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Proceedings Paper

A guided wave approach for the detection of damage in a structure having elements with periodic damage
Author(s): Sushovan Mukherjee; S. Gopalakrishnan
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Paper 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.

Paper Details

Date Published: 17 April 2013
PDF: 8 pages
Proc. SPIE 8695, Health Monitoring of Structural and Biological Systems 2013, 86951V (17 April 2013); doi: 10.1117/12.2009334
Show Author Affiliations
Sushovan Mukherjee, Indian Institute of Science (India)
S. Gopalakrishnan, Indian Institute of Science (India)

Published in SPIE Proceedings Vol. 8695:
Health Monitoring of Structural and Biological Systems 2013
Tribikram Kundu, Editor(s)

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