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Comparison between Stress-Strain Plots Obtained from Indentation Plastometry, Based on Residual Indent Profiles, and from Uniaxial Testing

38 Pages Posted: 13 Dec 2018 First Look: Under Review

See all articles by JE Campbell

JE Campbell

University of Cambridge - Department of Materials Science and Metallurgy

J. Dean

University of Cambridge - Department of Materials Science and Metallurgy

RP Thompson

University of Cambridge - Department of Materials Science and Metallurgy

TW Clyne

University of Cambridge - Department of Materials Science and Metallurgy

Abstract

This paper is focused on comparisons between stress-strain plots from conventional uniaxial (tensile or compressive) testing and those obtained from indentation experiments, via iterative FEM modeling of the process in which the plasticity is represented using a constitutive law. Both Ludwik-Hollomon and Voce equations are used in the current work. Advantages of a spherical indenter shape, and of using the residual indent profile as the main experimental outcome, are highlighted. It is shown via detailed study of two different materials, with low and high work hardening rates, that the methodology (here termed indentation plastometry) can be used to obtain (nominal) tensile stress-strain curves, which incorporate the onset of necking and the ultimate tensile strength. High levels of fidelity are observed between these and corresponding plots obtained by conventional tensile testing. It is noted that, while there is also excellent consistency with the outcomes of uniaxial compression tests, the latter inevitably involve some experimental complications that are best avoided. It is concluded that indentation plastometry has the potential to become a mainstream testing methodology in the near future.

Keywords: Indentation, inverse FEM, profilometry, residual indent profiles

Suggested Citation

Campbell, JE and Dean, J. and Thompson, RP and Clyne, TW, Comparison between Stress-Strain Plots Obtained from Indentation Plastometry, Based on Residual Indent Profiles, and from Uniaxial Testing (December 13, 2018). Available at SSRN: https://ssrn.com/abstract=3300693 or http://dx.doi.org/10.2139/ssrn.3300693

JE Campbell (Contact Author)

University of Cambridge - Department of Materials Science and Metallurgy

Trinity Ln
Cambridge, CB2 1TN
United Kingdom

J. Dean

University of Cambridge - Department of Materials Science and Metallurgy

Trinity Ln
Cambridge, CB2 1TN
United Kingdom

RP Thompson

University of Cambridge - Department of Materials Science and Metallurgy

Trinity Ln
Cambridge, CB2 1TN
United Kingdom

TW Clyne

University of Cambridge - Department of Materials Science and Metallurgy ( email )

Trinity Ln
Cambridge, CB2 1TN
United Kingdom

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