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A parametric investigation of surface initiated rolling contact fatigue using the asperity point load mechanism
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0001-6896-1834
2014 (English)In: Advances in Fracture and Damage Mechanics XII: selected, peer reviewed papers from the 12th International Conference on Fracture and Damage Mechanics (FDM 2013), September 17-19, 2013, Sardinia, Italy, Trans Tech Publications Inc., 2014, 45-48 p.Conference paper (Refereed)
Abstract [en]

Rolling contact fatigue (RCF) will eventually become an issue for machine elements that are repeatedly over-rolled with high contact loads and small relative sliding motion. The damage consists of cracks and craters in the contact surfaces. Asperities on the contact surfaces act as local stress raisers and provide tensile surface stresses which can explain both initiation and propagation of surface initiated RCF damage. A parametric study was performed to investigate the contribution of surface roughness, friction and a residual surface stress to the RCF damage process. The effects on initiation, crack path and fatigue life at both early and developed damage were examined for a gear application. Both a one-parameter-at-a-time approach and a 2-level full factorial design were carried out. Surface roughness and local friction properties were found to control crack initiation, whereas the simulated crack path was primarily affected by the residual surface stress, especially for developed damage. Reduced surface roughness, improved lubrication and a compressive residual surface stress all contributed to increase the simulated fatigue life. The asperity point load model could predict effects on RCF that are observed with experiments. The results further support the asperity point load mechanism as the source behind surface initiated RCF.

Place, publisher, year, edition, pages
Trans Tech Publications Inc., 2014. 45-48 p.
, Key Engineering Materials, ISSN 1013-9826 ; 577-578
Keyword [en]
Asperity, Crack path, Fatigue life, Friction, Initiation, Rolling contact fatigue
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-145496DOI: 10.4028/ 000336693900012ScopusID: 2-s2.0-84888624220ISBN: 978-303785830-1OAI: diva2:718556
12th International Conference on Fracture and Damage Mechanics, FDM 2013; Sardinia; Italy; 17 September 2013 through 19 September 2013

QC 20140521

Available from: 2014-05-21 Created: 2014-05-21 Last updated: 2014-06-27Bibliographically approved

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