Lamb wave interaction with composite delamination

Munian, Rajendra Kumar and Mahapatra, D Roy and Gopalakrishnan, S (2018) Lamb wave interaction with composite delamination. In: COMPOSITE STRUCTURES, 206 . pp. 484-498.

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Abstract

Elastic guided wave based evaluation is useful to detect delamination in composites. This paper reports a detailed account of guided wave interaction with delamination in laminated composites modeled using time domain spectral finite element (TSFE) method. Wave scattering due to different delamination positions is studied. Wave field near the delamination in different layer-wise positions is investigated, which is useful to further characterize and correlate the far field wave packet carrying the parametric signature of delamination. Off-axis delamination in composite laminate creates an asymmetry in the elastodynamic stress transfer. It leads to wave mode conversions. Sensitivity of the delamination to the wavelengths is studied. The outcome of this study indicates potential possibilities to use frequency-wavelength information to discriminate various sizes of delamination. Energy of the scattered waves and dissipation/conversion of the wave energy due to the defects depend on the resonance characteristics of the sub-laminates. Wave scattering effect due to length-wise multiple delaminations and edge delamination is also analyzed. The resonance patterns in the signals are analyzed with reference to the defect quantification problem.

Item Type:	Journal Article
Publication:	COMPOSITE STRUCTURES
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copy right for this article belong to ELSEVIER SCI LTD
Keywords:	Time domain spectral finite element method; Lamb waves; Ultrasonic; Composite; Damage detection; Delamination
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	19 Nov 2018 14:42
Last Modified:	19 Nov 2018 14:42
URI:	http://eprints.iisc.ac.in/id/eprint/61094

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