Pressure and film-thickness profiles along the symmetry plane y ¼ 0 are shown in Fig. 11. To illustrate the finite deformation effects, results of two simplified models are included in Fig. 11 in addition to the results obtained using the present fully nonlinear model (denoted by solid lines). The first simplified model accounts for finite deformations and the related material and geometrical nonlinearities, however, the friction stresses acting on the ball are neglected (the corresponding results are denoted by dashed lines). In the second simplified model, a geometrically linear theory is adopted so that deformations of the ball are governed by small- strain linear elasticity and configuration changes are neglected. Friction stresses are also neglected, and this model (denoted by dash-dotted lines) is thus equivalent to the classical EHL theory.