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The influence of surface geometry and topography on the fatigue cracking behaviour of laser hybrid welded eccentric fillet joints
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0003-4180-4710
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2010 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 256, no 6, 1936-1945 p.Article in journal (Refereed) Published
Abstract [en]

Laser hybrid welding of an eccentric fillet joint causes a complex geometry for fatigue load by 4-point bending. The weld surface geometry and topography were measured and studied in order to understand the crack initiation mechanisms. The crack initiation location and the crack propagation path were studied and compared to Finite Element stress analysis, taking into account the surface macro-and micro-geometry. It can be explained why the root and the upper weld toe are uncritical for cracking. The cracks that initiate from the weld bead show higher fatigue strength than the samples failing at the lower weld toe, as can be explained by a critical radius for the toe below which surface ripples instead determine the main stress raiser location for cracking. The location of maximum surface stress is related to a combination of throat depth, toe radius and sharp surface ripples along which the cracks preferably propagate.

Place, publisher, year, edition, pages
2010. Vol. 256, no 6, 1936-1945 p.
Keyword [en]
Surface geometry, Surface ripples, Topography, Crack, Fatigue, Hybrid weld
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-29088DOI: 10.1016/j.apsusc.2009.10.041ISI: 000273151900056ScopusID: 2-s2.0-72549104059OAI: diva2:391641
QC 20110125Available from: 2011-01-25 Created: 2011-01-25 Last updated: 2011-01-25Bibliographically approved

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Barsoum, Zuheir
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