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Acoustic emission characterization of failure modes in composites with ANN

Bhat, Chandrashekhar and Bhat, MR and Murthy, CRL (2003) Acoustic emission characterization of failure modes in composites with ANN. In: Composite Structures, 61 (3). pp. 213-220.

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Abstract

Electro-rheological (ER) fluids are a class of smart materials exhibiting significant reversible changes in their rheological and hence mechanical properties under the influence of an applied electric field. Efforts are in progress to embed ER fluids in various structural elements to mitigate vibration problems. The present work is an experimental investigation of the behaviour of a sandwich beam with ER fluid acting as the core material. A starch–silicone-oil-based ER fluid is used in the present study. Significant improvements in the damping properties are achieved in experiments and the damping contributions by viscous and non-viscous forces are estimated by force-state mapping (FSM) technique. With the increase in electric field across the ER fluid from 0 to 2 kV, an increase of 25–50% in equivalent viscous damping is observed. It is observed that as concentration of starch is increased, the ER effect grows stronger but eventually is overcome by applied stresses.

Item Type: Journal Article
Additional Information: The copyright of this article belongs to Elsevier Science Ltd.
Keywords: Acoustic emission; Signal characterization; In-flight monitoring; Noise suppression; Artificial neural network
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 22 Jun 2007
Last Modified: 19 Sep 2010 04:38
URI: http://eprints.iisc.ernet.in/id/eprint/11004

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