In this paper we consider the inverse
problem of determining, within an elastic isotropic thick plate
modelled by the Reissner-Mindlin theory, the possible presence of
an inclusion made of a different elastic material. Under some a
priori assumptions on the inclusion, we deduce constructive upper
and lower estimates of the area of the inclusion in terms of a
scalar quantity related to the work developed in deforming the
plate by applying simultaneously a couple field and a transverse
force field at the boundary of the plate. The approach allows to
consider plates with boundary of Lipschitz class.
