ESDU 85037:2011

ESDU 85037 provides a computer program (ESDUpac A8537) for
estimating the lower natural frequencies of initially unstressed
rectangular sandwich panels. It is presented for convenient use
when the face plates are fibre-reinforced laminates. It applies to
flat, or slightly curved, panels with thin orthotropic face plates
having their principal axes of orthotropy aligned with the sides.
The face plates may be of different materials and thicknesses and
the core is assumed to have zero flexural stiffness.
Simply-supported edges are assumed, but guidance is provided on the
use of effective panel dimensions to allow consideration of other
edge conditions. Predictions of natural frequency are compared with
test results from the literature for panels with fibre-reinforced
face plates and agree to within 10 per cent. Details of input and
output format are provided through a practical worked example.