A thermoelastic asperity contact model considering steady-state heat transfer

摘要

One of the important issues in mixed lubrication is the contact problem involving frictional heating in the interface 0/contacting bodies. Due to contact and rubbing, temperature in die solid media varies, causing the contact conditions to changeas a con sequence of thermal distortion. A thermoelastic model for rough surfaces is developed for asperity contact subject to steady-state heat transfer. In this model, asperity distortion due to thermal and elastic-plastic deformations is considered.The thermal deformation Is related to the contact pressure through a thermal influence function. Matrices for thermal and elastic influence functions are solved with the finite element method and the contact problem is computed with a mathematicalprogramming method. Numerical analyses on the thermoelastic contact involving a rough surface reveal that asperity thermal distortion affects the contact pressure and surface separation at high frictional heat and deep asperity penetration.