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An experimental and numerical study on contact fatigue initiation
KTH, Superseded Departments, Solid Mechanics.ORCID iD: 0000-0001-6896-1834
1998 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 1998. , 4 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-792ISBN: 992-623039-3 OAI: oai:DiVA.org:kth-792DiVA: diva2:14772
Presentation
(English)
Note
QC 20100408 NR 20140804Available from: 2000-09-26 Created: 2000-09-26 Last updated: 2010-04-28Bibliographically approved
List of papers
1. Standing Contact Fatigue
Open this publication in new window or tab >>Standing Contact Fatigue
1999 (English)In: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 22, no 3, 225-237 p.Article in journal (Refereed) Published
Abstract [en]

A novel experimental method for testing the resistance of a material to contact fatigue, called standing contact fatigue (SCF), is presented. It comprises a spherical indenter, repeatedly pressed onto a plane specimen in pure normal contact without lubrication, friction or wear. The SCF method is here applied to three case-hardened steels, and results in ring/cone cracks initiated at the surface. The connection between SCF and spalling is discussed.

The experimental results are presented in the form of P-N curves, where P is the normal contact load and N the number of cycles required for fatigue crack initiation. The experimental results are supported by numerical simulations of the tests. The elasto-plastic properties of case-hardened materials are graded, i.e. functions of the depth from the carburized surface. The gradation is estimated from independent experiments and is included in the analysis.

Keyword
contact fatigue, ring cone cracks, elasto-plastic indentation, spalling
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-12306 (URN)000080462900006 ()
Note
QC 20100407Available from: 2010-04-07 Created: 2010-04-07 Last updated: 2017-12-12Bibliographically approved
2. Standing Contact Fatigue Testing of a Ductile Material: Surface and Sub-Surface Cracks
Open this publication in new window or tab >>Standing Contact Fatigue Testing of a Ductile Material: Surface and Sub-Surface Cracks
2000 (English)In: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 23, no 3, 229-240 p.Article in journal (Refereed) Published
Abstract [en]

During standing contact fatigue testing of case hardened steel plates, four different fatigue crack types are found: ring/cone; lateral; radial; and median cracks. Fatigue results are presented as load versus cycle number, with endurance limits and initiation laws for the ring/cone and lateral cracks. The behaviour of the radial surface strain outside the contact is altered by the presence of cracks. In particular this makes in situ crack detection possible for the lateral crack.

The ductility of the tested material is found to be important for fatigue crack initiation. Numerical elastoplastic computations are used to derive the stress cycles responsible for each crack type. Stress cycles at different locations and in different directions are compared in order to explain why a particular crack type initiates. It is noted that cracks are produced normal to principal stresses of sufficient range, which are tensile sometime during the load cycle. Implications for spalling are discussed.

Keyword
contact fatigue, surface crack, subsurface crack, elastoplastic indentation, endurance
National Category
Mechanical Engineering Materials Engineering
Identifiers
urn:nbn:se:kth:diva-12307 (URN)10.1046/j.1460-2695.2000.00269.x (DOI)000087106800005 ()
Note
QC 20100407Available from: 2010-04-07 Created: 2010-04-07 Last updated: 2017-12-12Bibliographically approved

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