Nonlinear ultrasound (NLU) is a nondestructive evaluation method that is sensitive to damage at length scales well below those detected by conventional ultrasonic methods. Micro- and nano-scale damage correlates to the second harmonic generated by a sinusoidal wave as it propagates through a material. However, NLU measurements are plagued by experimentally-induced nonlinearities and require careful calibrations that have limited them to laboratory measurements. Here, we propose the use of additive manufacturing (AM) phononic materials with ultrasonic filtering properties to reduce extraneous nonlinearities. To do this, finite element simulations were first used to design and analyze phononic materials to transmit an ultrasonic wave but forbid the propagation of its second harmonic. Phononic filters were then fabricated with AM and experimentally characterized in the ultrasonic regime. Results show that the phononic materials behave as low-pass filters, where the cut-off frequency is controlled by the unit cell geometry and also influenced by defects and microstructure from the AM process. Finally, the phononic filters were incorporated into NLU measurements, demonstrating the removal of extraneous nonlinearities and thus better isolating second harmonic generation in a test sample. This work suggests that AM phononic materials could improve NLU and other nondestructive evaluation measurements.
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June 2021
June 02 2021
Metal additively manufactured phononic materials as ultrasonic filters in nonlinear ultrasound measurementsa)
Special Collection:
Additive Manufacturing and Acoustics
Elizabeth J. Smith
;
Elizabeth J. Smith
b)
Mechanical Science and Engineering, University of Illinois at Urbana-Champaign
, Urbana, Illinois 61801, USA
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Kathryn H. Matlack
Kathryn H. Matlack
c)
Mechanical Science and Engineering, University of Illinois at Urbana-Champaign
, Urbana, Illinois 61801, USA
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b)
ORCID: 0000-0002-6210-5006.
c)
Electronic mail: kmatlack@illinois.edu, ORCID: 0000-0001-7387-2414.
a)
This paper is part of a special issue on Additive Manufacturing and Acoustics.
J. Acoust. Soc. Am. 149, 3739–3750 (2021)
Article history
Received:
November 30 2020
Accepted:
April 26 2021
Citation
Elizabeth J. Smith, Kathryn H. Matlack; Metal additively manufactured phononic materials as ultrasonic filters in nonlinear ultrasound measurements. J. Acoust. Soc. Am. 1 June 2021; 149 (6): 3739–3750. https://doi.org/10.1121/10.0004995
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