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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/).
Criteria governing thick plate, thin plate, and membrane cases based on the side-to-thickness ratio a/h (a > b). (a) The plate theory range according to a/h; (b) the tendency of thickness and flexural mode according to a/h.