Damage assessment of composite plate structures with material and measurement uncertainty

Chandrashekhar, M and Ganguli, Ranjan (2016) Damage assessment of composite plate structures with material and measurement uncertainty. In: MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 75 . pp. 75-93.

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Abstract

Composite materials are very useful in structural engineering particularly in weight sensitive applications. Two different test models of the same structure made from composite materials can display very different dynamic behavior due to large uncertainties associated with composite material properties. Also, composite structures can suffer from pre-existing imperfections like delaminations, voids or cracks during fabrication. In this paper, we show that modeling and material uncertainties in composite structures can cause considerable problein in damage assessment. A recently developed C-0 shear deformable locking free refined composite plate element is employed in the numerical simulations to alleviate modeling uncertainty. A qualitative estimate of the impact of modeling uncertainty on the damage detection problem is made. A robust Fuzzy Logic System (FLS) with sliding window defuzzifier is used for delamination damage detection in composite plate type structures. The FLS is designed using variations in modal frequencies due to randomness in material properties. Probabilistic analysis is performed using Monte Carlo Simulation (MCS) on a composite plate finite element model. It is demonstrated that the FLS shows excellent robustness in delamination detection at very high levels of randomness in input data. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Publisher:	ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belongs to the ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
Keywords:	Damage detection; Composite plates; Delamination damage; Material uncertainty; Fuzzy logic
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	23 Apr 2016 05:01
Last Modified:	23 Apr 2016 05:01
URI:	http://eprints.iisc.ac.in/id/eprint/53669

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