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Failure analysis of martensitic stainless steel bridge roller bearings
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. (Stålbyggnad)
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
2017 (English)In: Engineering Failure Analysis, ISSN 1350-6307, E-ISSN 1873-1961, Vol. 79Article in journal (Refereed) Published
Abstract [en]

The paper is aimed at finding the likely failure mechanism of a bridge roller bearing made of high strength martensitic stainless steel. Spectroscopy and finite element stress analysis of the roller indicated that an initial radial surface crack, found at an end face of the roller and close to the contact region, was induced by stress corrosion cracking (SCC). The initial crack subsequently changed shape and increased in size under growth through fatigue and finally formed a quarter-circle radial crack centred on the end face corner of the roller. Numerically computed stress intensity factors for the final crack showed that crack loading was predominantly in Mode II. For a crack size as observed on the fracture surface, the maximum service load, as specified by the manufacturer, enhanced by a certain roller bearing misalignment effect, was sufficient for failure through fracture.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 79
Keyword [en]
Brittle fracture; Failure analysis; Finite element analysis; Stress intensity factors
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-64139DOI: 10.1016/j.engfailanal.2017.06.035OAI: oai:DiVA.org:ltu-64139DiVA: diva2:1111137
Available from: 2017-06-17 Created: 2017-06-17 Last updated: 2017-06-21

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