A 2-COMPONENT MIXED FRICTION MODEL FOR A LUBRICATED LINE CONTACT

A two-component two-dimensional friction model for a lubricated line c ontact, operating in boundary and mixed lubrication regimes, is develo ped. The friction is explicitly decomposed into the solid and the flui d shear components. The solid component is due to the asperity interac tions and the fluid shear arises from the lubricant present at the int erface. The friction model includes the sliding velocity, the instanta neous separation of the sliding bodies, normal to the sliding directio n, the normal load and fluid properties. The model is based on unstead y friction experiments carried our under constant normal loads and tim e-varying sliding velocities. The model is applied to quasi-steady sli ding, unsteady continuous and intermittent sliding, including sticking and momentary reversals of motion. In each case it becomes possible t o track the instantaneous fluid shear and solid friction components.