Fatigue damage stages in unidirectional glass-fiber-epoxy composites: identification through acoustic emission technique

Bhat, MR and Murthy, CRL (1993) Fatigue damage stages in unidirectional glass-fiber-epoxy composites: identification through acoustic emission technique. In: International Journal of Fatigue, 15 (5). pp. 401-405.

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Abstract

Fatigue damage in composites occurs in stages. Before attempting to estimate quantitatively the extent of cumulative damage which is necessary to estimate the fatigue life of these materials, it is useful to understand the basic process in relation to the significance of the stages of damage. The acoustic emission (AE) technique, with its on-line monitoring capability, has the potential to be the most suitable candidate as a tool for this purpose. Experimental investigations were carried out on unidirectional glass-fibre-reinforced plastic (GFRP) composite coupons to explore the feasibility of identifying the damage stages using acoustic emission. The coupons were subjected to constant-amplitude load cycles with continuous AE monitoring. The results of the experiments show three distinct stages of damage before the final failure of coupons; these stages could be correlated to different failure mechanisms.

Item Type:	Journal Article
Publication:	International Journal of Fatigue
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	acoustic emission;composites;failure mechanisms;fatigue damage;on-line monitoring
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	30 Jun 2008
Last Modified:	19 Sep 2010 04:46
URI:	http://eprints.iisc.ac.in/id/eprint/14610

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