A spectral finite element with embedded delamination for modeling of wave scattering in composite beams

Nag, A and Mahapatra, Roy D and Gopalakrishnan, S and Sankar, TS (2003) A spectral finite element with embedded delamination for modeling of wave scattering in composite beams. In: Composites Science and Technology, 63 (15). pp. 2187-2200.

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Abstract

A spectral finite element for modeling of wave scattering in laminated composite beam with embedded delamination is proposed. The method uses fast Fourier transform (FFT) for transformation of the temporal variables into frequency dependent variables and conventional node-based finite element (FE) approach for spatial discretization in frequency domain. The base-laminates and the sub-laminates are treated as structural waveguides, which form the internal spectral elements. The region of delamination is modeled by assuming constant cross-sectional rotation, Equilibrium at the interfaces between the base-laminate and the sub-laminates is imposed using efficient matrix methodology. The internal element nodes are finally condensed to form a single equivalent beam element with embedded delamination and is called damaged spectral element. Only three quantities need to be specified for automated construction of the proposed element. These are the local coordinates of one of the delamination length. The main advantage is easy insertion of delamination in finite element model and efficient correlation of measured waveforms is structural health monitoring applications. Response predicted by the proposed model has been compared with 2D FE analysis and fairly matching results are found, Sensitivity studies due to parametric variation in delaminated configuration are performed. Methodologies to identify locations and extent of delaminations for structural diagnostics are also highlighted.

Item Type:	Journal Article
Publication:	Composites Science and Technology
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	C. Laminated composite;C. Delamination;Waveguide
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	30 Jun 2008
Last Modified:	19 Sep 2010 04:37
URI:	http://eprints.iisc.ac.in/id/eprint/10701

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