Computational Mechanics '95 (Eds. S.N.Atluri et al.), pp. 2358-2363, 1995


NUMERICAL AND EXPERIMENTAL INVESTIGATIONS
OF FAILURE IN INTEGRALLY STIFFENED,
LAYERED COMPOSITE PANESL

I.C. Skrna-Jakl¹, F.G. Rammerstorfer¹ and E.K. Tschegg²

¹Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria
²Institute of Applied and Technincal Physics,
TU Wien, Vienna, Austria


Abstract - Stiffened composite structures have become an important structural application of composite materials, and they are progressively introduced especially into primary aerospace structures. Therefore, the design of stiffened structures using composite materials requires an accurate analysis of the mechanical behavior of the components. Global effects (e.g. large deformations, stability behavior) as well as local effects (e.g. regions of pronounced interlaminar stresses, free edge effects) must be analyzed in order to prove that the design can carry the specified loads without failure.
The present study aims at pointing out failure prone regions in integrally stiffened composite structures by investigating their mechanical behavior numerically as well as experimentally. Special attention is given to the determination of interlaminar stresses, free edge effects and the failure behavior in skin-stringer transitions. In addition, the influence of the fiber orientation angle in the off-axis plies on the above mentioned effects is analyzed.


(hjb,960628)