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Applying multiaxial fatigue criteria to standing contact fatigue
KTH, Superseded Departments, Solid Mechanics.ORCID iD: 0000-0001-6896-1834
KTH, Superseded Departments, Solid Mechanics.
2001 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 23, no 6, 533-548 p.Article in journal (Refereed) Published
Abstract [en]

The ability of some multiaxial fatigue criteria to predict initiation of standing contact fatigue cracks is investigated. In the standing contact fatigue test an indenter subjects a case-hardened rest specimen to a stationary but pulsating contact load. The initiation of two axi-symmetric crack types appearing in the test specimen is investigated. The surface initiated ring/cone cracks circumscribe the contact area, whereas the lateral cracks are horizontal sub-surface cracks. The effect of the stress-state history at possible crack Locations is evaluated through the Sines, Haigh principal stress, Findley, Me Diarmid and Dang Van multiaxial fatigue criteria. The material fatigue parameters of each criterion are determined from independent bending and torsion fatigue testing. Finally, the mean and spread in radial position of the ring/cone crack are evaluated by considering the statistical effects of a weakest link assumption using a three parameter Weibull distribution. The investigation shows that it is hard to distinguish a single criterion that well describes all aspects of the experimental results. For the current contact situation with highly compressive mean stresses in combination with tensile maximum values the Findley criterion shows the best overall performance followed by the Haigh principal stress criterion

Place, publisher, year, edition, pages
2001. Vol. 23, no 6, 533-548 p.
Keyword [en]
contact fatigue, surface cracks, sub-surface cracks, multiaxial fatigue, weakest link
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-12323DOI: 10.1016/S0142-1123(01)00008-1ISI: 000168646800008OAI: diva2:309659
QC 20100408Available from: 2010-04-08 Created: 2010-04-08 Last updated: 2011-02-11Bibliographically approved
In thesis
1. A study on contact fatigue mechanisms
Open this publication in new window or tab >>A study on contact fatigue mechanisms
2000 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Surfaces subjected to rolling and sliding contacts maysuffer from contact fatigue. This thesisdeals with solidmechanic aspects of contact fatigue including the descriptionand verificationof explaining mechanisms. The new mechanism forsurface initiated contact fatigue is basedon tensile surfacestresses from local asperity contacts. It is also realised thatsub-surfaceinitiated contact fatigue is the result of tensileresidual stresses that emanate from plasticdeformation belowthe surface. These mechanisms clearly show that contact fatiguecracksfollow the same rules as ordinary fatigue cracks inhardened steel.

The thesis contains four papers that treat a new testprocedure named Standing ContactFatigue (SCF). The results ofthe test procedure have played an important role inthedevelopment and verification of the mechanisms for surfaceand sub-surface contact fatigue.

The first part of the research work was experimental. Inthis part the SCF test properties wasdecided, crack resultsconfirmed and crack detection methods developed. Herecomparativestudies were performed using some differentmaterials and mechanical properties. It wasverified that SCFcould detect differences in contact fatigue resistance.

Next a finite element model of the SCF test was evaluatedthrough the general-purposeprogram MARC. The model includedgraded material properties that originate from heattreatment.The residual surface deformation and surface compliance wereverified againstexperimental results. Crack initiation wasinvestigated in two ways. Firstly, the principalstresses atcritical locations were computed and plotted in a Haighdiagram. The diagramshowed that the cracks initiate in adirection perpendicular to the principal stress with thelargeststress range provided that the principal stress is tensilesometime during the load cycle.

Secondly, some high cycle multiaxial fatigue criteria,including the Haigh principal stresscriterion, was evaluatedagainst the SCF crack initiation results. The surface cracklocation waspredicted by including statistical effects using aweakest-link criterion and a three-parameterWeibulldistribution.

The SCF crack propagation was investigated by numericalevaluation ofJ1 andJ2integrals. The crack initiation and propagationphases were separated with a threshold criterionand a directioncriterion. It was found that during crack propagation bothsurface andsub-surface contact fatigue cracks follow thedirection with minimum mode II loading.

Key words: contact fatigue mechanism; spall; spalling;surface crack; sub-surface crack;elasto-plastic indentation;contact compliance measurement; mixed-mode fatigue;fatiguecrack growth;J-integral; multiaxial fatigue; weakest-link.

Place, publisher, year, edition, pages
Stockholm: KTH, 2000. 27 p.
Trita-HFL, ISSN 1104-6813 ; 0271
contact fatigue mechanism, spall, spalling, surface crakc, sub-surface crack, elesto-plastic indentation, contact compliance measurement
National Category
Engineering and Technology
urn:nbn:se:kth:diva-3028 (URN)993-389332-7 (ISBN)
Public defence
2000-11-10, 00:00 (English)
QC 20100407 NR 20140805Available from: 2000-10-26 Created: 2000-10-26 Last updated: 2010-04-28Bibliographically approved

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