Steel Glass Radius of curvature Young modulus Poisson's ratio 12.7 mm 206 GPa 0.3 ∞ 81 GPa 0.209 Sapphire ∞ 405 GPa 0.25 3. Results and Discussion A series of EHL contacts with parameters listed in Table 3 were numerically simulated. A convergence better than 10−4 was required. The ...