(a) Estimate the strain energy of an edge dislocation where r = 10 mm, r0 = 1 nm, G =
50 GPa,
b = 0.25 nm, and
u = 1/3. Express the result in electron volts per atomic plane. How
much energy
(electron volts) is required to produce 1 cm of dislocation line?
(b) Show that more than one-half the strain energy resides outside the core of the
dislocation in
the region r = 10-4
to r = 1 cm.