2. Thickness calculation (Newtonian lubricant) The aim here is to provide formulas for estimating the order of magnitude of lubricant film thickness and describing lubricant film morphology. For this purpose, we adopt the following simplifying assumptions: thermopiezoviscous lubricant, viscosity (Δθ is the temperature increase above a reference temperature θ 0 ) : η=η0 exp(γp−δΔθ)( 1 ) with : ...