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Comparison of local stress based concepts - Effects of low-and high cycle fatigue and weld quality
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures. Khalifa University of Science, Technology and Research (KUSTAR), Department of Aerospace Engineering, P.O.Box: 127788, Abu Dhabi, United Arab Emirates.ORCID iD: 0000-0003-4465-9299
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures. Khalifa University of Science, Technology and Research (KUSTAR), Department of Aerospace Engineering, P.O.Box: 127788, Abu Dhabi, United Arab Emirates.ORCID iD: 0000-0003-4180-4710
2015 (English)In: Engineering Failure Analysis, ISSN 1350-6307, E-ISSN 1873-1961, Vol. 57, 323-333 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents a study of the ability for two stress based methods, the effective notch stress method and the structural stress approach, to estimate the fatigue life in the low cycle and the high cycle fatigue regime, considering the weld quality. Two different non-load carrying joint configurations were considered, cruciform joint and T-joint. The conducted fatigue analysis shows that both methods are capable to estimate the fatigue life with good accuracy within the low cycle and the high cycle regime. The effective notch stress generally shows a smaller scatter, it also considers increased weld quality with good accuracy, in contrast to the structural stress approach.

Place, publisher, year, edition, pages
Pergamon Press, 2015. Vol. 57, 323-333 p.
Keyword [en]
Fatigue assessment, Structural stress, Effective notch stress, Welded structures
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-174583DOI: 10.1016/j.engfailanal.2015.07.022ISI: 000361833000026Scopus ID: 2-s2.0-84939632528OAI: oai:DiVA.org:kth-174583DiVA: diva2:877598
Funder
VINNOVA, 2011-03620
Note

QC 20151207

Available from: 2015-12-07 Created: 2015-10-07 Last updated: 2017-12-01Bibliographically approved
In thesis
1. Fatigue properties of cut and welded high strength steels: Quality aspects in design and production
Open this publication in new window or tab >>Fatigue properties of cut and welded high strength steels: Quality aspects in design and production
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This doctoral thesis concerns fatigue of welded structures. Welding is one of the world’s most common joining methods and it is frequently used in several structural applications in many fields. Some examples are construction vehicles, loader cranes, trucks, busses, forestry and agricultural machines, bridges and ships. Since these structures are subjected to repeated loading, fatigue is the most common cause of failure.

A novel numerical algorithm has been developed which assesses the welded surface and calculates and quantifies weld quality parameters and the presence of defects which are critical in fatigue applications. The algorithm is designed for implementation in serial production. It will provide robust and reliable feedback on the quality being produced, which is essential if high strength steels are utilized.

Two welding procedures which can increase the weld quality in as welded conditions have been assessed. These procedures utilize welding in different positions and pendling techniques, which can be accomplished using the existing welding equipment. It was found that by using these methods, the fatigue strength can be increased compared to normal weld quality.

Furthermore, two fatigue assessment methods ability to account for increased weld quality in low cycle and high cycle fatigue applications has been studied. One of these methods showed sufficient accuracy in predicting the fatigue strength with small scatter and also account for increased weld quality.

When implementing thinner high strength steels, the overall stress level in the structure increase. Therefore, other locations such as the steel cut edges may become critical for fatigue failure unless they are not designed and manufactured with the same quality as the welded joint. The influence of surface quality on cut edges was studied and the fatigue strength was estimated using international standards and a fatigue strength model for cut edges.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 56 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:21
Keyword
Welding, Fatigue assessment, Cutting, Weld quality, Fatigue design, Fracture Mechanics
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-188225 (URN)978-91-7729-027-8 (ISBN)
Public defence
2016-08-26, F3, Lindstedtsvägen 26, Stockholm, 09:00 (English)
Opponent
Supervisors
Projects
WIQLIGHTSTRUCTONWELD
Funder
VINNOVA
Note

QC 20160613

Available from: 2016-06-13 Created: 2016-06-09 Last updated: 2016-06-13Bibliographically approved

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Stenberg, ThomasBarsoum, Zuheir

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