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The influence of surface geometry and topography on the fatigue cracking behaviour of laser hybrid welded eccentric fillet joints
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.ORCID-id: 0000-0003-4180-4710
Vise andre og tillknytning
2010 (engelsk)Inngår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 256, nr 6, s. 1936-1945Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2010. Vol. 256, nr 6, s. 1936-1945
Emneord [en]
Surface geometry, Surface ripples, Topography, Crack, Fatigue, Hybrid weld
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-29088DOI: 10.1016/j.apsusc.2009.10.041ISI: 000273151900056Scopus ID: 2-s2.0-72549104059OAI: oai:DiVA.org:kth-29088DiVA, id: diva2:391641
Merknad
QC 20110125Tilgjengelig fra: 2011-01-25 Laget: 2011-01-25 Sist oppdatert: 2017-12-11bibliografisk kontrollert

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