Elastic and plastic deformation of surface asperities and their load-carrying mechanisms during the formation of a real contact area

Kalin, Mitjan (avtor), Brodnik Žugelj, Blaž (avtor), Lamut, Martin (avtor), Hamouda, Karim (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: in-situ asperity experiments, multi-asperity contacts, real contact area, work-hardening, deformation, steel, roughness
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo ; NTF - Naravoslovnotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2023
• Št. strani: 9 str.
• Številčenje: Vol. 178, pt. A, art. 108067
• PID: 20.500.12556/RUL-142638-8fc5a1ed-3f11-8b76-cd64-979081c288c2
• UDK: 539.92
• ISSN pri članku: 0301-679X
• DOI: 10.1016/j.triboint.2022.108067
• COBISS.SI-ID: 129711619
• Datum objave v RUL: 17.11.2022

Gradivo je del revije

• Naslov: Tribology international
• Skrajšan naslov: Tribol. int.
• Založnik: Butterworth Scientific
• ISSN: 0301-679X
• COBISS.SI-ID: 26558976

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: in-situ eksperimenti, kontakti več vršičkov, realna kontaktna površina, utrjevanje, deformacija, jeklo, hrapavost

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0231
• Naslov: Tribologija