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Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.Barsoum, Zuheir Kungliga tekniska högskolan, KTH.Jonsén, Pär Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0003-0910-7990Häggblad, Hans-Åke Kaplan, Alexander Show others and affiliations 2009 (English)In: 12th NOLAMP proceeding 2009: Nordic Laser Materials Processing Conference ; 24th - 26th August 2009 in Copenhagen / [ed] Erling Dam Mortensen, Kgs. Lyngby: ATV-SEMAPP , 2009Conference paper, Published paper (Refereed)

Abstract [en] : Welded joints are a major component that is often responsible for causing a structure failure or for being the point at which fatigue cracking initiates and propagates. Despite tremendous research efforts, the understanding of fatigue behaviour is still limited, particularly for new techniques like laser hybrid welding. Beside a comprehensive state-of-the-art study, the paper presents a fatigue study of laser hybrid welded eccentric fillet joint of stainless steel of 10 mm thickness, with 5 mm displacement. Motivation is to study the influence of the surface geometry shape on fatigue performance under a four point bending test. 13 samples were produced, measuring the toe radii and testing under constant amplitude loading with stress ratio R=0. Different techniques have been used to measure local weld geometry, like plastic replica, a 3D optical profiler and a 3D-digitizer. The influence of the local weld geometry, like the toe radii, on the stress concentration was studied by FE-analysis. Occasionally lack of fusion was observed, which was taken into account in the FE-analysis. Based on the nominal stress approach, SN-curves were designed for laser hybrid welded eccentric fillet joints. Macro hardness tests were carried out and the crack surfaces were observed in order to detect crack initiation and propagation. Correlations between the toe radii, the corresponding stress maxima and crack initiation locations were studied between the different samples and even along the welds.

Place, publisher, year, edition, pages: Kgs. Lyngby: ATV-SEMAPP , 2009.

Research subject: Manufacturing Systems Engineering; Solid Mechanics

Identifiers: URN: urn:nbn:se:ltu:diva-34217Local ID: 85a913e0-a692-11de-8293-000ea68e967bOAI: oai:DiVA.org:ltu-34217DiVA: diva2:1007467

Conference: Nordic Conference on Laser Processing of Materials : 24/08/2009 - 26/08/2009

Note: Godkänd; 2009; Bibliografisk uppgift: CD-ROM; 20090921 (minala)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-01-19Bibliographically approved



Autor: Alam, Md. Minhaj

Fuente: http://ltu.diva-portal.org/







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