期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 93, 期 -, 页码 251-268出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2016.05.003
关键词
Transition state theory; Crystal plasticity; Probability and statistics; Polycrystalline material
资金
- U.S. Dept. of Energy, Office of Basic Energy Sciences Project [FWP 06SCPE401]
- Department of Energy's Office of Basic Energy Sciences
- DOE [DE-AC52-06NA25396]
- Division of Scientific User Facilities, Office of Basic Energy Sciences, US Department of Energy [DE-AC05-000R22725]
- UT-Battelle, LLC
A crystal plasticity model is developed whereby explicit connections with transition state theory and with the statistics of dislocation arrangements are simultaneously enforced. Leveraging theoretical work on diffraction line profile analysis, the model predicts the distribution of internal stress (or lattice strain) resulting from that of dislocations arrangements. In turn the internal stress distribution is used to predict the activation rate of dislocation unpinning while providing an explicit connection with experimental diffraction line broadening profiles. The newly developed model is implemented into an elastic viscoplastic self-consistent (EVPSC) framework and applied to the case of stainless steel. To clearly demonstrate the additional predictive capabilities of the model, the latter is used to predict the rate sensitivity, stress and strain relaxation, Bauschinger effect, temperature effects, and evolution of the mean and the standard deviation of the lattice strains. It is found that a single set of parameters provides good agreement between the predictions and the corresponding experiments. (C) 2016 Elsevier Ltd. All rights reserved.
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