Sandwich Constructions 2 (Eds. D.Weissman-Berman, K.A.Olsson),
pp. 161-185, 1992


FINITE ELEMENT FORMULATION FOR SANDWICH SHELLS
ACCOUNTING FOR LOCAL FAILURE PHENOMENA

A. Starlinger and F.G.Rammerstorfer

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


Abstract - Based on a sandwich sell theory assuming an antiplane core, finite element algorithms are derived by applying the 3D-degeneration technique. Buckling of the face layers (i.e. wrinkling) and intracell buckling are taken into account in the analysis of local instability phenomena in sandwich sehlls. For core materials that are orthotropic, the ciritical load inducing local buckling of the face layers is determined. In the case of local failure, the stiffness matrices of the shell element are updated. Changes in the core thickness induced by the curvature in case of loading (similar to the Brazier effect) are also calculated, and result in a further modification of the stiffness terms. Some typical examples and experimental verifications show the applicability of the finite element formulation presented here.


(hjb,960710)