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An experimental study on second harmonic generation of guided wave in fatigued spring rod

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Abstract

Conventional ultrasonic inspection techniques especially ultrasonic guided wave and wave testing methods show excellent capability for evaluating the material integrity of the structures. The dominate characteristics of nonlinear guided wave testing are long-range testing and higher sensitivity through various modes selection, which are favorable for diagnosing micro-defects or micro-structural changes at early stage. In this study, nonlinear studies on the valve spring coil using nonlinear induced ultrasound conducted. The nonlinear guided ultrasonic test performed on four specimens subjected to the Nakamura fatigue test. Experimental results show that nonlinear parameters increase with increasing distance. In addition, the nonlinear parameters increased with increasing fatigue degree. This study suggests a method to diagnose early damage of machine structure in an appropriate way and it expected to prevent accidents of structures.

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Abbreviations

β l :

Longitudinal second harmonic nonlinear parameter

ρ :

Density

c l :

Velocity of the longitudinal wave

A l :

Amplitude of the primary harmonic

A 2 :

Amplitude of the second harmonic

k :

Wave number

x :

Propagating distance

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Acknowledgments

This work was supported by Daewon Kang Up Co., Ltd. and National Research Foundation of Korea (NRF) grant funded by Korea government (MSIT) (No.2016M2A2 A9A03913295).

Author information

Authors and Affiliations

  1. Graduate School of Mechanical Engineering, Pusan National University, Busan, 46241, Korea

    Jeongnam Kim

  2. Shandong Special Equipment Inspection Institute Co. Ltd., Shandong, China

    Bo Zhu

  3. School of Mechanical Engineering, Pusan National University, Busan, 46241, Korea

    Younho Cho

Authors
  1. Jeongnam Kim
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  2. Bo Zhu
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  3. Younho Cho
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Corresponding author

Correspondence to Younho Cho.

Additional information

Recommended by Associate Editor Daeil Kwon

Younho Cho is a Professor of the School of Mechanical Engineering, Pusan National University, Pusan, Korea. He received his master degree in Pennsylvania State University. And he is the leader of the Wave & SHM Lab.

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Kim, J., Zhu, B. & Cho, Y. An experimental study on second harmonic generation of guided wave in fatigued spring rod. J Mech Sci Technol 33, 4105–4109 (2019). https://doi.org/10.1007/s12206-019-0805-0

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  • DOI: https://doi.org/10.1007/s12206-019-0805-0

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