SAMPE'95: Proc.Int.SAMPE Conference, 1995


COMPUTATIONAL DESIGN OF INTEGRAL STIFFENING
IN COMPOSITE SHELLS WITH RESPECT TO DIFFERENT
FAILURE MECHANISMS

I.C. Skrna-Jakl and F.G. Rammerstorfer

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


Abstract - Stiffened composite structures have become an important structural application of composite materials and they are progressively introduced into primary aero-space structures. The present study aims at pointing out failure prone regions in integrally stiffened composite structures by numerically investigating their mechanical behavior. Special attention is given to the determination of interlaminar stresses, free edge effects and the failure behavior in the skin-stringer transition.
In order to obtain a detailed insight into the mechanical behavior in the skin-stringer transition a 3D-solid/shell finite element approach is used. Special emphasis is focused on discussing the influence of selected design parameters on the triaxial state of stress and the onset of failure of stiffened composite structures. The following design parameters are investigated: the fiber orientation angle in the off-axis plies, the transition radius/layer thickness ratio, different unidirectional layer materials as well as different core materials.


(hjb,960715)