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Numerical analysis of plasticity effects on fatigue growth of a short crack in a bainitic high strength bearing steel
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2016 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 92, 36-51 p.Article in journal (Refereed) Published
Abstract [en]

Plasticity effects on fatigue growth were simulated for a physically short crack. The material description comprised the Drucker-Prager yield surface, non-associated flow rule and non-linear combined hardening. The simulated development of the growth limiting parameter agreed with the experimental crack behaviour with early rapid propagation followed by a transition to slow R-controlled growth. The crack was open to the tip without any crack face closure throughout all load cycles. Instead compressive residual stresses developed at the unloaded tip which supplied an explanation to the slow rate of the propagated short crack in this bainitic high strength bearing steel. The material's strength differential effect was the key difference explaining why compressive residual stresses instead of crack face closure was responsible for the short crack effect in this material.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 92, 36-51 p.
Keyword [en]
Crack simulation, Short crack, Closure effects, Crack propagation, Strength differential effect
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-193971DOI: 10.1016/j.ijfatigue.2016.06.030ISI: 000383930200005ScopusID: 2-s2.0-84978049974OAI: diva2:1037689

QC 20161017

Available from: 2016-10-17 Created: 2016-10-14 Last updated: 2016-10-17Bibliographically approved

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Alfredsson, BoLinares Arregui, IreneHazar, Selcuk
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