Filament bending modulus
= Filament bending modulus
{title2=$B$}
The filament bending modulus multiplies squared <curvature of a space curve> in the bending energy, $E_b=(B/2)\int\kappa^2\,ds$. It has dimensions force times length squared. In the small-slope <Monge representation>, the leading elastic force per unit length is $-By_{xxxx}$.