Acta Mech. 141, 1-10, 2000

THE EFFECTS OF IN-PLANE STIFFNESS ON THE WRINKLING BEHAVIOR OF THICK SANDWICHES

W.K. Vonach, F.G. Rammerstorfer

Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria


Abstract - 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.
(hjb,000502)