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A method is proposed to identify the mechanical properties of the skin and core
materials of honeycomb sandwich. All the elastic coefficients and loss-factors
that matter in the dynamics of a panel in the thick-plate approximation are
identified. To this end, experimental natural modes (i.e. eigenmodes of the
damped system) are compared to the numerical modes of a large sandwich panel
(lx,y/h ≃ 80). The chosen generic model for
the visco-elastic behaviour of the materials is E (1 +
jη). The numerical modes are computed by means of a
Rayleigh-Ritz procedure and their dampings are predicted according to the
visco-elastic model. The frequencies and dampings of the natural modes of the
panel are estimated experimentally by means of a high-resolution modal analysis
technique. An optimisation procedure yields the desired coefficients. A
sensitivity analysis assess the reliability of the method
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