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Standing contact fatigue with a cylindrical indenter
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
2005 (English)In: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 28, no 7, 599-613 p.Article in journal (Refereed) Published
Abstract [en]

A hardened steel cylinder was repeatedly pressed against a flat case-hardened steel specimen that was equally wide as the cylinder was long. Some contact end effects were noted as a result of limited plastic deformation. A strain gauge on the contact surface, just outside the contact and oriented perpendicular to the cylinder detected a surface strain when the cylinder was loaded. The non-zero surface strain was the result of boundary effects of the finite specimen. Four different types of contact fatigue cracks developed in and below the specimen contact surface. The cracks were named lateral, median, contact end and edge cracks. Changes in the measured surface strain values could be used to determine when the lateral and edge cracks developed. The order in which all four crack types typically developed was determined from optical crack observation at test termination, strain measurements and stress computations. Numerical computations using finite-element (FE) analyses were used to verify the surface strain behaviour due to loading and cracking, to verify contact end effects; crack locations and crack orientation by aid of the Findley multi-axial fatigue criterion.

Place, publisher, year, edition, pages
2005. Vol. 28, no 7, 599-613 p.
Keyword [en]
contact fatigue, lateral crack, spalling, sub-surface cracks
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-7769DOI: 10.1111/j.1460-2695.2005.00904.xISI: 000229934300003Scopus ID: 2-s2.0-21344454861OAI: oai:DiVA.org:kth-7769DiVA: diva2:12894
Note
QC 20100702Available from: 2007-12-10 Created: 2007-12-10 Last updated: 2011-11-11Bibliographically approved
In thesis
1. On the asperity point load mechanism for rolling contact fatigue
Open this publication in new window or tab >>On the asperity point load mechanism for rolling contact fatigue
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Rolling contact fatigue is a damage process that may arise in mechanical applications with repeated rolling contacts. Some examples are: gears; cams; bearings; rail/wheel contacts. The resulting damage is often visible with the naked eye as millimeter sized surface craters. The surface craters are here denoted spalls and the gear contact served as a case study.

The work focused on the asperity point load mechanism for initiation of spalls. It was found that the stresses at asperity level may be large enough to initiate surface cracking, especially if the complete stress cycle was accounted for.

The gear contact is often treated as a cylindrical contact. The thesis contains experimental and numerical results connected to rolling contact fatigue of cylindrical contacts. At the outset a stationary cylindrical contact was studied experimentally. The stationary test procedure was used instead of a rolling contact. In this way the number of contact parameters was minimized. The cylindrical contact resulted in four different contact fatigue cracks. The two cracks that appeared first initiated below the contact. The other two cracks developed at the contact surface when the number of load cycles and the contact load increased.

The influence of a surface irregularity (asperity) was studied numerically with the Finite Element Method (FEM). Firstly, the stationary contact was modelled and investigated numerically. At the cylindrical contact boundary a single axisymmetric was included. The partially loaded asperity introduced a tensile surface stress, which seen from the asperity centre was radially directed. Secondly, FE simulations were performed where a single axisymmetric asperity was over-rolled by a cylindrical contact. The simulations were performed for pure rolling and rolling with slip. For both situations, tensile forward directed stresses in front of the asperity were found. The presence of slip and a surface traction greatly increased the stresses in front of the asperity. Finally, when rolling started from rest with applied slip, the distance to steady-state rolling was determined for elastic similar cylindrical rollers.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 14 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid mechanics, ISSN 1654-1472 ; 0440
Keyword
Rolling contact fatigue, Spalling, Asperity contact, Point load; Micro-cracks, Traction, Applied slip
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-4569 (URN)
Public defence
2007-12-17, F3, Lindstedsvägen 26, Stockholm, KTH, 10:15
Opponent
Supervisors
Note

QC 20100702

Available from: 2007-12-10 Created: 2007-12-10 Last updated: 2013-01-14Bibliographically approved
2. A numerical and experimental investifgation on surface and sub-surface initiation of contact fatigue cracks at cylindrical contacts
Open this publication in new window or tab >>A numerical and experimental investifgation on surface and sub-surface initiation of contact fatigue cracks at cylindrical contacts
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 13 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 95
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-3887 (URN)
Presentation
2006-03-07, Sal D3, Lindstedsvägen 5, Stockholm, 10:15
Opponent
Supervisors
Note

QC 20101111

Available from: 2006-03-15 Created: 2006-03-15 Last updated: 2013-01-15Bibliographically approved

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