Special Issue: Dynamics of Smart Materials and Structures; Guest Editors: Grzegorz Litak, Emil Manoach and Gabriel AbadalNo Access

Delamination Assessment in Structures Made of Composites Based on General Signal Correlation

Irina Trendafilova

Department of Mechanical and Aeronautical Engineering, University of Strathclyde, 75 Montrose Street G1 1XJ, Glasgow, UK

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Roberto Palazzetti

Department of Design, Manufacture and Engineering Management, University of Strathclyde, 75 Montrose Street G1 1XJ, Glasgow, UK

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, and

Andrea Zucchelli

Department of Mechanical Engineering, University of Bologna, Viale Risorgimento 2, 40135 Bologna, Italy

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https://doi.org/10.1142/S0219455414400227Cited by:12 (Source: Crossref)

Abstract

This paper considers a vibration-based damage assessment approach which is based on the general idea for signal cross-correlation. Here the method is demonstrated and validated on a composite laminate beam and it is applied for the purposes of delamination assessment in composite structures. The method uses two measures of cross-correlation between two vibration signals measured in different points on the structure in order to diagnose the delamination. The linear cross-correlation as well as a new measure for nonlinear cross-correlation, the mutual information, are introduced and applied for the purposes of delamination assessment. The delamination assessment is based on the comparison of the measures for the healthy and the damaged state of the structure. In this study, the method is applied using the free decay responses of the beam. Two delamination indices are introduced and they are used for the purposes of delamination detection and localization.

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