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Cross-sectional area of armour

Symbol
$A_{ar}$
Unit
mm$^2$
Formulae
$n_{ar} \left(\frac{t_{ar}}{2}\right)^2 \pi$round wires
$n_{ar} t_{ar} w_{ar}$flat wires
$\left(\left(\frac{d_{ar}+t_{ar}}{2}\right)^2-\left(\frac{d_{ar}-t_{ar}}{2}\right)^2\right) \pi$TECK, steel tapes
Related
$a_{type}$
Construction of armour
$d_{ar}$
Mean diameter of armour [mm]
$n_{ar}$
Number of wires of armour
$\pi$
Archimedes' constant $\pi$
$t_{ar}$
Thickness of armour [mm]
$w_{ar}$
Width of armour [mm]
Used in
$\delta_{ar}$
Equivalent thickness of armour [mm]
$F_{ppc}$
Permissible pull force [N]
$\lambda_2$
Loss factor of armour
$m_{ar}$
Mass of armour [kg/m]
$Q_{ar}$
Thermal capacitance of armour [J/(m.K)]
$R_{ar}$
Electrical resistance of armour [$\Omega$/m]
$\rho_{ar}$
Specific electrical resistivity of armour material [$\Omega$.m]