Modeling And Simulation Study On The Dry Friction And Wear Properties Of PEEK

Polyether ether ketone materials(PEEK)have excellent self-lubricating,friction resistance,corrosion resistance and low density.As friction materials,polyether ether ketone materials have been widely used in aerospace,automobile industry and biomedical fields,but their friction and wear properties are more complex and greatly affected by friction conditions.at present,there is still a lack of systematic research on PEEK friction and wear properties.Based on the dry friction wear experiment,the influence of friction conditions on the friction and wear properties of PEEK materials is systematically studied and the corresponding wear models are established.The corresponding numerical simulation method of wear finite element method is established by finite element method,and further exploration is made.(1)Based on the dry friction wear experiment,the effect of friction conditions on PEEK friction and wear properties was studied.Based on this,a modified Archard wear model was established.The friction conditions take into account the influence of different PV values(the product of contact stress and relative slip velocity)and temperature.The wear rate,friction coefficient and other friction and wear performance parameters of PEEK materials under dry friction conditions are obtained by the end friction and wear testing machine.The average contact temperature of the friction contact surface of PEEK material was obtained by the method of finite element simulation,and based on the PV value and the average contact value temperature to establish the corresponding wear rate calculation model.Through the study of the wear rate of PEEK materials under different PV value conditions and the wear rate of PEEK materials under different ambient temperature conditions.With the increase of PV value,the wear rate of PEEK materials shows an increasing trend.As the ambient temperature increases,the wear rate of PEEK materials also shows an increasing trend.However,the wear rate of PEEK materials increases significantly less with the PV value than with the temperature.(2)Secondly,the numerical simulation method of friction and wear of PEEK products is developed based on the modified wear rate model and finite element numerical analysis method.By combining with the adaptive mesh subroutine,the node contact pressure,relative slip velocity,temperature parameters are extracted to calculate the wear depth and direction,and the contact surface node position of the wear finite element model is updated based onthis.In the meantime,the simulated friction temperature field is introduced into the wear finite element model,and the complete frame of sequential thermal coupling is completed.Well,it proves the rationality of the wear finite element numerical simulation method.(3)Finally,based on the above work,the validity and rationality of the energy-based PEEK wear model are further studied.Archard wear model is a classical phenomenological model with high correlation of application conditions.The energy-based wear model is based on the principle of energy balance,which can describe the wear process more generally.Based on the energy method wear model,the relationship between specific wear rate and unit distance friction work and the influence of friction conditions are studied by analyzing the experimental data of friction and wear,which can provide guidance for the establishment of PEEK material energy wear model.