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Large scale yielding fatigue crack growth: A literature survey
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2007 (English)Report (Other academic)
Abstract [en]

In this literature survey report an overview of different issues connected to fatigue crack growth under large scale yielding is given. Nonlinear measures as the J-integral and the Crack Tip Opening Displacement (CTOD) are reviewed and the requirements for path independence of the J-integral are highlighted. The extension of the measures to the fatigue situation, i.e. ΔJ and ΔCTOD are also reviewed from a theoretical as well as an experimental point of view.

Crack closure is an important issue to consider when conducting fatigue life assessments. The development of the crack closure behaviour under constant amplitude loading under both small scale and large scale yielding is reviewed. Crack closure under variable amplitude loading and large scale yielding becomes very complex and is only discussed briefly.

It was found that the operational definition of ΔJ, i.e. ΔJD (where index D designates an J-value based on the load deformation path of the actual geometry) and also the ΔCTOD are able to correlate the fatigue crack growth under both small scale yielding and large scale yielding. The most common measure used as correlating parameter is ΔJD. However, the main issue today is the lack of an simple engineering method based either on ΔJ or ΔCTOD.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2007. , 108 p.
Trita-HFL. Report / Royal Institute of Technology, Solid mechanics, ISSN 1654-1472 ; 0438
Keyword [en]
Fracture mechanics, fatigue crack growth, large scale yielding, small scale yielding, crack closure, potential drop, crack tip opening displacement, low cycle fatigue
National Category
Applied Mechanics Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-109771OAI: diva2:585812
Variable amplitude fatigue crack growth in the low cycle regime

QC 20130111

Available from: 2013-01-11 Created: 2013-01-08 Last updated: 2013-01-11Bibliographically approved

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