Modeling of EMI response of damaged Mindlin-Herrmann rod

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1355-1365
Journal / PublicationInternational Journal of Mechanical Sciences
Volume49
Issue number12
Publication statusPublished - Dec 2007

Abstract

To ensure high sensitivity to incipient damages, electromechanical impedance (EMI) is measured at high frequencies for damage detection. In the working high-frequency range, very high vibration modes, of the order of the thousandth mode or higher, of a structural member are likely to be activated. This imposes a great difficulty on the accurate modeling of EMI response of a structure. In this paper, the reverberation matrix method (RMM) is adopted to study the dynamics of a Mindlin-Herrmann rod with surface piezoelectric patches. The rod is inhomogeneous along the axial direction so that damage-induced reduction of cross-section or Young's modulus could be easily incorporated in the model. A piecewise-homogeneous rod model is subsequently introduced to approximate the inhomogeneous rod, along with a shear lag model of interfacial bonding between the lead zirconate titanate (PZT) patches and the host rod. An analytical expression for the electric impedance (or admittance) of the coupled model of PZT patch-bonding layer-host rod system is derived. Comparison with other established results is presented. Parametric investigations are also performed to show the dynamic properties of the coupled smart structural system. The analysis in this paper provides necessary theoretical basis for damage detection of rod via the EMI signatures. © 2007 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Electromechanical impedance, Mindlin-Herrmann rod, Piecewise-homogeneous model, Reverberation matrix method, Shear lag model

Citation Format(s)

Modeling of EMI response of damaged Mindlin-Herrmann rod. / Yan, W.; Lim, C. W.; Chen, W. Q. et al.

In: International Journal of Mechanical Sciences, Vol. 49, No. 12, 12.2007, p. 1355-1365.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review