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Fatigue assessment of welded structures with non-linear boundary conditions
KTH, Superseded Departments, Aeronautical and Vehicle Engineering.
2004 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
2004.
Series
TRITA-AVE, ISSN 1651-7660 ; 2004:50
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-497ISBN: 91-7283-948-1 (print)OAI: oai:DiVA.org:kth-497DiVA: diva2:14227
Available from: 2005-11-22 Created: 2005-11-22 Last updated: 2016-11-24
List of papers
1. FE modelling and fatigue testing of welded construction machinery
Open this publication in new window or tab >>FE modelling and fatigue testing of welded construction machinery
2002 (English)In: Design and analysis of welded high strength steel structuresArticle in journal (Refereed) Accepted
Identifiers
urn:nbn:se:kth:diva-8794 (URN)
Note

QC 20111007

Available from: 2005-11-22 Created: 2005-11-22 Last updated: 2015-07-02Bibliographically approved
2. Fatigue analysis of a welded component based on different methods
Open this publication in new window or tab >>Fatigue analysis of a welded component based on different methods
2004 (English)In: Welding Research Abroad, ISSN 0043-2318, Vol. 50, no 3, 1-11 p.Article in journal (Refereed) Published
Abstract [en]

This study is part of a project regarding the accuracy of life predictions based on finite element analyses and four different fatigue design methods. Different fatigue design codes, such as nominal stress, geometrical stress, notch stress and linear elastic fracture mechanics are compared regarding work effort and analysis accuracy. The paper also describes the process of developing and verifying a finite element (FE) model as well as other practical work such as load data acquisition, static strain measurements and full-scale fatigue tests under spectrum loading. The component that was used was a stay from an articulated hauler, The results from the fatigue tests showed that all cracks started from relatively large root defects and that a large scatter of the weld dimensions can be expected when the welds are manually performed. The comparison between the different fatigue design codes showed a large scatter in the estimated fatigue life. The verification of the FE-model showed some interesting and in some cases unexpected results. The non-linear force-strain behaviour close to the weld toe was not expected and caused a large amount of work with the FE-mode. Since also the manufacturing tolerances were shown to influence the measurements, the verification of the FE-model became quite hard to accomplish. The influence of different parameters such as weld geometry, defects, misalignments, pre-tension forces and installation accuracy of the gauges should be studied further.

National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-8795 (URN)2-s2.0-1842680973 (Scopus ID)
Note

Updated from "Accepted" to "Published". QC 20150702

Available from: 2005-11-22 Created: 2005-11-22 Last updated: 2015-07-02Bibliographically approved
3. Influence of non-linear effects on fatigue assessment of a welded structure
Open this publication in new window or tab >>Influence of non-linear effects on fatigue assessment of a welded structure
2006 (English)In: Steel Research International, ISSN 1611-3683, Vol. 77, no 12, 866-872 p.Article in journal (Refereed) Published
Abstract [en]

In this paper root cracks in a welded structure are investigated using the effective notch stress approach and Linear Elastic Fracture Mechanics (LEFM). The problem is complicated by the fact that the welds subjected to endurance stress are located close to a screw joint. The Finite Element (FE) model used for evaluating the fatigue life includes both this screw joint as well as adjacent components and the contact behaviour between the structures. Several important problems in the evaluation of stress intensity factors and notch stresses are investigated. The results can give useful information in the work of performing a fatigue analysis. The areas examined are the significance of the load direction, mesh density, the importance of the right global stiffness in the model, the crack deflection angle and the modelling of a root notch versus the requirements on the drawing.

Keyword
fatigue, welded structure, weld root, LEFM, notch stress, mesh grid, load direction, model stiffness
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-8796 (URN)000243162500004 ()
Note
QC 20111219 Updated from Accepted to Published Available from: 2005-11-22 Created: 2005-11-22 Last updated: 2011-12-19Bibliographically approved

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Citation style
  • apa
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Output format
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