Numerical Simulation And Experiment Of Friction And Wear Of Self-Lubricating Liner Of Fiber Fabric

The fiber fabric self-lubricating gasket carries the force of the inner and outer rings of the bearing and provides the effect of lubrication and friction reduction,which is the core factor affecting the tribological performance of self-lubricating plain bearings.The test is the main means to study the friction and wear of the fiber fabric self-lubricating gasket,but the experimental research consumes manpower and material resources,and is limited by the test materials,test equipment and other practical conditions,so the test research has some limitations.Numerical simulation has become one of the effective supplementary means of experimental research.The combination of numerical simulation and test is helpful to comprehensively analyze the tribological properties of fiber fabric self-lubricating gasket and provide a theoretical basis for clarifying the failure mechanism of fiber fabric selflubricating gasket.It is of great significance to improve the performance of self-lubricating plain bearings and the research and development of precision self-lubricating plain bearings.In this paper,a practical three-dimensional model of yarn fibrotic fabric self-lubricating gasket is applied,and numerical simulation analysis is carried out on the basis of this model to investigate the tribological properties of fiber fabric self-lubricating gasket at different wear stages.Based on the control of textile structure parameters based on parametric modeling,the effect of textile structure parameters on the tribological properties of fiber fabric self-lubricating gaskets is studied.The tribological test and wear surface morphology analysis of fiber fabric self-lubricating gasket were carried out,and the wear mechanism was studied by comparing the numerical simulation and test results.Research shows that:(1)During the wear process,the stress value of Kevlar fiber is the largest,followed by PTFE fiber,the stress value of resin matrix is the smallest,and the stress value of Kevlar fiber near the interweaving point is larger.Combined with contact analysis to calculate the friction coefficient of the heterogeneous wear surface of the self-lubricating liner of the fiber fabric,the results show that the coefficient of friction decreases in the initial stage,then rises slightly,and as the wear progresses,it decreases again and then rises.The wear curve shows that the wear of the self-lubricating liner of the fiber fabric changes from the initial stage to a gentle one.(2)The change of textile structure parameters affected the proportion of antifriction material PTFE fiber and wear-resistant material Kevlar fiber in the self-lubricating gasket of fiber fabric,which in turn affected the tribological properties of the self-lubricating liner of fiber fabric.The proportion of PTFE(Kevlar)fiber increases with the increase of weft(warp)yarn diameter and weft(warp)density,and the stress change,friction coefficient and wear performance of fiber fabric self-lubricating liner during wear also change.(3)The phased tribological test of self-lubricating liner of fiber fabric was carried out,and the wear mechanism of self-lubricating liner of fiber fabric was studied by combining the wear surface morphology and friction wear performance.Comparing and analyzing the test results with the numerical simulation results,the two are more consistent,and it can be seen that the self-lubricating liner model of fibrous fabric is suitable for numerical simulation in the field of tribology and has good consistency with the actual situation.