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Proceedings 2018, 2(8), 492; https://doi.org/10.3390/ICEM18-05422

Mechanoluminescent Materials: A New Way to Analyze Stress by Light

1
LumiLab, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, 9000 Ghent, Belgium
2
Center for Nano- and BioPhotonics (NB-Photonics), Ghent University, 9000 Ghent, Belgium
3
Mechanics of Materials and Structures (MMS), Department of Materials, Textiles and Chemical Engineering (MaTCh), Ghent University, Campus A 903, 9052 Zwijnaarde, Belgium
Presented at the 18th International Conference on Experimental Mechanics (ICEM18), Brussels, Belgium, 1–5 July 2018.
*
Author to whom correspondence should be addressed.
Published: 30 June 2018
PDF [1000 KB, uploaded 18 July 2018]

Abstract

The monitoring of stress changes in structural components under various kinds of dynamical loading is crucial for the assessment of their integrity and lifetime. In addition to many methodologies available, such as strain gauges, optical fiber sensors, X-Ray diffraction and digital image correlation, we introduce a novel non-contact method to visualize stress distributions based on mechanoluminescence (ML). ML is a phenomenon occurring in some materials that emit light upon an applied stress level. In this paper, we develop the ML material (Ca0.4Sr0.6)Al2Si2O8:1%Eu2+,1%Ho3+, a glow-in-the-dark material, to visualize stress distribution in a disc, as well as the stress field of an ultrasonic transducer. The properties of defects in the ML phosphors, which are responsible for ML in this material, are vital for stress visualization.
Keywords: mechanoluminescence; anorthite; stress visualization; acoustically induced piezoluminescence; Von Mises stress mechanoluminescence; anorthite; stress visualization; acoustically induced piezoluminescence; Von Mises stress
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. (CC BY 4.0).
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Feng, A.; Michels, S.; Lamberti, A.; Smet, P.F. Mechanoluminescent Materials: A New Way to Analyze Stress by Light. Proceedings 2018, 2, 492.

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