Equivalent radius of backfill

Equivalent radius of the backfill area.

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