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Title: Origin of the sensitivity in modeling the glide behaviour of dislocations

The sensitivity in predicting glide behaviour of dislocations has been a long-standing problem in the framework of the Peierls-Nabarro model. The predictions of both the model itself and the analytic formulas based on it are too sensitive to the input parameters. In order to reveal the origin of this important problem in materials science, a new empirical-parameter-free formulation is proposed in the same framework. Unlike previous formulations, it includes only a limited small set of parameters all of which can be determined by convergence tests. Under special conditions the new formulation is reduced to its classic counterpart. In the light of this formulation, new relationships between Peierls stresses and the input parameters are identified, where the sensitivity is greatly reduced or even removed.
Authors:
ORCiD logo [1] ; ORCiD logo [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Max-Planck-Inst. fur Eisenforschung GmbH, Dusseldorf (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
International Journal of Plasticity
Additional Journal Information:
Journal Name: International Journal of Plasticity; Journal ID: ISSN 0749-6419
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1435253

Pei, Zongrui, and Stocks, George Malcolm. Origin of the sensitivity in modeling the glide behaviour of dislocations. United States: N. p., Web. doi:10.1016/j.ijplas.2018.02.017.
Pei, Zongrui, & Stocks, George Malcolm. Origin of the sensitivity in modeling the glide behaviour of dislocations. United States. doi:10.1016/j.ijplas.2018.02.017.
Pei, Zongrui, and Stocks, George Malcolm. 2018. "Origin of the sensitivity in modeling the glide behaviour of dislocations". United States. doi:10.1016/j.ijplas.2018.02.017.
@article{osti_1435253,
title = {Origin of the sensitivity in modeling the glide behaviour of dislocations},
author = {Pei, Zongrui and Stocks, George Malcolm},
abstractNote = {The sensitivity in predicting glide behaviour of dislocations has been a long-standing problem in the framework of the Peierls-Nabarro model. The predictions of both the model itself and the analytic formulas based on it are too sensitive to the input parameters. In order to reveal the origin of this important problem in materials science, a new empirical-parameter-free formulation is proposed in the same framework. Unlike previous formulations, it includes only a limited small set of parameters all of which can be determined by convergence tests. Under special conditions the new formulation is reduced to its classic counterpart. In the light of this formulation, new relationships between Peierls stresses and the input parameters are identified, where the sensitivity is greatly reduced or even removed.},
doi = {10.1016/j.ijplas.2018.02.017},
journal = {International Journal of Plasticity},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {3}
}