Wear Analysis And Numerical Simulation Of High Density Polyethylene Composite Self-lubricating Bearingss

Polymer self-lubricating bearings have a series of advantages such as light weight,low cost,corrosion resistance,good self-lubricating performance and low noise.They have been widely used in various mechanical equipment.In recent years,scholars at home and abroad have conducted a lot of research on the materials and tribological properties of self-lubricating bearings.Considering the economy,good wear resistance,self-lubrication and chemical stability of HDPE,our research group studied the filling modification of HDPE,and prepared a self-lubricating composite wear-resistant material with excellent performance.In this paper,the tribological properties of HDPE/PTW/PTFE/TP composite self-lubricating bearings were studied by means of experiment and numerical simulation.The following aspects were mainly carried out:In this paper,the friction and wear laws of HDPE composites under different loads and rotating speeds were studied by friction and wear experiments.The results show that the load has a significant effect on the friction coefficient and wear rate of the composites.When the load increases,the friction coefficient of HDPE composites decreases,and the wear rate increases.The friction coefficient and wear rate of the material increase first and then decrease with the increase of the speed at high load.At low speed or light load,the wear mechanism of the material is furrow wear and fatigue wear.When the load or rotational speed increases,adhesion wear begins to occur,and further increase will produce plastic flow.The plastic flow caused by high temperature fills in the micro cracks on the friction surface,prevents the expansion of fatigue cracks and plays the role of lubrication,and reduces the friction coefficient.The wear rate decreases at high speed and low load,while increases at high load and low speed.Then the wear coefficient was determined by the experimental results and the Archard wear model was established.ABAQUS and the UMESHMotion subroutine were used to simulate the pin-disk wear experiment,and the contact stress and wear depth obtained from the simulation were analyzed.The average error between the experimental wear depth and the simulated wear depth is 4.57%,and the maximum error is 13.72%.The simulation results are in good agreement with the experimental results,indicating that the finite element wear simulation method and the established wear model have certain validity.Finally,the contact stress and wear depth of the self-lubricating bearing were analyzed by bench test and finite element simulation,and the service life of the bearing was simply estimated.The relative error is 17.42%by comparing the wear volume simulated by the finite element method with the experimental wear volume,which indicates that the finite element simulation method and the wear model obtained by the experiment are effective to a certain extent.Finally,the causes of the error are described.