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Surface pore initiated fatigue failure in laser clad components
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0002-3569-6795
Tampere University of Technology.
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2013 (English)In: Journal of laser applications, ISSN 1042-346X, E-ISSN 1938-1387, Vol. 25, no 3Article in journal (Refereed) Published
Abstract [en]

A laser clad and machined cylindrical structural steel rod was fatigue tested under four-point bending load. The resulting fracture could be tracked back to a spherical surface pore in the Co-based coating. Due to an oxide inclusion, the pore was not identified by dye penetrant inspection. Two circular buckling strain patterns that were detected beside the pore at the surfaces after fracture confirm local plastic deformation prior to crack initiation. In order to calculate the stress field around the surface pore, linear elastic finite element analysis was carried out. For four-point bending load, a surface pore generally exceeds the maximum stress of a smooth rod as long as the pore is located within an azimuthal angle of ±55°, which was the case for the presented as well as for another pore initiated sample.

Place, publisher, year, edition, pages
2013. Vol. 25, no 3
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-14182DOI: 10.2351/1.4793794ISI: 000322535700005Scopus ID: 2-s2.0-84877256181Local ID: d88f83fc-5fb6-4c08-ae80-50fdfb0fbefdOAI: oai:DiVA.org:ltu-14182DiVA, id: diva2:987136
Note
Validerad; 2013; Bibliografisk uppgift: Article no 032004 ; 20130417 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Alam, Md. MinhajPowell, JohnKaplan, Alexander

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