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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/).
Prediction of the relative maximum compressive force Frel as a function of the slenderness of the sample by (a) linear equation, (b) second degree polynomial, and (c) third-degree polynomial.