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Application of the slip circle construction to a spherical indenter

Application of the slip circle construction to a spherical indenter
Application of the slip circle construction to a spherical indenter
Precise prediction of plastic flow patterns during indentation is difficult, due to the presence of many possible slip systems and the complexity of dislocation interactions. However, some general patterns of behaviour are observed, in particular a transition from laminar flow to rotational flow as the indentation progresses, and the major features can be predicted without detailed crystallographic knowledge. Here we present a model for rotational flow under spherical indenters, based on the slip circle construction which has already been applied to pyramidal indenters. By using the magnitude of a representative Burgers vector as a scale parameter, it is also possible to estimate the approximate size at which the transition from laminar to rotational flow occurs. We find that this straightforward model produces predictions which agree well with the available hardness data for spherical indenters.
condensed matter, structural, mechanical & thermal
0022-3727
74001
Czerski, H.
7d291075-9bab-46f8-9005-21b31220b96a
Brown, L.M.
79d5de67-4dbb-4692-ab2d-e731cd54f7cb
Czerski, H.
7d291075-9bab-46f8-9005-21b31220b96a
Brown, L.M.
79d5de67-4dbb-4692-ab2d-e731cd54f7cb

Czerski, H. and Brown, L.M. (2008) Application of the slip circle construction to a spherical indenter. Journal of Physics D: Applied Physics, 41 (7), 74001. (doi:10.1088/0022-3727/41/7/074001).

Record type: Article

Abstract

Precise prediction of plastic flow patterns during indentation is difficult, due to the presence of many possible slip systems and the complexity of dislocation interactions. However, some general patterns of behaviour are observed, in particular a transition from laminar flow to rotational flow as the indentation progresses, and the major features can be predicted without detailed crystallographic knowledge. Here we present a model for rotational flow under spherical indenters, based on the slip circle construction which has already been applied to pyramidal indenters. By using the magnitude of a representative Burgers vector as a scale parameter, it is also possible to estimate the approximate size at which the transition from laminar to rotational flow occurs. We find that this straightforward model produces predictions which agree well with the available hardness data for spherical indenters.

Full text not available from this repository.

More information

e-pub ahead of print date: 12 March 2008
Published date: April 2008
Additional Information: Hardness is a widely-used measurement in the assessment of material properties. Indentation is one of the standard hardness tests used, because of its ease and cheapness, but relating indentation results to atomic level material properties is difficult. This paper presents a new theory for describing stress and flow in a material undergoing a particular type of indentation test, and provides a way of assessing transitions between different slip regimes without detailed crystallographic knowledge.
Keywords: condensed matter, structural, mechanical & thermal

Identifiers

Local EPrints ID: 165649
URI: https://eprints.soton.ac.uk/id/eprint/165649
ISSN: 0022-3727
PURE UUID: 5b8f2e94-6700-46fe-ba84-505d5121e9ca

Catalogue record

Date deposited: 19 Oct 2010 08:58
Last modified: 18 Jul 2017 12:27

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