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

  • Somnath Ghosh
  • Masoud Anahid
  • Pritam Chakraborty
Chapter

Abstract

This chapter addresses two important aspects of predicting fatigue crack nucleation in polycrystalline alloys under dwell cyclic loading. The first is a microstructure sensitive criterion for dwell fatigue crack initiation in polycrystalline titanium alloys. Local stress peaks due to load shedding from time-dependent plastic deformation fields in neighboring grains are responsible for crack initiation. Crystal plasticity finite element simulation results are post-processed to provide inputs to the fatigue crack nucleation model. The second part of this chapter discusses a wavelet transformation based multi-time scaling (WATMUS) algorithm for accelerated crystal plasticity finite element simulations. The WATMUS algorithm does not require any scale-separation and naturally transforms the coarse time scale response into a “monotonic cycle scale” without the requirement of subcycle resolution. The method significantly enhances the computational efficiency in comparison with conventional single timescale integration methods. Adaptivity conditions are also developed for this algorithm to improve accuracy and efficiency.

Keywords

Slip System Wavelet Coefficient Crack Nucleation Coarse Scale Crystal Plasticity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This work has been supported by the US National Science Foundation (Grant # CMMI-0800587, Program Manager: Dr. Clark Cooper), Federal Aviation Administration (Grant # DTFA03-01-C-0019, Program Manager: Dr. Joe Wilson), the Air Force Office of Scientific Research (Grant # FA9550-05-1-0067, Program Manager: Dr. David Stargel) and the Office of Naval Research (Grant # N00014-05-1-0504, Program Manager: Dr. Julie Christodolou). This sponsorship is gratefully acknowledged. Computer support by the Ohio Supercomputer Center through grant PAS813-2 is also gratefully acknowledged.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Somnath Ghosh
    • 1
  • Masoud Anahid
  • Pritam Chakraborty
  1. 1.Department of Mechanical Engineering, W496 Scott LaboratoryThe Ohio State UniversityColumbusUSA

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