20.500.12556/RUL-142638 Elastic and plastic deformation of surface asperities and their load-carrying mechanisms during the formation of a real contact area How the contact behaviours of steel engineering surfaces with different roughnesses (R$_a$ = 0.1, 0.6 and 1.0 µm) are affected by the asperity work-hardening and the deformation regime are described here. Large values of the plasticity index Ψ between 20 and 50 indicate that all the surfaces should undergo a full plastic deformation. However, in the loading range up to the yield stress (on a nominal contact area) the rough surfaces exhibited at least 10 % elastic deformation, while for the smooth surfaces the elastic deformation was as much as 44 %. During the loading, the work-hardening increased the hardness of the rough surfaces by up to 63 %, and that of the smooth surfaces by up to 20 %. However, the asperities were able to carry the load that resulted in as much as a 4–10-times-higher contact pressure than the (initial) bulk yield strength. The proposed contact mechanisms for such an increased asperity-load-carrying capacity depend on the surface roughness. For the rough surfaces this is due to the work-hardening, while for the smooth surfaces the dominant mechanisms enhancing the load-carrying capacity are the work-hardening combined with the hydrostatic bulk stresses. in-situ asperity experiments multi-asperity contacts real contact area work-hardening deformation steel roughness in-situ eksperimenti kontakti več vršičkov realna kontaktna površina utrjevanje deformacija jeklo hrapavost true false true Angleški jezik Slovenski jezik Članek v reviji 2022-11-17 08:23:24 2022-11-17 08:23:25 2025-08-08 13:21:30 0000-00-00 00:00:00 2023 0 0 9 str. pt. A, art. 108067 Vol. 178 Feb. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.92 0301-679X 10.1016/j.triboint.2022.108067 129711619 Kalin_..._-_Elastic_and_plastic_deformation_of_surface_asperities_and_their_load-carrying_mechanisms_during_the_formation_of_a_real_contact_area.pdf Kalin_..._-_Elastic_and_plastic_deformation_of_surface_asperities_and_their_load-carrying_mechanisms_during_the_formation_of_a_real_contact_area.pdf 1 A039A9D747DBE0EB5D61C997D3E709D8 b3d614250b968939fcb88277ea64e56448a09cb11b30a8490ad0a84438cbc289 3ece9b5f-6649-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=164080 https://www.sciencedirect.com/science/article/pii/S0301679X22006387 1 e0caed83-6648-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=164079 Fakulteta za strojništvo Naravoslovnotehniška fakulteta 0 0 0