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Elastic-plastic characterization of a high strength bainitic roller bearing steel-experiments and modelling
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
2010 (English)In: International Journal of Mechanical Sciences, ISSN 0020-7403, E-ISSN 1879-2162, Vol. 52, no 10, 1254-1268 p.Article in journal (Refereed) Published
Abstract [en]

Monotonic and cyclic deformations were studied for a high strength bainitic roller bearing steel. The temperature of 75 °C corresponded to normal roller bearing conditions. The materials showed hydrostatic influence on yielding, but no or marginal influence of plastic deformation on density change. Therefore, a linear elastic constitutive model with pressure dependent yielding, non-associated flow rule, combined non-linear kinematic and isotropic hardening was necessary to characterize the cyclic behaviour. A stepwise process is detailed for determining the material parameters of the pressure dependent model, where particular attention was placed on the hardening parameters. One set of parameters was sufficient to describe all tested load ranges including compressive ratchetting. Some comparative tests were performed at room temperature, 150 °C and on martensitic specimens at 75 °C. The temperature influence was limited to the isotropic hardening parameters.

Place, publisher, year, edition, pages
2010. Vol. 52, no 10, 1254-1268 p.
Keyword [en]
Cyclic loading, High strength steels, Non-associated flow rule, Plasticity, Strength differential effect, Comparative tests, Cyclic behaviour, Cyclic deformations, Cyclic loadings, Density change, Elastic-Plastic, Hardening parameters, High strength, Isotropic hardenings, Linear elastic, Load range, Material parameter, Non-linear, Pressure dependent, Ratchetting, Roller bearing steel, Room temperature, Strength-differential effects, Temperature influence, Bainite, Bearings (structural), Constitutive models, Cyclic loads, Deformation, Hardening, Roller bearings, Rollers (machine components), High strength steel
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-25967DOI: 10.1016/j.ijmecsci.2010.06.001ISI: 000281275700002Scopus ID: 2-s2.0-77955558210OAI: oai:DiVA.org:kth-25967DiVA: diva2:361196
Note

QC 20150626

Available from: 2010-11-08 Created: 2010-11-08 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Mechanical behaviour of a bainitic high strength roller bearing steel
Open this publication in new window or tab >>Mechanical behaviour of a bainitic high strength roller bearing steel
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 11 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0496
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-25423 (URN)
Presentation
2010-11-19, Room F2, Lindstedtsvägen 26, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

QC 20101110

Available from: 2010-11-10 Created: 2010-10-21 Last updated: 2013-01-15Bibliographically approved
2. Mechanical behaviour of a roller bearing steel: Strength differential effect, low temperature creep and propagation of short cracks
Open this publication in new window or tab >>Mechanical behaviour of a roller bearing steel: Strength differential effect, low temperature creep and propagation of short cracks
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Fatigue cracks in bearings either initiate from the surface or from an inclusion below the rolling contact surface. Then, short cracks start to propagate. Short crack grow at considerably faster rates than long cracks subjected to a nominally equivalent stress intensity factor range. One of the explanations for the difference in growth behaviour between short and long cracks is the development of plastic deformation at the advancing crack tip. In order to investigate this effect, the analysis of short crack propagation at bearing loads requires understanding of the fundamental material behaviour. This thesis presents the material characterisation of a bainitic high strength bearing steel, where the yield stress in tension was lower than in compression. This phenomenon is called strength differential effect (SDE). The work studies the influence of the SDE on the cyclic plastic properties, the elastic behaviour of the material, low temperature creep. These mechanical properties are quantified and modelled using continuum models.

Paper A focused on the characterisation of the SDE which was modelled using a Drucker-Prager yield surface and a non-associated flow rule. The cyclic mechanical properties were quantified and modelled using combined non-linear hardening.

In paper B the elastic behaviour of the material was studied; the material showed non-linear elastic behaviour in uniaxial tension and compression. The elastic modulus was higher in compression than in tension at high stress levels. On the other hand, the cyclic torsion experiments showed that the stress-strain elastic relation in shear was linear. A non-linear elastic model was proposed.

Low temperature creep was studied in Paper C, where the creep strains were quantified in tension and compression. The material showed higher creep strains in tension than in compression for the same stress level and the influence of the SDE in low temperature creep was analysed.

The short crack growth in the bainitic steel was analysed through simulations in Paper D. The material model described in Paper A was implemented in a material subroutine. The simulations captured the development of plastic strains as the short crack becomes long. The material model could qualitatively describe the experiment results, where the change in rate as the crack advanced from short to long was ascribed to the growing plastic zone ahead of the crack tip.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. 37 p.
Series
TRITA-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0573
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-163231 (URN)978-91-7595-493-6 (ISBN)
Public defence
2015-04-21, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20150331

Available from: 2015-03-31 Created: 2015-03-30 Last updated: 2015-03-31Bibliographically approved

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