Transient EHL solutions with interfacial slip

Simulations are carried out of an experimental procedure in which a ball im pacts a thin layer of lubricant on a disk to form a dimple of entrapped lub ricant. Thereafter pure sliding conditions are imposed to release the entra pped lubricant from the contact. Conditions of slip between the core of the lubricant and the wall are investigated to explain the slower release of t he lubricant observed in pure sliding conditions when the ball alone is in motion. A slip value up to 63 per-cent at 1 GPa enables numerical simulatio ns to match the time of release of the entrapped lubricant measured experim entally.