Equivalent radius of the backfill area.

Symbol
$r_{\mathrm{b}}$
Unit
mm
Formulae
$e^{\frac{b_{\mathrm{x}}}{2 b_{\mathrm{y}}} \left(- \frac{b_{\mathrm{x}}}{b_{\mathrm{y}}} + \frac{4}{\pi}\right) \ln{\left (1 + \frac{b_{\mathrm{y}}^{2}}{b_{\mathrm{x}}^{2}} \right )} + \ln{\left (\frac{b_{\mathrm{x}}}{2} \right )}}$
Related
$b_{\mathrm{x}}$
$b_{\mathrm{y}}$
Used in
$G_{\mathrm{b}}$