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Multi-axial fatigue initiation at inclusions and subsequent crack growth in a bainitic high strength roller bearing steel at uniaxial experiments
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0001-6896-1834
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0001-7674-8582
2012 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 41, 130-139 p.Article in journal (Refereed) Published
Abstract [en]

The behaviour of inclusion initiated fatigue was studied for a high strength bearing steel with a bainite micro-structure. The analysis included experiments and numerical simulations. It was realized that the stress-state was multi-axial in the matrix material that met the inclusion also for a uniaxial far field stress. Fatigue initiation risk at the interface between the inclusion and matrix material was therefore predicted with the Findley multi-axial critical plane criterion. The fatigue parameters were determined from independent experiments on smooth specimens with tensile surface stress gradients. Crack growth from the inclusion to final rupture was modelled as a penny shaped crack with closure compensated effective material parameters. The growth simulations suggested that the majority of the fatigue life was consumed as fatigue crack initiation at the non-metallic inclusion.

Place, publisher, year, edition, pages
2012. Vol. 41, 130-139 p.
Keyword [en]
Bainite, Fatigue crack growth, Fatigue initiation, High strength steel, Inclusions, Bearing steels, Critical planes, Far-field stress, Fatigue crack initiation, Fatigue parameter, Growth simulation, High strength, Material parameter, Matrix materials, Multi-axial fatigue, Non-metallic inclusions, Penny-shaped crack, Roller bearing steel, Tensile surface stress, Crack closure, Experiments, Fatigue crack propagation, Fatigue of materials, Interfaces (materials)
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-95726DOI: 10.1016/j.ijfatigue.2011.11.006ISI: 000303486800018ScopusID: 2-s2.0-84859419342OAI: diva2:529063

QC 20120529

Available from: 2012-05-29 Created: 2012-05-29 Last updated: 2013-10-01Bibliographically approved

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Alfredsson, BoOlsson, Erik
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