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. 2021 Jan 23;14(3):544. doi: 10.3390/ma14030544

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Example of the signal analysis/interpretation for (a) the bender element tests for specimen S11, p′ = 45 kPa, f = 10 kHz, and (b) the extender element tests for specimen S12, p′ = 90 kPa, f = 12.5 kHz.