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Damage detection in large composite structures using a broadband vibration method

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This paper presents a broadband vibration-based Structural Irregularity and Damage Evaluation Routine (SIDER) that uses features in complex curvature operating shapes to locate damage and other areas with structural stiffness variations. SIDER was developed for the inspection of large-scale composite structures not amenable to more conventional inspection methods. This paper extends the procedure such that it can be used on general, multi-dimensional engineering structures. Experimental results from a composite road bridge and a composite ship hull show that even when an a priori model of the structure is not available, structural variability and some manufacturing defects can be located. Damage caused over time can be detected by comparing results of an inspection with the results obtained from the structure before it is put into service. Underwater explosion testing of the ship hull deliberately caused damage, which was located using this method. The results are reported here.
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Document Type: Research Article

Affiliations: 1: United States Naval Academy, Annapolis, Maryland 2: Code 6553, Naval Surface Warfare Center, Carderock 9500 MacArthur Boulevard, West Bethesda, Maryland 20817, USA 3: Center for Composite Materials, Department of Materials Science and Engineering and Department of Civil and Environmental Engineering, University of Delaware, Newark, Delaware 19716, USA

Publication date: January 1, 2004

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