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Fatigue assessment of cut edges in high strength steel – Influence of surface quality
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. HIAB AB, Research and Development Loader Cranes, Sweden.ORCID iD: 0000-0002-2847-1555
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2017 (English)In: Materialwissenschaft und Werkstofftechnik, ISSN 0933-5137, E-ISSN 1521-4052, Vol. 48, no 6, 556-569 p.Article in journal (Refereed) Published
Abstract [en]

The influence of surface roughness on the fatigue strength in high strength steels and different cutting processes are studied. Fatigue testing is conducted on S700 and S960 material for different plate thicknesses cut in dog bone specimens using oxygen, plasma, laser and waterjet cutting. The surface roughness is measured for all specimens and residual stress measurements are carried out. Estimations of the fatigue strength are made based on the measured surface roughness and the ISO 9013:2002 standard for thermal cutting quality tolerances. The testing shows a 15–70 % increase in the fatigue strength compared to the estimation, proving a weak connection between the surface quality levels in ISO 9013:2002 and the fatigue test results. Different codes and design recommendations (IIW, EC3 and EN 13001) for fatigue strength of cut surfaces are compared with the fatigue test results which clearly shows an increased fatigue strength with enhanced quality and steel grades. However, the codes and design recommendations do not allow for any fatigue strength improvement with improved quality and increased yield strength.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2017. Vol. 48, no 6, 556-569 p.
Keyword [en]
cut edges, fatigue assessment, High strength steels, quality, surface roughness, thermal cutting, welded structures
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-210603DOI: 10.1002/mawe.201600707Scopus ID: 2-s2.0-85020910694OAI: oai:DiVA.org:kth-210603DiVA: diva2:1118911
Note

QC 20170703

Available from: 2017-07-03 Created: 2017-07-03 Last updated: 2017-07-03Bibliographically approved

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CiteExportLink to record
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