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Proceedings Paper

Damage sensitivity investigations of EMI technique on different materials through coupled field analysis
Author(s): Bhrigu Joshi; Sailesh Adhikari; Suresh Bhalla
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Paper Abstract

This paper presents a comparative study through the piezoelectric coupled field analysis mode of finite element method (FEM) on detection of damages of varying magnitude, encompassing three different types of structural materials, using piezo impedance transducers. An aluminum block, a concrete block and a steel block of dimensions 48×48×10 mm were modelled in finite element software ANSYS. A PZT patch of 10×10×0.3 mm was also included in the model as surface bonded on the block. Coupled field analysis (CFA) was performed to obtain the admittance signatures of the piezo sensor in the frequency range of 0-250 kHz. The root mean square deviation (RMSD) index was employed to quantify the degree of variation of the signatures. It was found that concrete exhibited deviation in the signatures only with the change of damping values. However, the other two materials showed variation in the signatures even with changes in density and elasticity values in a small portion of the specimen. The comparative study shows that the PZT patches are more sensitive to damage detection in materials with low damping and the sensitivity typically decreases with increase in the damping.

Paper Details

Date Published: 20 April 2016
PDF: 13 pages
Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 98032J (20 April 2016); doi: 10.1117/12.2222031
Show Author Affiliations
Bhrigu Joshi, The Northcap Univ. (India)
Sailesh Adhikari, Indian Institute of Technology Delhi (India)
Suresh Bhalla, Indian Institute of Technology Delhi (India)

Published in SPIE Proceedings Vol. 9803:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016
Jerome P. Lynch, Editor(s)

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