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oai:recercat.cat:2117/4437962026-01-29T04:32:51Zcom_2072_1033col_2072_452950

General results for loading and unloading rough elasto-plastic interfaces Pérez Rafols, Francisco Liang, Xuan-Ming Ciavarella, Michele Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC Universitat Politècnica de Catalunya. RIIS - Grup de Recerca en Recursos i Indústries Intel·ligents i Sostenibles Àrees temàtiques de la UPC::Enginyeria mecànica Rough surfaces Plasticity Indentation Stiffness From the classical model of Bowden and Tabor it is known that metallic materials make contact only on a small fraction of the nominal contact area, where pressure is so high that plastic deformations is likely. While the contact area has been extensively studied within this context, indentation has attracted less attention. In this work we thus characterize the relationship between load and indentation for nominally flat Gaussian surfaces, finding universal trends which persist when either the level of plasticity or the indentation depth change. We study both loading and unloading trends. Also, we discuss the height distribution of the surfaces resulting from cumulative plastic deformation. For all this cases, we obtain very simple and closed form analytical fittings that allow a convenient and general use of the results here presented. Finally, we compare the results obtained from the model, based on Boundary Element model and perfect plasticity, with experimental result, to justify the validity of its use. FPR received funding support from the Spanish Ministry of Science and Innovation through grant PID2021-407 126614OB-I00 and from the research group RIIS-UPC. XML received funding from the National Natural Science Foundation of China (Grant No. 12302126). MC received no funding. Peer Reviewed Postprint (published version) 2025-10-10 Article Pérez-Ràfols, F.; Liang, X.; Ciavarella, M. General results for loading and unloading rough elasto-plastic interfaces. «European journal of mechanics. A, Solids», 10 Octubre 2025, núm. article 105908. 1873-7285 https://hdl.handle.net/2117/443796 10.1016/j.euromechsol.2025.105908 eng https://www.sciencedirect.com/science/article/pii/S0997753825003420 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-126614OB-I00/ES/EVALUACION EXPERIMENTAL Y SIMULACION DEL COMPORTAMIENTO MECANICO A PEQUEÑA ESCALA DE COMPOSITES CERAMICOS/ http://creativecommons.org/licenses/by/4.0/ Open Access Attribution 4.0 International application/pdf Elsevier