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. 2021 Jul 6;14(14):3786. doi: 10.3390/ma14143786

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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 (https://creativecommons.org/licenses/by/4.0/).

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Stiffness degradation in a sample DW: (a) F-15; (b) F-30; (c) F-45; (d) F-60; (e) F-75. Three types of perforation were analyzed (2/6 mm, 4/4 mm, or 6/2 mm).

Stiffness degradation in a sample DW: (a) F-15; (b) F-30; (c) F-45; (d) F-60; (e) F-75. Three types of perforation were analyzed (2/6 mm, 4/4 mm, or 6/2 mm).