Proc. AECM-5, 1995


ACOUSTIC EMISSION MEASUREMENTS FOR VERIFICATION
OF FAILURE COMPUTATIONS
IN STIFFENED COMPOSITE PANELS

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 - 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 the skin--stringer transition by using the finite element method. In order to verify the numerical results, experimental investigations are performed employing acoustic emission monitoring. Tensile tests of single blade stiffened specimens are used and the location as well as the energy content of the acoustic emission events are measured. The results show a good agreement between the numerically and experimentally predicted failure modes, failure loads and failure prone regions.


(hjb,960715)