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Shock and Vibration
Volume 18, Issue 6, Pages 789-805

Evaluation of the Impact Resistance of Various Composite Sandwich Beams by Vibration Tests

Amir Shahdin,1 Joseph Morlier,1 Laurent Mezeix,2 Christophe Bouvet,1 and Yves Gourinat1

1Université de Toulouse, ISAE/DMSM, Campus Supaero, 10 av. Edouard Belin BP 54032, 31055 Toulouse, France
2Université de Toulouse, INPT-ENSIACET/CIRIMAT, 118 route de Narbonne, 31077 Toulouse, France

Received 18 September 2009; Revised 5 May 2010

Copyright © 2011 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Impact resistance of different types of composite sandwich beams is evaluated by studying vibration response changes (natural frequency and damping ratio). This experimental works will help aerospace structural engineer in assess structural integrity using classification of impact resistance of various composite sandwich beams (entangled carbon and glass fibers, honeycomb and foam cores). Low velocity impacts are done below the barely visible impact damage (BVID) limit in order to detect damage by vibration testing that is hardly visible on the surface. Experimental tests are done using both burst random and sine dwell testing in order to have a better confidence level on the extracted modal parameters. Results show that the entangled sandwich beams have a better resistance against impact as compared to classical core materials.