Acta Mech. 141, 1-10, 2000
W.K. Vonach, F.G. Rammerstorfer
Institute of Lightweight Structures and Aerospace
TU Wien, Vienna, Austria
This contribution presents a refined analytical solution for the wrinkling of
sandwich plates with isotropic face layers and thick orthotropic cores, taking
into account in-plane deformations of the core.
A single explicit equation for the critical wrinkling load in an asymptotic
sense is derived.
The results have been verified extensively by a numerical model and show that,
when dealing with highly orthotropic cores (e.g. honeycombs), the wrinkling
loads and deformation patterns can strongly depend on the in-plane stiffness
of the core.
This new theoretical finding which is of considerable practical importance is
the main motivation for the main motivation for this paper.
Classical wrinkling formulae can lead to significant errors when used in
connection with highly orthotropic cores.