Wavelet based spectral finite element modelling and detection of de-lamination in composite beams

Mitra, M and Gopalakrishnan, S (2006) Wavelet based spectral finite element modelling and detection of de-lamination in composite beams. In: 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Material Conference, May 2-4 2006, USA.

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Abstract

In this paper, a model for composite beam with embedded de-lamination is developed using the wavelet based spectral finite element (WSFE) method particularly for damage detection using wave propagation analysis. The simulated responses are used as surrogate experimental results for the inverse problem of detection of damage using wavelet filtering. The WSFE technique is very similar to the fast fourier transform (FFT) based spectral finite element (FSFE) except that it uses compactly supported Daubechies scaling function approximation in time. Unlike FSFE formulation with periodicity assumption, the wavelet-based method allows imposition of initial values and thus is free from wrap around problems. This helps in analysis of finite length undamped structures, where the FSFE method fails to simulate accurate response. First, numerical experiments are performed to study the effect of de-lamination on the wave propagation characteristics. The responses are simulated for different de-lamination configurations for both broad-band and narrow-band excitations. Next, simulated responses are used for damage detection using wavelet analysis.

Item Type:	Conference Paper
Publisher:	Royal Society of Publishing
Additional Information:	Copyright of this article belongs to Royal Society of Publishing.
Keywords:	wavelet;spectral finite element;de-lamination;wave propagation;damage detection;de-noising
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	24 Nov 2011 10:08
Last Modified:	24 Nov 2011 10:08
URI:	http://eprints.iisc.ac.in/id/eprint/42195

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