Validation of a phenomenological strain-gradient plasticity theory

Strain-gradient plasticity theories have been developed to account for the size effect in small-scale plasticity in metals. However, they remain of limited use in engineering, for example in standards for nanoindentation, because of their phenomenological nature. In particular, a key parameter, the...

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Bibliographic Details
Published inPhilosophical magazine letters Vol. 96; no. 8; pp. 305 - 312
Main Author Dunstan, D. J.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 02.08.2016
Taylor & Francis Ltd
Subjects
critical thickness theory
Dislocations
Engineering
Fittings
Metals
Nanoindentation
Parameters
Physics
Plasticity
Plasticity of metals
Size effects
Small scale
strain-gradient theory
strained layers
strengthening mechanisms
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Summary:Strain-gradient plasticity theories have been developed to account for the size effect in small-scale plasticity in metals. However, they remain of limited use in engineering, for example in standards for nanoindentation, because of their phenomenological nature. In particular, a key parameter, the characteristic length, can only be determined by fitting to experiment. Here, it is shown that the characteristic length in one such theory derives directly from known quantities through fundamental dislocation physics. This explains and validates the theory for use in engineering.
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ISSN:0950-0839
1362-3036
DOI:10.1080/09500839.2016.1215605