Tribological Properties And Numerical Simulation Of Polymer Matrix Composites

Nowadays,the rapidly developing manufacturing industry has increasingly higher requirements on the properties of composites.Polymer matrix composites are gradually replacing metal materials to become the most promising composites due to their light weight,high performance and good workability.In order to improve the tribological properties of polymer matrix composites and save experimental costs,this paper carried out basic researches on filler modification,wear resistance enhancement and finite element simulation.Two kinds of polyvinylidene fluoride?PVDF?and one kind of epoxy resin?EP?based anti-friction and wear-resisting composites were prepared.The related mechanism was also investigated by means of FT-IR,DSC,XRD,TG and SEM.Moreover,ANSYS finite element?FE?analysis software was used to establish a novel two-dimensional model.The experimental results are predicted by analyzing the thermal-stress coupling field inside the composites,revealing the wear reduction mechanism of the sample during the friction process.The main contents of the paper are summarized as follows.?1?This experiment taked PVDF as the matrix and diatomite?DE?purified by sulfuric acid?SA?as the reinforcing material.By means of chemical modification and vacuum impregnation,lubricating oil containing modified nano-CeO₂ with different morphology was injected into the DE.Tribological properties and shore hardness of nano-CeO₂/oily DE/PVDF composites were investigated by using the friction and wear testing machine and shore hardness tester,and the modification and related mechanism were explored by using FT-IR,DSC,TG,XRD,SEM and other characterization methods.The experimental results showed that the oil-absorbing capacity of DE was improved after the modification of SA,and the modified rodlike nano-CeO₂ had a great influence on the tribological properties of PVDF composites,while the modified spherical nano-CeO₂ had a great influence on the crystallinity and shore hardness of the composites.?2?In this experiment,microcapsule?MC?/PVDF and MC/carbon fiber?CF?/PVDF composites were prepared with PVDF as the matrix,polysulfone MC and CF as the reinforcing materials,by means of molding sintering and melting blending,and different effects of MC and CF on PVDF materials were explored.At the same time,the internal microstructure of the composites was understood by means of TG and SEM,on which the corresponding two-dimensional model was established for the first time.With the help of ANSYS FE analysis software,the mechanism of wear and abrasion reduction in the experiment and the synergistic effect between the two reinforcing materials were explored,which provided certain enlightenment for similar tribology experiment systems containing MC and CF in the future.?3?Urea-formaldehyde resin microcapsule?UFMC?with different particle sizes were mixed with tetraethylenepentamine curing agent and E51 epoxy resin?EP?,and then cured them at room temperature to obtain UFMC/EP composites with different particles,investigating the effects of UFMC with different particle sizes on the tribological properties of EP composites under different conditions.Meanwhile,the effects of UFMC with different particle sizes on the thermal-stress distribution in the matrix were investigated by numerical simulation.Both experiment and simulation results show that in the case of constant load,the friction coefficient,wear rate and contact temperature increase with the increase of sliding speed.In addition,the UFMC with smaller particle size greatly improved the tribological properties of the composites,while the UFMC with larger particle size had a greater impact on the simulation results.