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$\mathrm{mm}$
$P$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$\mathrm{MPa}$