| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Simultaneous Measurements of Harmonic Waves at Fatigue-Cracked Interfaces |
| Hyunjo Jeong1**, Dan Barnard2 |
1Division of Mechanical and Automotive Engineering, Wonkwang University, Iksan, Jeonbuk 570-749, Korea
2Center for Nondestructive Evaluation, Iowa State University, Ames, IA 50010, USA
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| Cite this article: |
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Hyunjo Jeong, Dan Barnard 2011 Chin. Phys. Lett. 28 084302 |
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Abstract Nonlinear harmonic waves generated at cracked interfaces are investigated theoretically and experimentally. A compact tension specimen is fabricated and the amplitude of the transmitted wave is analyzed as a function of position along the fatigued crack surface. In order to measure as many nonlinear harmonic components as possible, broadband lithium niobate (LiNbO3) transducers are employed together with a calibration technique for making absolute amplitude measurements with fluid−coupled receiving transducers. Cracked interfaces are shown to generate high acoustic nonlinearities, which are manifested as harmonics in the power spectrum of the received signal. The first subharmonic f/2 and the second harmonic 2f waves are found to be dominant nonlinear components for an incident toneburst signal of frequency f. To explain the observed nonlinear behavior, a partially closed crack is modeled by planar half interfaces that can account for crack parameters, such as crack opening displacement and crack surface conditions. The simulation results show reasonable agreement with the experimental results.
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| Keywords:
43.25.Dc
43.25.Zx
43.25.Ba
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Received: 06 January 2011
Published: 28 July 2011
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| PACS: |
43.25.Dc
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(Nonlinear acoustics of solids)
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43.25.Zx
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(Measurement methods and instrumentation for nonlinear acoustics)
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43.25.Ba
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(Parameters of nonlinearity of the medium)
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