Journal
COMPOSITE STRUCTURES
Volume 159, Issue -, Pages 257-266Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2016.09.073
Keywords
Delamination; Contact nonlinearity; Lamb waves; Higher harmonics; Spectral damage index; Locating delamination
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Funding
- Aeronautics Research and Development Board, Government of India [1642]
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In this study, a Lamb wave based nonlinear method is used to detect delamination in a composite laminate. For this purpose, an artificial delamination is created in a composite laminate using a thin Teflon sheet. The research includes an experimental study as well as finite element simulation. Two higher harmonics are observed in the Lamb wave response as a result of contact nonlinearity at the delamination. A spectral damage index is extracted from the spectral information of the fundamental and higher harmonics. It is found to be invariant to the sensor location and its values show decreasing trend with increase in the delamination width. Further, a new hybrid method is introduced, wherein the spectral and temporal data are used together in order to locate a delamination. (C) 2016 Elsevier Ltd. All rights reserved.
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