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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 license (http://creativecommons.org/licenses/by/3.0/).
2D topography of the metal sheet surfaces: (a) with the final load force 1180.27 N; (b) with the final load force 2019.06 N; (c) with the final load force 3038.06 N; (d) 5011.10 N; (e) 8063.37 N; (f) 9009.26 N.