Simulation And Experimental Verification Of Continuous Friction And Wear Of PTFE/Aramid Self-Lubrication Fabric Liner

Self-lubricating spherical plain bearings are widely used in aerospace,railway machinery and other fields because of their compact structure,impact resistance and maintenance free.As a key component of the self-lubricating spherical plain bearing,the performance of the self-lubricating fabric liner plays a decisive role in the service life and reliability of the bearing.It is costly and inefficient to study its performance based on the experimental method,and the simulation can make up for these shortcomings.However,it is difficult to analyze the influence of the dynamic evolution of the contact surface on the wear process based on the macroscopic liner model.Therefore,this paper takes the mesoscopic model of fabric liner as the research object and combines the self-developed topology fusion method to study the continuous friction and wear process of fabric liner.The main contents of this paper are as follows:Based on the half-ring and plane wear experiments of polytetrafluoroethylene(PTFE)/Kevlar self-lubricating fabric liners,the change curve of the wearing depth with the wear time during the wear process was obtained,the change of the wearing depth at different stages and the reasons for the change were analyzed,and the wear mechanism of the liners at different wear stages was expounded.Based on the section geometry of the gasket,the section function of the fiber bundle was obtained,the path curve description equation of the fiber bundle was constructed,the main direction of the material in different parts of the fiber bundle was calculated,and the parametric PTFE/Kevlar fabric gasket voxel model was established,the orthogonal anisotropic wear constitutive of the gasket was derived,and the cross-layer wear simulation of the unit was realized.Periodic boundary conditions were applied to the boundary of Representative Volume Element(RVE),and the residual elastic parameters of the liner at different wear depths under unidirectional stress were calculated.The changing rule of the elastic parameter curve,the causes of the changes and the factors affecting the changes were analyzed,and the influence of the residual parameters on the liner wear was studied.APDL language was used to write the geometric calculation and topology fusion algorithm of unit wear,ABAQUS software was used to establish the analysis model of half-ring and plane wear,and the innovation was proposed to use the voxel model to simulate wear,so as to realize the continuous wear simulation of half-ring and plane under different working conditions.The dynamic evolution mechanism of mechanical and tribological parameters in the wear history of fabric padding was analyzed.By comparing with the wear experiment,the correctness and accuracy of the wear simulation method are verified.