Investigation Into Vibration Characteristic in Vibrothermography

Abstract

Vibration characteristic plays an important role in vibrothermography, which directly affects the heating during the test. In this work, involving all the contacts in the vibrothermography, the “double-mass-three-spring” model is established to explore the vibration characteristic. The obtained results show that ultrasonic gun vibrates at fundamental frequency (FF), while the specimen vibrates at multi-frequencies including FF, 2FF, 3FF, and 4FF, which is validated through experimental investigation results. Additionally, the model proposed in this work reveals a high order harmonics in the vibrothermography test and makes the specimen conduct the steady vibration, which indicates that the model is closer to the practical equipment and can ensure the heating efficiency induced by vibration of specimen to improve the detection capability.

Keywords

Vibrothermography / vibration characteristic / “double-mass-three-spring” model

References

[1] Rizi A. S., Hedayatrasa S., Maldgue X., Vukhanh T.. FEM^modeling of ultrasonic vibrothermography of a damaged plate and qualitative study of heating mechanisms. Infrared Physics & Technology, 2013, 61(5): 101-110.

[2] Montanini R., Freni F.. Correlation between vibrational mode shapes and viscoelastic heat generation in vibrothermography. NDT & E^International, 2013, 58, 43-48.

[3] Han X. Y., Li W., Zeng Z., Favro L. D., Thomas R. L.. Acoustic chaos and sonic infrared imaging. Applied Physics Letters, 2002, 81(17): 3188-3190.

[4] Han X. Y., Zeng Z., Li W., Islam M. S., Lu J. P., Loggins V., . Acoustic chaos for enhanced detectability of cracks by sonic infrared imaging. Journal of Applied Physics, 2004, 95(7): 3792-3797.

[5] Solodov I., Wackerl J., Pfleiderer K., Busser G.. Nonlinear self-modulation and subharmonic acoustic spectroscopy for damage detection and location. Applied Physics Letters, 2004, 84(26): 5386-5388.

[6] Han X. Y., Loggoms V., Zeng Z., Favro L. D., Thomas R. L.. Mechanical model for the generation of acoustic chaos in sonic infrared imaging. Applied Physics Letters, 2004, 85(8): 1332-1334.

[7] Zheng K., Zhang H., Zhang S. Y., Fan L.. A^dynamical model of subharmonic generation in ultrasonic infrared thermography. Ultrasonics, 2006 44.

[8] Chen Z. J., Zhang S. Y., Zheng K.. Nonlinear vibration in metal plate excited by high-power ultrasonic pulses. Acta Physica Sinica, 2010, 59(6): 4071-4083.

[9] Feng F. Z., Zhang C. S., Min Q. X., Wang P. F.. Effect of engagement force on vibration characteristics in sonic IR^imaging. Ultrasonics, 2015, 56, 473-476.

[10] Tian G., Yang Z. W., Zhu J. T., Zhang W., Luo W. Y.. Vibration characteristic and acoustic chaos analysis of ultrasonic infrared thermal wave test. Infrared and Laser Engineering, 2016, 45(3): 0304003.