Study Of Mechanical Properties And Simulation Of Polyphenylene Sulfide For Fused Deposition Modeling In 3D Printing

In recent years,with the continuous development of Three-dimensional(3D)printing technology,3D printers with different molding principles and functions have been used,and the types of printing materials used are relatively wide.The development of 3D printing technology based on the principle of fused deposition modeling is relatively mature.Currently,commonly used materials include polylactic acid(PLA),acrylonitrile butadiene styrene(ABS)and nylon.However,there are still some problems in the printing of special engineering plastics such as polyetheretherketone(PEEK),polyphenylene sulfide(PPS),and polyimide(PI),which are mainly caused by the properties of the material itself,such as PEEK high viscosity,PPS brittleness and other characteristics.To this end,this paper builds a 3D printing experimental platform suitable for a variety of plastics printing by studying the common printer forms and features on the market.PPS materials have excellent properties such as high temperature resistance,corrosion resistance and flame retardancy,which make them widely used in aerospace,mechanical and electrical fields.In this paper,micro-double-screw extruder has been used to successfully prepare PPS materials suitable for 3D printing,which provides good conditions for subsequent printing and experimental testing of samples.According to the molding process of samples,the impacts of different stages were analyzed.The influence of wire feeding speed,printing temperature and layer thickness on the mechanical properties of samples was studied by single factor experiment.Through the experimental results,the orthogonal test was designed to further study the influence degree of samples on the performance of samples and obtain an optimized combination.On the premise of the experiment,the following conclusions can be drawn: for the tensile properties of samples,the maximum tensile strength value can be obtained when the wire feeding speed is 20 mm/s,the printing temperature is 300 ℃,and the layer thickness is 0.2 mm.For the bending performance of the test piece,the maximum bending strength value can be obtained when the wire feeding speed is 25 mm/s,the printing temperature is 290 ℃,and the layer thickness is 0.1 mm.At the same time,when printed samples of PPS material,the printing temperature of about 270 ℃~ 300 ℃ is selected and has no significant effect on the performance of samples.A common defect of printed samples based on the principle of fused deposition modeling is that the edge portion is warped and the interlayer bonding effect is poor.In response to the above problems,printing parameters and heat-treated printed samples are usually adjusted to improve the sample defects.However,there is no theoretical basis for the selection of temperature and holding time during heat treatment.In order to investigate the influence of ambient temperature on the printed samples under different time conditions,the surface temperature and transverse section temperature of the tensile and bending models at different temperatures were simulated and analyzed by finite element method.The temperature of models at different temperatures were studied which the time it takes to rise to the set values.The results show that the model of PPS material is uniformly heated at different temperatures,and the temperature gradient of the transverse section is small,and the temperature differences for different time are within 2℃.By visualizing the time required for different temperature rise conditions,the printed samples can be set to the same time to determine the optimum temperature range during the post-treatment process using the heat treatment method.