Dislocation line-tension estimate
= Dislocation line-tension estimate
{title2=$T_\ell\sim Gb^2$}
A curved <dislocation> can be approximated as a line with tension $T_\ell$ of order $Gb^2$. The coefficient depends on elastic constants, character and logarithmic length scales. The simple estimate $T_\ell\simeq Gb^2/2$ gives a pinning bypass <stress> $Gb/\ell$ for a semicircular segment of free span $\ell$.