In this paper, the possibility to use linear elastic fracture mechanics (LEFM), with and without a superimposed residual stress field, to predict fatigue crack propagation in the gas turbine disk material Inconel 718 has been studied. A temperature of 400 °C and applied strain ranges corresponding to component near conditions have been considered. A three-dimensional crack propagation software was used for determining the stress intensity factors (SIFs) along the crack path. In the first approach, a linear elastic material behavior was used when analyzing the material response. The second approach extracts the residual stresses from an uncracked model with perfectly plastic material behavior after one loading cycle. As a benchmark, the investigated methods are compared to experimental tests, where the cyclic lifetimes were calculated by an integration of Paris' law. When comparing the results, it can be concluded that the investigated approaches give good results, at least for longer cracks, even though plastic flow was taking place in the specimen. The pure linear elastic simulation overestimates the crack growth for all crack lengths and gives conservative results over all considered crack lengths. Noteworthy with this work is that the 3D-crack propagation could be predicted with the two considered methods in an LEFM context, although plastic flow was present in the specimens during the experiments.
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April 2016
Research-Article
Three-Dimensional LEFM Prediction of Fatigue Crack Propagation in a Gas Turbine Disk Material at Component Near Conditions
Christian Busse,
Christian Busse
Division of Solid Mechanics,
Linköping University,
Linköping 58183, Sweden
e-mail: christian.busse@liu.se
Linköping University,
Linköping 58183, Sweden
e-mail: christian.busse@liu.se
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Johan J. Moverare,
Johan J. Moverare
Division of Engineering Materials,
Linköping University,
Linköping 58183, Sweden
e-mail: johan.moverare@liu.se
Linköping University,
Linköping 58183, Sweden
e-mail: johan.moverare@liu.se
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Kjell Simonsson,
Kjell Simonsson
Division of Solid Mechanics,
Linköping University,
Linköping 58183, Sweden
e-mail: Kjell.simonsson@liu.se
Linköping University,
Linköping 58183, Sweden
e-mail: Kjell.simonsson@liu.se
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Daniel Leidermark
Daniel Leidermark
Division of Solid Mechanics,
Linköping University,
Linköping 58183, Sweden
e-mail: daniel.leidermark@liu.se
Linköping University,
Linköping 58183, Sweden
e-mail: daniel.leidermark@liu.se
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Christian Busse
Division of Solid Mechanics,
Linköping University,
Linköping 58183, Sweden
e-mail: christian.busse@liu.se
Linköping University,
Linköping 58183, Sweden
e-mail: christian.busse@liu.se
David Gustafsson
Patrik Rasmusson
Björn Sjödin
Johan J. Moverare
Division of Engineering Materials,
Linköping University,
Linköping 58183, Sweden
e-mail: johan.moverare@liu.se
Linköping University,
Linköping 58183, Sweden
e-mail: johan.moverare@liu.se
Kjell Simonsson
Division of Solid Mechanics,
Linköping University,
Linköping 58183, Sweden
e-mail: Kjell.simonsson@liu.se
Linköping University,
Linköping 58183, Sweden
e-mail: Kjell.simonsson@liu.se
Daniel Leidermark
Division of Solid Mechanics,
Linköping University,
Linköping 58183, Sweden
e-mail: daniel.leidermark@liu.se
Linköping University,
Linköping 58183, Sweden
e-mail: daniel.leidermark@liu.se
1Corresponding author.
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received April 23, 2015; final manuscript received August 17, 2015; published online October 26, 2015. Assoc. Editor: Herman Shen.
J. Eng. Gas Turbines Power. Apr 2016, 138(4): 042506 (8 pages)
Published Online: October 26, 2015
Article history
Received:
April 23, 2015
Revised:
August 17, 2015
Citation
Busse, C., Gustafsson, D., Rasmusson, P., Sjödin, B., Moverare, J. J., Simonsson, K., and Leidermark, D. (October 26, 2015). "Three-Dimensional LEFM Prediction of Fatigue Crack Propagation in a Gas Turbine Disk Material at Component Near Conditions." ASME. J. Eng. Gas Turbines Power. April 2016; 138(4): 042506. https://doi.org/10.1115/1.4031526
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