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The Scientific World Journal
Volume 2013 (2013), Article ID 715945, 12 pages
http://dx.doi.org/10.1155/2013/715945
Research Article

Nondestructive Damage Evaluation in Ceramic Matrix Composites for Aerospace Applications

1Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
2Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium

Received 20 April 2013; Accepted 6 June 2013

Academic Editors: D. Ouinas and K. N. Shivakumar

Copyright © 2013 Konstantinos G. Dassios et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Infrared thermography (IRT) and acoustic emission (AE) are the two major nondestructive methodologies for evaluating damage in ceramic matrix composites (CMCs) for aerospace applications. The two techniques are applied herein to assess and monitor damage formation and evolution in a SiC-fiber reinforced CMC loaded under cyclic and fatigue loading. The paper explains how IRT and AE can be used for the assessment of the material’s performance under fatigue. IRT and AE parameters are specifically used for the characterization of the complex damage mechanisms that occur during CMC fracture, and they enable the identification of the micromechanical processes that control material failure, mainly crack formation and propagation. Additionally, these nondestructive parameters help in early prediction of the residual life of the material and in establishing the fatigue limit of materials rapidly and accurately.