A microstructure sensitive criterion for dwell fatigue crack initiation in polycrystalline alloy Ti-6242 is proposed in this paper. Local stress peaks due to load shedding from time dependent plastic deformation fields in neighboring grains are held responsible for crack initiation in dwell fatigue. An accurately calibrated and experimentally validated crystal plasticity finite element (FE) model is employed for predicting slip system level stresses and strains. Vital microstructural features related to the grain morphology and crystallographic orientations are accounted for in the FE model by construction of microstructures that are statistically equivalent to those observed in orientation imaging microscopy scans. The output of the finite element method model is used to evaluate the crack initiation condition in the postprocessing stage. The functional form of the criterion is motivated from the similarities in the stress fields and crack evolution criteria ahead of a crack tip and dislocation pileup. The criterion is calibrated and validated by using experimental data obtained from ultrasonic crack monitoring techniques. It is then used to predict the variation in dwell fatigue lifetime for critical microstructural conditions. The studies are extended to field experiments on forged Ti-6242. Macroscopic aspects of loading are explored for their effect on dwell fatigue life of Ti-6242.
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e-mail: ghosh.5@osu.edu
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April 2009
Research Papers
Grain Level Dwell Fatigue Crack Nucleation Model for Ti Alloys Using Crystal Plasticity Finite Element Analysis
Kedar Kirane,
Kedar Kirane
Graduate Research Associate
Computational Mechanics Research Laboratory, Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210
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Somnath Ghosh,
Somnath Ghosh
Nordholt Professor
Computational Mechanics Research Laboratory, Department of Mechanical Engineering,
e-mail: ghosh.5@osu.edu
The Ohio State University
, Columbus, OH 43210
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Mike Groeber,
Mike Groeber
Graduate Research Associate
Computational Mechanics Research Laboratory, Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210
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Amit Bhattacharjee
Amit Bhattacharjee
Postdoctoral Research Scholar
Computational Mechanics Research Laboratory, Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210
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Kedar Kirane
Graduate Research Associate
Computational Mechanics Research Laboratory, Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210
Somnath Ghosh
Nordholt Professor
Computational Mechanics Research Laboratory, Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210e-mail: ghosh.5@osu.edu
Mike Groeber
Graduate Research Associate
Computational Mechanics Research Laboratory, Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210
Amit Bhattacharjee
Postdoctoral Research Scholar
Computational Mechanics Research Laboratory, Department of Mechanical Engineering,
The Ohio State University
, Columbus, OH 43210J. Eng. Mater. Technol. Apr 2009, 131(2): 021003 (14 pages)
Published Online: March 6, 2009
Article history
Received:
December 31, 2007
Revised:
November 2, 2008
Published:
March 6, 2009
Citation
Kirane, K., Ghosh, S., Groeber, M., and Bhattacharjee, A. (March 6, 2009). "Grain Level Dwell Fatigue Crack Nucleation Model for Ti Alloys Using Crystal Plasticity Finite Element Analysis." ASME. J. Eng. Mater. Technol. April 2009; 131(2): 021003. https://doi.org/10.1115/1.3078309
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