Data Merging of AE Sensors with Different Frequency Resolution for the Detection and Identification of Damage in Oxide-Based Ceramic Matrix Composites.

Nicolas Guel,Aude Paillassa,Olivier Caty,Nathalie Godin,Zeina Hamam,Florent Bouillon,Pascal Reynaud

doi:10.3390/ma13204691

Abstract

In this paper, acoustic emission data fusion based on multiple measurements is presented for damage detection and identification in oxide-based ceramic matrix composites. Multi-AE (acoustic emission) sensor fusion is considered with the aim of a better identification of damage mechanisms. In this context, tensile tests were conducted on ceramic matrix composites, fabricated with 3M™ Nextel™ 610 fibers and aluminosilicate matrix, with two kinds of AE sensors. Redundant and complementary sensor data were merged to enhance AE system capability and reliability. Data fusion led to consistent signal clustering with an unsupervised procedure. A correlation between these clusters and the damage mechanisms was established thanks to in situ observations. The complementarity of the information from both sensors greatly improves the characterization of sources for their classification. Moreover, this complementarity allows features to be perceived more precisely than using only the information from one kind of sensor.

Highlights

Ceramic matrix composites (CMCs) are planned to be inserted into a new generation of civil aircraft engines
To address the above limitations on the effects of acoustic emission (AE) sensors, this paper proposes a multi-AE sensor data fusion in order to monitor the damage kinetics and to identify damage mechanisms that occur in oxide-based CMCs
An approach is proposed to merge the data from two different types of AE sensors in the classification process

Summary

Introduction

Ceramic matrix composites (CMCs) are planned to be inserted into a new generation of civil aircraft engines. Their excellent thermomechanical properties and their low density are suitable for the requirements of hot components. In parallel with SiC-based CMCs, oxide-based CMCs have been developed to replace metallic rear parts of the engine. Non-oxide ceramic composites suffer from limits at elevated temperatures in terms of oxidation resistance. Oxide–oxide ceramic matrix composites [1,2,3,4,5,6] have been developed due to their promising high-temperature performance; they offer good stability against corrosive and oxidative atmospheres.

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Conclusion