List of symbols
| Symbol | Name of the symbol | Unit |
|---|---|---|
| $C_E$ | material coefficient | $\mathrm{\cfrac{1}{MPa}}$ |
| $D_1$ | sphere diameter $ D_1 $ | $\mathrm{mm}$ |
| $D_1$ | diameter of spherical socket | $\mathrm{mm}$ |
| $D_1$ | cylinder diameter $ D_1 $ | $\mathrm{mm}$ |
| $D_1$ | diameter of cylindrical socket | $\mathrm{mm}$ |
| $D_2$ | sphere diameter $ D_2 $ | $\mathrm{mm}$ |
| $D_2$ | cylinder diameter $ D_2 $ | $\mathrm{mm}$ |
| $E_1$ | modulus of elasticity to bodie 1 | $\mathrm{MPa}$ |
| $E_2$ | modulus of elasticity to bodie 2 | $\mathrm{MPa}$ |
| $K_D$ | dimensional coefficient | $\mathrm{mm}$ |
| $L$ | length | $\mathrm{mm}$ |
| $P$ | total load | $\mathrm{N}$ |
| $a$ | radius of circular contact area | $\mathrm{mm}$ |
| $b$ | width of rectangular contact area | $\mathrm{mm}$ |
| $c$ | major semiaxis | $\mathrm{mm}$ |
| $d$ | minor semiaxis of elliptical contact area | $\mathrm{mm}$ |
| $p$ | load per unit length | $\mathrm{N/mm}$ |
| $y$ | relative motion of approach along the axis of loading of two points, one in each of the two contact bodies, remote from the contact zone | $\mathrm{mm}$ |
| $α$ | coefficient $ α $ | $\mathrm{ }$ |
| $β$ | coefficient $ β $ | $\mathrm{ }$ |
| $γ$ | coefficient $ γ $ | $\mathrm{ }$ |
| $ν_1$ | Poisson's ratio to bodie 1 | $\mathrm{ }$ |
| $ν_2$ | Poisson's ratio to bodie 2 | $\mathrm{ }$ |
| $σ_c$ | contact stress | $\mathrm{MPa}$ |