13th International Conference on Fracture June 16–21, 2013, Beijing, China -9- 4 Conclusions Results of this work support the following conclusions: The distributions of FIPs for each element, slip plane cross-section (bands) and the grain volume are very similar with only slight differences in the extreme values. Grain averages of FIP represents better the largest cross section representative of the center of the grain. The extremes values of the FIPs averaged along the slip plane cross-sectional area tend to be located away from the center of the grains. The methodology employed to define grain size effects can affect the variability of the fatigue driving force and modify the distribution of extreme FIP values. Acknowledgements G. M. Castelluccio and D.L. McDowell are deeply grateful for the support provided by Integrated Systems Solutions, Inc. (Technical Monitor: Dr. Nam Phan, NAVAIR). References [1] K. Gall, H. Sehitoglu, and Y. Kadioglu, ‗A Methodology for Predicting Variability in Microstructurally Short Fatigue Crack Growth Rates‘, J. Eng. Mater. Technol., vol. 119, no. 2, pp. 171–179, 1997. [2] V. P. Bennett and D. L. McDowell, ‗Polycrystal orientation distribution effects on microslip in high cycle fatigue‘, Int J. Fatigue, vol. 25, no. 1, pp. 27–39, Jan. 2003. [3] G. Castelluccio, D. L. McDowell, 2013 Effect of annealing twins on crack initiation under high cycle fatigue conditions. J.Mater. Sci., 48, 2376-2387, 2013. [4] G. Castelluccio, D. L. McDowell, ‗Fatigue Life Prediction of Microstructures‘. In Proceedings of the ASME International Mechanical Engineering Congress and Exposition. Houston, Texas, USA: ASME, 2012. [5] B. Lin, L. G. Zhao, J. Tong, and H.-J. Christ, ‗Crystal plasticity modeling of cyclic deformation for a polycrystalline nickel-based superalloy at high temperature,‘ Mater. Sci. Eng., A, 527(15), 3581–3587, 2010. [6] W. Österle, D. Bettge, B. Fedelich, and H. Klingelhöffer, ‗Modelling the orientation and Figure 7. Distributions of the FIPs regularized with the grain size effects for bands, FIPband, (left) and grains, FIPgrain, (right).
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