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  Origin of the sensitivity in modeling the glide behaviour of dislocations

Pei, Z., & Stocks, G. M. (2018). Origin of the sensitivity in modeling the glide behaviour of dislocations. International Journal of Plasticity, 106, 48-56. doi:10.1016/j.ijplas.2018.02.017.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E5B2-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E5B3-2
Genre: Journal Article

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 Creators:
Pei, Zongrui1, 2, Author              
Stocks, G. Malcolm3, Author              
Affiliations:
1Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA, persistent22              
2Ab Initio Thermodynamics, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863338              
3Oak Ridge National Laboratory, TN37831, USA, persistent22              

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Free keywords: Mechanical engineering; Models; Plasticity, Analytic formula; Convergence test; Dislocation mobility; Empirical parameters; Input parameter; Peierls-Nabarro model; Sensitivity; Standing problems, Single crystals
 Abstract: 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. © 2018 Elsevier Ltd.

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Language(s): eng - English
 Dates: 2018-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.ijplas.2018.02.017
BibTex Citekey: Pei201848
 Degree: -

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Title: International Journal of Plasticity
  Abbreviation : Int. J. Plast.
Source Genre: Journal
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Publ. Info: New York : Pergamon
Pages: - Volume / Issue: 106 Sequence Number: - Start / End Page: 48 - 56 Identifier: ISSN: 0749-6419
CoNE: https://pure.mpg.de/cone/journals/resource/954925544230