Nonlocal continuum mechanics allows one to account for the small length scale effect
that becomes significant when dealing with micro- or nano-structures. This paper deals
with the lateral-torsional buckling of elastic nonlocal small-scale beams. Eringen's
model is chosen for the nonlocal constitutive bending-curvature relationship. The effect
of prebuckling deformation is taken into consideration on the basis of the Kirchhoff-Clebsch
theory. It is shown that the application of Eringen's model produces small-length scale terms
in the nonlocal elastic lateral-torsional buckling moment of a hinged-hinged strip beam.
Clearly, the non-local parameter has the effect of reducing the critical lateral-torsional
buckling moment. This tendency is consistent with the one observed for the in-plane stability
analysis, for the lateral buckling of a hinged-hinged axially loaded column. The lateral
buckling solution can be derived from a physically motivated variational principle.