粗糙金属表面接触性能研究

The Property Analyses in Sliding Lubricated Rough Contacts

计算粗糙金属表面接触性能时，通常忽略凸体之间的相互影响和应力场、特别是热应力场的影响，这给高副接触性能的计算带来误差。本文在考虑微凸体之间相互影响的基础上，计算了线接触金属摩擦副接触表层中的压力场、温度场及应力场（包括等温应力和热应力场）。结果表明：表面粗糙度对压力分布、温度分布及应力分布均有重要影响；热应力使最大总Ｍｉｓｅｓ应力移向表面，且随βｔ值的增大，总Ｍｉｓｅｓ应力迅速上升。这对研究胶合失效机理和边界膜成膜机理具有重要意义。

During calculating the properties of rough contacts,the effects of aspority in teractions and stress,especially thermal stress on the properties have often been negleeted; This will caues error in calcu-lating the properties of concentrated contalts, In fact,the stress(including isothermal and thermal stresses)of surficial layers has an important effect on the tribological perfoimance of metal surface. On the basis of taking asperity interations into account,this paper has calculated the pressure,surface tempera-ture,isothermal and thermal stress of surficial layers created by rough contacts. The results in indicate that surface roughness has an important influence on the pressure, surface temperature,isothermal and thermal stress fields;pressure,surface temperature and isothermal stress incrase with increasing surface roughness parameter A,but thermal stress decreases with increasing A,thermal stress tends to move the re-gion of maximum total Mises stress towards the surface, and total Mises stress increases rapidly with in-creasing βt.The above mentioned cases play an inportant role in studying scuffing failure and boundary filin formation.