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Proceedings Paper

Higher and sub-harmonic Lamb wave mode generation due to debond-induced contact nonlinearity
Author(s): Anurup Guha; C. R. Bijudas
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Paper Abstract

Non-cumulative higher and sub-harmonic Lamb wave mode generation as a result of partial-debond of piezoelectric wafer transducers (PWT) bonded onto an Aluminium plate, is numerically investigated and experimentally validated. The influence of excitation frequency on the extent of nonlinearity due to clapping mechanism of the partially-debonded PWTs is discussed. A set of specific frequency range is arrived at based on the Eigen-value and Harmonic analyses of PWTs used in the model. It is found that, at these frequencies, which are integral multiple of the first width-direction mode of a PWT, significantly higher amplitudes of higher-harmonics are observed. It is also seen that at specific debond-positions and lengths, sharp sub-harmonics in addition to higher-harmonics are present. Signal processing is carried out using Fast Fourier transform, which is normalized for comparisons.

Paper Details

Date Published: 1 April 2016
PDF: 20 pages
Proc. SPIE 9805, Health Monitoring of Structural and Biological Systems 2016, 98050X (1 April 2016); doi: 10.1117/12.2218611
Show Author Affiliations
Anurup Guha, Indian Institute of Space Science and Technology (India)
C. R. Bijudas, Indian Institute of Space Science and Technology (India)


Published in SPIE Proceedings Vol. 9805:
Health Monitoring of Structural and Biological Systems 2016
Tribikram Kundu, Editor(s)

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