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Prediction of the fatigue limit: accuracy of post-processing methods
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Several fatigue criteria were evaluated with experimental fatigue test data. The fatigue tests contained many different geometries with different degrees of stress concentration. It was concluded that the differences between the criteria were neglectable when compared to the differences between the specimens. The stress concentrations with the stress gradients and sizes of the highly stresses volumes that resulted were very important. In order to understand this, gradient and volume methods were investigated. The gradient methods showed some improvement over the strictly local evaluation first attempted. The volume method, a weakest link application with a Weibull distribution of the fatigue strength, yielded results useable for actual design situations. The volume method is strongly recommended and the choice of criterion does not seem to be very important.

Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , viii, 8 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0409
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-4061OAI: oai:DiVA.org:kth-4061DiVA: diva2:10596
Presentation
2006-06-02, Sal E2, KTH, Lindstedtsvägen 3, Stockholm, 10:15
Opponent
Supervisors
Note

QC 20101122

Available from: 2006-06-25 Created: 2006-06-25 Last updated: 2013-01-15Bibliographically approved
List of papers
1. Stress based high cycle fatique criteria: a literature survey
Open this publication in new window or tab >>Stress based high cycle fatique criteria: a literature survey
2006 (English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2006
Series
Trita-HFL, ISSN 1104-6813 ; 403
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-6019 (URN)
Note
QC 20101122Available from: 2006-06-25 Created: 2006-06-25 Last updated: 2010-11-22Bibliographically approved
2. A fast, versatile fatigue post-processor and criteria evaluation
Open this publication in new window or tab >>A fast, versatile fatigue post-processor and criteria evaluation
2005 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 27, no 10-12, 1335-1341 p.Article in journal (Refereed) Published
Abstract [en]

This paper is concerned with the development and use of a general High Cycle Fatigue (HCF) post-processor, FAST, Fatigue AnalysiS Tool. It is used to evaluate and develop HCF criteria. FAST can handle many kinds of criteria and evaluate them with fatigue test results from both standard test specimens and actual components. When a reliable criterion exists, FAST will be used for design purposes. The principles of FAST are outlined and an example is given where seven local multiaxial stress based criteria are evaluated, along with the commercial fatigue post-processor Femfat. The conclusion is that a correct treatment of the volume or stress gradient effect is more important than the choice of criterion.

Keyword
high cycle fatigue, multiaxial fatigue, fatigue design, finite elements, fatigue criteria
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-6020 (URN)10.1016/j.ijfatigue.2005.07.011 (DOI)000233487300027 ()2-s2.0-27144444337 (Scopus ID)
Note
QC 20101122Available from: 2006-06-25 Created: 2006-06-25 Last updated: 2010-11-22Bibliographically approved
3. The effect of loaded volume and stress gradient on the fatigue limit
Open this publication in new window or tab >>The effect of loaded volume and stress gradient on the fatigue limit
2007 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 29, no 12, 2259-2272 p.Article in journal (Refereed) Published
Abstract [en]

 In this paper an investigation of multiaxial stress based criteria and evaluation methods is presented. The criteria are used with the point, gradient and volume methods. The purpose is to determine the combination of criteria and methods that is best suited for design against the fatigue limit. The evaluation is based on elastic FE-analysis of 15 geometries for which the fatigue limit loads are known. The point method is based on the maximum values of the fatigue stress in each specimen. With the gradient method, the fatigue stress is adjusted with the relative or absolute gradient of the fatigue stress itself. With the volume method, a statistical size effect is considered, by use of a weakest link integral. Thus, the probability of fatigue depends on the fatigue stress distribution. Also, the gradient and volume methods are combined. The results show that the point and gradient methods are not good for prediction of the fatigue limit. It is recommended to use the volume method in fatigue design. It is accurate enough for prediction of the fatigue limit, straightforward to use and easy to interpret. The choice of method is much more important than the choice of criteria.

Keyword
high cycle fatigue, weakest link, statistical size effect, gradient effect
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-6021 (URN)10.1016/j.ijfatigue.2006.11.011 (DOI)000251461100018 ()2-s2.0-35448996466 (Scopus ID)
Note
QC 20101122Available from: 2006-06-25 Created: 2006-06-25 Last updated: 2010-11-22Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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