Struct.Engng.Mech. 12, 363-376, 2001
W.K. Vonach, F.G. Rammerstorfer
Institute of Lightweight Structures and Aerospace
TU Wien, Vienna, Austria
Sandwich plates are widely used in lightweight design due to their high
strength and stiffness to weight ratio.
Due to the heterogeneous structure of sandwich plates, they can exhibit local
instabilities (wrinkling), which lead to a sudden loss of stiffness in the
This paper presents a Rayleigh-Ritz method, by assuming an appropriate
In contrast to the other approaches up to now, this model takes arbitrary and
different orthotropic face layers, finite core thickness and orthotropic
core material into account.
This approach is the first to cover the wrinkling of unsymmetric sandwiches and
sandwiches composed of orthotropic FRP face layers, which are most common in
advanced lightweight design.
Despite the generality of the solution, the computational effort is kept
The results have been verified using other analytical solutions and unit cell
3D FE calculations.