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Fatigue crack initiation in a notched single-crystal superalloy component
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.
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.
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2010 (English)In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 2, no 1, 1067-1075 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, the fatigue crack initiation in notched single-crystal test specimens of material MD2 is investigated and analysed. A critical plane approach is adopted, in which the total strain ranges on the discrete slip planes are evaluated. Furthermore, a Coffin-Manson type of expression is used to describe the number of cycles to fatigue crack initiation. This relation is determined from a set of smooth test specimens loaded uniaxially in the [001], [011] and directions at 500 °C with Rε=−1. The numerical procedure is then applied to a series of experiments, in which notched single-crystal test specimens were exposed to uniaxial cyclic loading in the [001] direction at 500 °C with Rε=0.

Place, publisher, year, edition, pages
Elsevier , 2010. Vol. 2, no 1, 1067-1075 p.
Keyword [en]
Fatigue initiation; Low cycle fatigue; Critical plane approach; Single-crystal superalloy
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-56588DOI: 10.1016/j.proeng.2010.03.115OAI: oai:DiVA.org:liu-56588DiVA: diva2:320528
Available from: 2010-05-25 Created: 2010-05-25 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Modelling of constitutive and fatigue behaviour of a single-crystal nickel-base superalloy
Open this publication in new window or tab >>Modelling of constitutive and fatigue behaviour of a single-crystal nickel-base superalloy
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this licentiate thesis the work done in the project KME410 will be presented. The overall objective of this project is to evaluate and develop tools for designing against fatigue in single-crystal nickel-base superalloys in gas turbines. Experiments have been done on single-crystal nickel-base superalloy specimens in order to investigate the mechanical behaviour of the material. The constitutive behaviour has been modelled and verified by simulations of the experiments. Furthermore, the  microstructural degradation during long-time ageing has been investigated with  respect to the component’s yield limit. The effect has been included in the  constitutive model by lowering the resulting yield limit. Finally, the fatigue crack  initiation of a component has been analysed and modelled by using a critical plane approach.

This thesis is divided into three parts. In the first part the theoretical framework, based upon continuum mechanics, crystal plasticity and the critical plane approach, is derived. This framework is then used in the second part, which consists of three included papers. Finally, in the third part, details are presented of the used  numerical procedures.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2010. 49 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1324
Keyword
Single-crystal nickel-base superalloys, crystal plasticity, tension/compression asymmetry, rafting, fatigue initiation, critical plane approach
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-56288 (URN)LIU{TEK{LIC{2010:7 (Local ID)978-91-7393-384-1 (ISBN)LIU{TEK{LIC{2010:7 (Archive number)LIU{TEK{LIC{2010:7 (OAI)
Presentation
2010-06-17, C3, C-huset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2010-05-25 Created: 2010-05-07 Last updated: 2010-05-25Bibliographically approved
2. 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, SörenJohansson, Sten

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