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A combined critical plane and critical distance approach for predicting fatigue crack initiation in notched single-crystal superalloy components
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology. Siemens Industrial Turbomachinery AB, Finspång, Sweden.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
2011 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 33, no 10, 1351-1359 p.Article in journal (Refereed) Published
Abstract [en]

The fatigue crack initiation in notched single-crystal components of material MD2 is investigated and analysed. A critical plane approach in combination with a critical distance method has been adopted, in which the total shear strain ranges on the discrete crystallographic slip planes are evaluated. To determine the critical distance two approaches were evaluated, a mean value approach and a cycle dependent approach. Furthermore, a Coffin-Manson type of expression (derived from the results of a set of 12 smooth specimens) is used to predict the number of cycles to fatigue crack initiation. The numerical procedure is applied to a series of experiments, in which notched single-crystal components were exposed to uniaxial cyclic loading in the nominal [001] crystal direction at 500 degrees C with R(epsilon) = 0. A good correlation between the experimental results and the simulated results was found.

Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 33, no 10, 1351-1359 p.
Keyword [en]
Single-crystal superalloy; Fatigue crack initiation; Critical plane approach; Notch correction; Critical distance theory
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-69763DOI: 10.1016/j.ijfatigue.2011.05.009ISI: 000292795100002OAI: oai:DiVA.org:liu-69763DiVA: diva2:433634
Available from: 2011-08-10 Created: 2011-08-08 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Crystal plasticity and crack initiation in a single-crystal nickel-base superalloy: Modelling, evaluation and appliations
Open this publication in new window or tab >>Crystal plasticity and crack initiation in a single-crystal nickel-base superalloy: Modelling, evaluation and appliations
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this dissertation the work done in the projects KME-410/502 will be presented.The overall objective in these projects is to evaluate and develop tools for designingagainst fatigue in single-crystal nickel-base superalloys in gas turbines. Experimentshave been done on single-crystal nickel-base superalloy specimens in order toinvestigate the mechanical and fatigue behaviour of the material. The constitutivebehaviour has been modelled and veried by FE-simulations of the experiments.Furthermore, the microstructural degradation during long-time ageing has been investigatedwith respect to the material's yield limit. The eect has been includedin the constitutive model by lowering the resulting yield limit. Moreover, the fatiguecrack initiation of a component has been analysed and modelled by using acritical plane approach in combination with a critical distance method. Finally, asan application, the derived single-crystal model was applied to all the individualgrains in a coarse grained specimen to predict the dispersion in fatigue crack initiationlife depending on random grain distributions.

This thesis is divided into three parts. In the rst part the theoretical framework,based upon continuum mechanics, crystal plasticity, the critical plane approachand the critical distance method, is derived. This framework is then used in thesecond part, which consists of six included papers. Finally, in the third part, detailsof the used numerical procedures are presented.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 59 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1410
Keyword
Single-crystal superalloy, Crystal plasticity, Fatigue crack initiation, Critical plane model, Theory of critical distance, Rafting, Tension/compression asymmetry
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-72093 (URN)978-91-7393-022-2 (ISBN)
Public defence
2011-12-16, C3, Hus C, Campus Valla, Linköpings universitet, Linköping, 10:15 (Swedish)
Opponent
Supervisors
Available from: 2011-11-16 Created: 2011-11-16 Last updated: 2011-12-05Bibliographically approved

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Leidermark, DanielMoverare, JohanSimonsson, KjellSjöström, Sören

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