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W.K. Vonach, F. G. Rammerstorfer:
"The Effects of In-Plane Core Stiffness on the Wrinkling Behavior of Thick Sandwiches";
Acta Mechanica, 141 (2000), 1-2; S. 1 - 10.

Summary This contribution presents a refined analytical solution for the wrinkling of sandwich plates with isotropic face layers and thick orthotropic cores, taking into accountin-plane deformations of the core. A single explicit equation for the critical wrinkling load in an asymptotic sense in derived. The results have been verified extensively by a numerical model [1] 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 this paper. Classical wrinkling formulae [2], [3], [4] can lead to significant errors when used in connection with highly orthotropic cores.

http://dx.doi.org/10.1007/BF01176803