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A Guided Wave approach for the detection of damage in a structure having elements with periodic damage

Mukherjee, Sushovan and Gopalakrishnan, S (2013) A Guided Wave approach for the detection of damage in a structure having elements with periodic damage. In: Conference on Health Monitoring of Structural and Biological Systems, 11-14, 2013, San Diego.

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Official URL: http://dx.doi.org/10.1117/12.2009334

Abstract

A wave propagation based approach for the detection of damage in components of structures having periodic damage has been proposed. Periodic damage pattern may arise in a structure due to periodicity in geometry and in loading. The method exploits the Block-Floquet band formation mechanism, a feature specific to structures with periodicity, to identify propagation bands (pass bands) and attenuation bands (stop bands) at different frequency ranges. The presence of damage modifies the wave propagation behaviour forming these bands. With proper positioning of sensors a damage force indicator (DFI) method can be used to locate the defect at an accuracy level of sensor to sensor distance. A wide range of transducer frequency may be used to obtain further information about the shape and size of the damage. The methodology is demonstrated using a few 1-D structures with different kinds of periodicity and damage. For this purpose, dynamic stiffness matrix is formed for the periodic elements to obtain the dispersion relationship using frequency domain spectral element and spectral super element method. The sensitivity of the damage force indicator for different types of periodic damages is also analysed.

Item Type: Conference Proceedings
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Additional Information: Conference on Health Monitoring of Structural and Biological Systems, San Diego, CA, MAR 11-14, 2013
Keywords: Copyright for this article belongs to the SPIE-INT SOC OPTICAL ENGINEERING
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 04 Oct 2013 06:29
Last Modified: 04 Oct 2013 06:29
URI: http://eprints.iisc.ernet.in/id/eprint/47532

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