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Experimental validation of modal strain energies based damage identification method for a composite sandwich beam

Kumar, Manoj, Shenoi, R.A. and Cox, S.J. (2009) Experimental validation of modal strain energies based damage identification method for a composite sandwich beam Composites Science and Technology, 69, (10), pp. 1635-1643. (doi:10.1016/j.compscitech.2009.03.019).

Record type: Article

Abstract

A vibration-based damage identification method, based on changes in modal strain energies before and after occurrence of damage, is presented for a composite sandwich beam. Experiments were performed to obtain the natural frequencies and mode shapes for validation of the presented method. The observed changes in modal strain energies were used for the prediction of existence and location of damage in a composite sandwich beam. Subsequently, these changes were also used to predict damage extents in the two stages. In the first stage, the proposed method is used to approximate the damage extents in the face and core. These were updated to obtain more accurate values of damage extent at the second stage by using the model updating theory. Experimental and numerical results were presented to demonstrate and verify the effectiveness of this method for several single and multiple damage cases. These damage cases also include interactive damage modes. Results indicate that the proposed method is capable of identifying the location and extent of damage in the faces and core of a composite sandwich beam.

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More information

Published date: August 2009
Keywords: A. layered structures, B. defects, C. sandwich structures, B. vibration, D. non-destructive testing
Organisations: Engineering Mats & Surface Engineerg Gp, Computational Engineering and Design, Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 66399
URI: http://eprints.soton.ac.uk/id/eprint/66399
ISSN: 0266-3538
PURE UUID: 70c5e53b-c4c5-40dd-bfcb-e5882fe25a36

Catalogue record

Date deposited: 11 Jun 2009
Last modified: 19 Jul 2017 00:25

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