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Fatigue Analysis of a Welded Aluminium Joint
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this project, the fatigue behaviour of aluminium (AL 5083 H111) gusset and flange joined with a fillet weld, is investigated through experiments and numerical methods. The work aims at improved knowledge on fatigue in an aluminium welded joint subjected to constant amplitude varying load.

 

The results of the experiments are investigated with the Basquin equation. The mean curve is estimated by the maximum likelihood estimation (MLE) by using both the failed specimen data and the run-out data. From the mean curve, a component specific design curve is estimated. Comparison of the component specific design curve with the recommendation’s design curve highlighted the inherent conservatism of the recommendation’s design curve.

 

Nominal, hot-spot and equivalent notch methods were evaluated, and a comparative study was performed. The numerical investigation showed that the predicted fatigue life increased with model complexity. Comparison to the experimentally derived component specific design curve highlighted non-conservatism of the numerically predicted fatigue life for large stress ranges. The degree of conservatism of the numerical methods is however strongly affected by the slope of the considered design curve.

Place, publisher, year, edition, pages
2019. , p. 76
Series
TRITA-SCI-GRU ; 2019:338
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-259991OAI: oai:DiVA.org:kth-259991DiVA, id: diva2:1354140
Subject / course
Solid Mechanics
Supervisors
Examiners
Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2019-09-24Bibliographically approved

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