O.
J. B. Almeida Pereira and J. P. Moitinho de Almeida
This paper presents the basis of an adaptive mesh refinement technique
aimed at reducing a local error, i.e. the error
in a local quantity, which is defined as the integral of a stress or
a displacement in a given subregion.
Two pairs of dual solutions, one corresponding to the applied load
and the other to the virtual action, dual of the
local quantity, are used to bound the local error and to provide the
element error indicators for the adaptive process.
A test case is used to exemplify the behaviour of the technique.