ASNT NDT Library

This paper introduces a new NDT technique that uses mechanoluminescence sensing materials. The mechanoluminescent sensor technology detects cracks and material discontinuities visually through the application of luminescent materials embedded in a coating. The technology does not require expensive analytical equipment or highly skilled operators. The technology can be applied to a variety of materials, requires little skill to diagnose problems, is less hazardous than other options, is indifferent to the direction of the discontinuity, and provides full-field crack and stress visualization. The following sections describe: what the mechanoluminescence phenomenon is; how the mechanoluminescent sensor and NDT system can be manufactured; how material discontinuities can be detected by the mechanoluminescent NDT system; how quantitative strains can be measured by the mechanoluminescent sensor; advantages and disadvantages of the mechanoluminescent sensor and NDT system; and application examples of strain sensing and crack detection by the mechanoluminescent sensing materials. The last section presents a conclusion.

Chandra, V.K., and B.P. Chandra, “Suitable Materials for Elastico Mechanoluminescence-based Stress Sensors,” Optical Materials, Vol. 34, No. 1, 2011, pp. 194–200.
Chang, C.W., P.H. Chen, H.S. Lien, “Evaluation of Residual Stress in Pre-stressed Concrete Material by Digital Image Processing Photoelastic Coating and Hole Drilling Method,” Measurement, Vol. 42, No. 4, 2009, pp. 552–558.
De Nicola, S., P. Ferraro, I. Gurov, R. Koviazin, and M. Volkov, “Fringe Analysis for Moiré Interferometry by Modification of the Local Intensity Histogram and Use of a Two-dimensional Fourier Transform Method,” Measurement Science and Technology, Vol. 11, No. 9, 2000, pp. 1328–1334.
Fujio, Y., C. Xu, M. Nishibori, Y. Teraoka, K. Kamitani, N. Tarasaki, and N. Ueno, “Development of Highly Sensitive Mechanoluminescent Sensor Aiming at Small Strain Measurement,” Journal of Advanced Dielectrics, Vol. 4, No. 2, 2014.
Jha, P., and B.P. Chandra, “Survey of the Literature on Mechanoluminescence from 1605 to 2013,” Luminescence, Vol. 29, No. 8, 2014, pp. 977–993.
Kim, J.S., and G.W. Kim, “New Non-contacting Torque Sensor Based on the Mechanoluminescence of ZnS:Cu Microparticles,” Sensors and Actuators A: Physical, Vol. 218, October 2014, pp. 125–131.
Kim, J.S., Y.N. Kwon, and K.S. Sohn, “Dynamic Visualization of Crack Propagation and Bridging Stress using the Mechano-luminescence of SrAl2O4:(Eu,Dy,Nd), Acta Materialia, Vol. 51, No. 20, 2003, pp. 6437–6442.
Pan, B., “Recent Progress in Digital Image Correlation,” Experimental Mechanics, Vol. 51, No.7, 2011, pp. 1223–1235.
Rahimi, M.R., G.J. Yun, G.L. Doll, and J.S. Choi, “Effects of Persistent Luminescence Decay on Mechanoluminescence Phenomena of SrAl2O4:Eu2+, Dy3+ Materials,” Optics Letters, Vol. 38, No. 20, 2013, pp. 4134–4137.
Sohn, K.S., M.Y. Cho, M. Kim, and J.S. Kim, “A Smart Load-sensing System using Standardized Mechano-luminescence Measurement,” Optics Express, Vol. 23, No. 5, 2015, pp. 6073–6082.
Terasaki, N., C.H. Xu, C. Li, L. Zhang, C. Li, D. Ono, M. Tsubai, Y. Adachi, Y. Imai, N. Ueno, and T. Shinokawa, “Visualization of Active Crack on Bridge in use by Mechanoluminescent Sensor,” SPIE Proceedings, Civil Infrastructure II: Bridge Monitoring, Vol. 8348, San Diego, California, 2012a.
Terasaki, N., C. Li, L. Zhang, and C.N. Xu, “Active Crack Indicator with Mechanoluminescent Sensing Technique: Detection of Crack Propagation on Building,” IEEE Sensors Applications Symposium, Brescia, Italy, 2012b.
Xu, C.N., T. Watanabe, M. Akiyama, and X.G. Zheng, “Direct View of Stress Distribution in Solid by Mechanoluminescence,” Applied Physics Letters, Vol. 74, No. 17, 1999, pp. 2414–2416.
Xu, C.N., X.G. Zheng, M. Akiyama, K. Nonaka, and T. Watanabe, “Dynamic Visualization of Stress Distribution by Mechanoluminescence Image,” Applied Physics Letters,
Vol. 76, No. 2, 2000, pp. 179–181.
Yun, G.J., M.R. Rahimi, A.H. Gandomi, G.C. Lim, and J.S. Choi, “Stress Sensing Performance using Mechanoluminescence of SrAl2O4:Eu (SAOE) and SrAl2O4:Eu, Dy (SAOED) under Mechanical Loadings,” Smart Materials and Structures, Vol. 22, No. 5, 2013.

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