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Uncertainty Quantification in Ultrasonic Wave Based Detection of Delamination in Composite Structures

Munian, Rajendra Kumar and Mahapatra, D Roy and Gopalakrishnan, S (2015) Uncertainty Quantification in Ultrasonic Wave Based Detection of Delamination in Composite Structures. In: 10th International Workshop on Structural Health Monitoring (IWSHM), SEP 01-03, 2015, Stanford Univ, Stanford, CA, pp. 2487-2494.

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Abstract

In this paper we consider the problem of guided wave scattering from delamination in laminated composite and further the problem of estimating delamination size and layer-wise location from the guided wave measurement. Damage location and region/size can be estimated from time of flight and wave packet spread, whereas depth information can be obtained from wavenumber modulation in the carrier packet. The key challenge is that these information are highly sensitive to various uncertainties. Variation in reflected and transmitted wave amplitude in a bar due to boundary/interface uncertainty is studied to illustrate such effect. Effect of uncertainty in material parameters on the time of flight are estimated for longitudinal wave propagation. To evaluate the effect of uncertainty in delamination detection, we employ a time domain spectral finite element (tSFEM) scheme where wave propagation is modeled using higher-order interpolation with shape function have spectral convergence properties. A laminated composite beam with layer-wise placement of delamination is considered in the simulation. Scattering due to the presence of delamination is analyzed. For a single delamination, two identical waveforms are created at the two fronts of the delamination, whereas waves in the two sub-laminates create two independent waveforms with different wavelengths. Scattering due to multiple delaminations in composite beam is studied.

Item Type: Conference Proceedings
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Additional Information: Copy right for this article belongs to the DESTECH PUBLICATIONS, INC, 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 06 Jan 2016 05:52
Last Modified: 06 Jan 2016 05:52
URI: http://eprints.iisc.ernet.in/id/eprint/53066

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