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Open AccessArticle

Identification of a Critical Time with Acoustic Emission Monitoring during Static Fatigue Tests on Ceramic Matrix Composites: Towards Lifetime Prediction

INSA de Lyon, MATEIS (UMR CNRS 5510), 7 avenue Jean Capelle, 69621 Villeurbanne Cedex, France
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This paper is an extended version of paper presented in the 6th International Conference on Emerging Technologies in Non-destructive Testing (ETNDT6), Brussels, Belgium, 27–29 May 2015.
Academic Editor: Dimitrios G. Aggelis
Appl. Sci. 2016, 6(2), 43; https://doi.org/10.3390/app6020043
Received: 15 December 2015 / Revised: 19 January 2016 / Accepted: 21 January 2016 / Published: 3 February 2016
(This article belongs to the Special Issue Acoustic and Elastic Waves: Recent Trends in Science and Engineering)
Non-oxide fiber-reinforced ceramic-matrix composites are promising candidates for some aeronautic applications that require good thermomechanical behavior over long periods of time. This study focuses on the behavior of a SiCf/[Si-B-C] composite with a self-healing matrix at intermediate temperature under air. Static fatigue experiments were performed below 600 °C and a lifetime diagram is presented. Damage is monitored both by strain measurement and acoustic emission during the static fatigue experiments. Two methods of real-time analysis of associated energy release have been developed. They allow for the identification of a characteristic time that was found to be close to 55% of the measured rupture time. This critical time reflects a critical local energy release assessed by the applicability of the Benioff law. This critical aspect is linked to a damage phase where slow crack growth in fibers is prevailing leading to ultimate fracture of the composite. View Full-Text
Keywords: ceramic matrix composite; static fatigue; lifetime assessment estimation; mechanical behavior; acoustic emission; damage identification ceramic matrix composite; static fatigue; lifetime assessment estimation; mechanical behavior; acoustic emission; damage identification
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Godin, N.; Reynaud, P.; R’Mili, M.; Fantozzi, G. Identification of a Critical Time with Acoustic Emission Monitoring during Static Fatigue Tests on Ceramic Matrix Composites: Towards Lifetime Prediction. Appl. Sci. 2016, 6, 43.

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