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From:
H. Abramovich (1), C. Bisagni (2), and P. Cordisco (2),
(1) Technion, Faculty of Aerospace Engineering
Haifa, Israel
(2) Politecnico di Milano,Dipartimento di Ingegneria Aerospaziale Milan, Italy
“Effect of cyclic post-buckling loads on CFRP panels,” 2008 (publisher not given in the “pdf” file)
ABSTRACT: Experimental results obtained on four carbon fiber composite stiffened curved panels subjected to static and cyclic compression and shear loadings are discussed. Two of the four panels presented an initial delamination obtained with Teflon inserts between stringers and skin. Panels were assembled in two closed boxes using flat aluminum plates. This solution allows the application of shear on each panel by applying torque on the box. The first box was obtained using undamaged panels, while the second one assembling damaged panels. Results are described in terms of axial load vs. shortening curve, torque vs. rotation curve, deformed shape and strain measurements. Boxes were subjected to a cyclic post-buckling torque, allowing the investigation of the effect of cyclic buckling in terms of global and local behavior. The obtained results show that this kind of structures can well work in the post-buckling field even if during their operative life the buckling load is reached thousands of times.
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