Cableizer ®

Moment of inertia (bending) armour

Symbol
$J_{ar}$
Unit
mm$^4$
Formulas
$n_{ar} \frac{\pi {t_{ar}}^4}{64}+\frac{\pi {t_{ar}}^2}{4} \frac{n_{ar} {D_{ar}}^4}{4}$round wires
$\frac{n_{ar}}{2} \left(\frac{t_{ar} {w_{ar}}^3}{12}+\frac{w_{ar} {t_{ar}}^3}{12}\right)+\frac{n_{ar}}{2} t_{ar} w_{ar} {D_{ar}}^2$flat wires
Related
$D_{ar}$
Diameter over armour [mm]
$n_{ar}$
Number of wires armour
$\pi$
Archimedes' constant $\pi$
$t_{ar}$
Thickness armour [mm]
$w_{ar}$
Width armour [mm]
Used in
$J_{tot}$
Moment of inertia (bending) cable [mm$^4$]
$JE_c$
Flexural stiffness cable [kN.mm$^2$]