Abstract
Based on the classical theory of laser ultrasound generation in the thermoelastic regime, the generation of ultrasound by the irradiation of a laser array source is simulated by the finite element method. The interaction of ultrasound with a surface-breaking crack is studied. By changing the space distribution of a simultaneously triggered laser array source, narrow-band acoustic waves can be obtained. The characteristics of the narrow-band acoustic waves in the frequency domain are analyzed. By comparing with the spectrum of wide-band reflected acoustic waves generated by a single laser source, the mechanism of the interaction of a surface-breaking crack on the reflected narrow-band acoustic waves is studied. According to the variation of a reflected narrow-band acoustic wave spectrum on cracks with different depths, the influence of the crack-depth variation on different components of the narrow-band acoustic waves is obtained. Results suggest that the narrow-band acoustic waves could also be sensitive to the variation of the crack depth so that it can provide an alternative option for crack-depth gaging using all-optical methods.
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Acknowledgments
This paper is supported by the National Natural Science Foundation of China under Grant No. 61405093, the Natural Science Foundation of Jiangsu Province under Grant No. BK20140771, and the financial support for the start-up scientific research of the Nanjing University of Science and Technology.
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Ni, C., Dong, L., Li, J. et al. Study of Laser-Array-Source-Generated Narrow-Band Acoustic Waves Interacting with Surface-Breaking Cracks Using Finite Element Method. Int J Thermophys 36, 1266–1273 (2015). https://doi.org/10.1007/s10765-015-1865-8
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DOI: https://doi.org/10.1007/s10765-015-1865-8