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A dislocation-based crystal plasticity model for single-crystal micropillars based on strain burst with stochastic characteristics.

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Title: A dislocation-based crystal plasticity model for single-crystal micropillars based on strain burst with stochastic characteristics.
Authors: Guo, Huili1,2 (AUTHOR) guohuili0211@163.com, Xu, Wenjie1 (AUTHOR), Shang, Fulin2 (AUTHOR)
Source: Acta Mechanica. Oct2024, Vol. 235 Issue 10, p5947-5962. 16p.
Subjects: Crystal models, Strains & stresses (Mechanics), Finite element method, Dried beef, Crystals
Abstract: The recent uniaxial micron-compression experiments exhibit the size effect and stochastic phenomenon such as stair-like fluctuation of the strain for the plasticity deformation of the single-crystal micropillars. Nevertheless, the current crystal plasticity theories fail to predict and characterize these phenomena due to lack of consideration of the related physical mechanisms. To compensate for such deficiency, this paper mainly aims to establish a dislocation-based crystal plasticity model for the single-crystal micropillars in the micro-compression to characterize the jerky fluctuation features by considering variational and stochastic micro-boundary conditions, which are controlled the dislocation source length. The new model is applied to investigate the size effect and stair-like fluctuation of the strain for single-crystal Ni with size from 2 to 20 μm by the finite element analysis. The predicted intermittent flows match well with those by experimental observations during the plastic flow. The simulation results reveal that the stress and the amplitude of the strain burst show obvious size effect and stochastic behavior. [ABSTRACT FROM AUTHOR]
Copyright of Acta Mechanica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A dislocation-based crystal plasticity model for single-crystal micropillars based on strain burst with stochastic characteristics.
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  Data: <searchLink fieldCode="AR" term="%22Guo%2C+Huili%22">Guo, Huili</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> guohuili0211@163.com</i><br /><searchLink fieldCode="AR" term="%22Xu%2C+Wenjie%22">Xu, Wenjie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shang%2C+Fulin%22">Shang, Fulin</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Acta+Mechanica%22">Acta Mechanica</searchLink>. Oct2024, Vol. 235 Issue 10, p5947-5962. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Crystal+models%22">Crystal models</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Dried+beef%22">Dried beef</searchLink><br /><searchLink fieldCode="DE" term="%22Crystals%22">Crystals</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The recent uniaxial micron-compression experiments exhibit the size effect and stochastic phenomenon such as stair-like fluctuation of the strain for the plasticity deformation of the single-crystal micropillars. Nevertheless, the current crystal plasticity theories fail to predict and characterize these phenomena due to lack of consideration of the related physical mechanisms. To compensate for such deficiency, this paper mainly aims to establish a dislocation-based crystal plasticity model for the single-crystal micropillars in the micro-compression to characterize the jerky fluctuation features by considering variational and stochastic micro-boundary conditions, which are controlled the dislocation source length. The new model is applied to investigate the size effect and stair-like fluctuation of the strain for single-crystal Ni with size from 2 to 20 μm by the finite element analysis. The predicted intermittent flows match well with those by experimental observations during the plastic flow. The simulation results reveal that the stress and the amplitude of the strain burst show obvious size effect and stochastic behavior. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Acta Mechanica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s00707-024-04022-w
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 5947
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      – SubjectFull: Crystal models
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Finite element method
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      – SubjectFull: Dried beef
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      – SubjectFull: Crystals
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      – TitleFull: A dislocation-based crystal plasticity model for single-crystal micropillars based on strain burst with stochastic characteristics.
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            – D: 01
              M: 10
              Text: Oct2024
              Type: published
              Y: 2024
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