  In this short contribution we introduce a new procedure to recover the stress
and strain fields for particle systems by mechanical models. Numerical tests
for simple loading conditions have shown an excellent match between the
estimated values and the reference values. The estimated stress field is also
consistent with the so called Quasicontinuum stress field, which suggests its
potential application for scale bridging techniques. The estimated stress
fields for complicated loading conditions such as defect and indentation are
also demonstrated
