present,the forming method of the basic elements of large truss structures in orbit is single and affected by the on-orbit environment.In addition,the preparation efficiency of basic rod elements is low,the performance is poor,and the energy consumption is large.Therefore,it is necessary to design and develop new composite materials with adaptability to the on-orbit environment.In consequence,the purpose of this paper is to explore a new type of magnetic permeability laminated composite plate with good adaptability to the on-orbit environment,and use COMSOL to screen and analyze the reinforced phase.Taking PEEK matrix composite material as the research object,the process optimization of metal mesh reinforced polyether ether ketone composite material(Wire/PEEK,W/PEEK)under hot pressing mode was discussed.The molding performance and mechanical properties of molded composite sheet were studied in depth.Besides,in order to explore the application of induction heating of composite materials under the special environment in orbit,the characteristics of induction heating rate and distribution were analyzed through the combination of finite element simulation and process experiment,so as to verify the practicability of composite materials in orbit environment.Firstly,through screening the reinforced phase and reinforced form with induction heating ability,COMSOL advanced analysis was used to compare the induction heating ability of carbon fiber,metal mesh and iron nickel metal skeleton,and through experimental verification,the following results were obtained: The metal mesh was used as the reinforced phase to obtain the excellent induction heating ability of W/PEEK composite.The heating efficiency of W/PEEK composite is 12 ℃/s,10 times and 30 times of that of carbon fiber and Fe-Ni alloy porous skeleton,respectively.Secondly,the bending properties of W/PEEK were investigated under different preparation parameters,and the relevant properties of composite materials were obtained by three-point bending experiments.According to the results,the best bending properties were obtained under the experimental conditions of 330 ℃,0.98 KN and 7min,with the bending modulus and bending strength of 23.50 GPa and 294.62 MPa,respectively.In addition,the tensile properties of W/PEEK composites prepared under different technological parameters were tested and analyzed.The results showed that the optimum tensile properties were obtained at 330 ℃,0.98 KN and 7 min.The tensile strength and tensile modulus of the composites were 110.69 MPa and 21.66 GPa,respectively.At the same time,the constitutive equation fitting was carried out in the wide temperature range from low temperature to high temperature,and the temperature correlation interpolation function was established to predict the mechanical properties of the composite materials in different temperature ranges.In addition,a multi-field coupling finite element model of electric-magnetic-thermal was established to clarify the central temperature field of the composite sheet,analyze the heating efficiency,temperature extremum and temperature distribution uniformity,etc.,and illustrate the variation rule of W/PEEK induction heating process.Entropy theory was used to evaluate the uniformity of the temperature field of the composite sheet,so as to realize the quantitative analysis of uniformity.It provides the necessary theoretical basis for the secondary forming of composites by induction heating in orbit.