Modeling Fatigue Crack Nucleation Using Crystal Plasticity Finite Element Simulations and Multi-time Scaling

2010 ◽  
pp. 497-554 ◽  
Author(s):  
Somnath Ghosh ◽  
Masoud Anahid ◽  
Pritam Chakraborty
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Crystal Plasticity ◽  
Crack Nucleation ◽  
Finite Element Simulations ◽  
Fatigue Crack Nucleation ◽  
Crystal Plasticity Finite Element ◽  
Time Scaling

Grain Level Dwell Fatigue Crack Nucleation Model for Ti Alloys Using Crystal Plasticity Finite Element Analysis

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
Kedar Kirane ◽  
Somnath Ghosh ◽  
Mike Groeber ◽  
Amit Bhattacharjee
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Crystal Plasticity ◽  
Field Experiments ◽  
System Level ◽  
Fe Model ◽  
Fatigue Crack Nucleation ◽  
Crystal Plasticity Finite Element ◽  
Dwell Fatigue

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 β forged Ti-6242. Macroscopic aspects of loading are explored for their effect on dwell fatigue life of Ti-6242.

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