Factor apportioning the 2nd armour bedding

Factor for apportioning the thermal capacitance of the second armour bedding

Symbol
$p_{ab2}$
Formulae
$\frac{1}{2 \ln{\left(\frac{D_{a_{2}}}{D_{2_{2}} - 2 t_{ab_{2}}} \right)}} - \frac{1}{\frac{D_{a_{2}}^{2}}{\left(D_{2_{2}} - 2 t_{ab_{2}}\right)^{2}} - 1}$
Related
$D_{2_{2}}$