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Theoretical and experimental analysis of indentation relaxation test

Published online by Cambridge University Press:  09 June 2017

Paul Baral Open the ORCID record for Paul Baral [Opens in a new window] ,
Gaylord Guillonneau ,
Guillaume Kermouche ,
Jean-Michel Bergheau  and
Jean-Luc Loubet
Paul Baral*
Affiliation:
Université de Lyon, Ecole Centrale de Lyon, LTDS UMR CNRS 5513, Ecully, France
Gaylord Guillonneau
Affiliation:
Université de Lyon, Ecole Centrale de Lyon, LTDS UMR CNRS 5513, Ecully, France
Guillaume Kermouche
Affiliation:
Ecole des Mines de Saint Etienne, Centre SMS, Laboratoire LGF UMR 5307, Saint Etienne, France
Jean-Michel Bergheau
Affiliation:
Université de Lyon, Ecole Nationale d'Ingénieurs de Saint Etienne, LTDS UMR CNRS 5513, Saint Etienne, France
Jean-Luc Loubet
Affiliation:
Université de Lyon, Ecole Centrale de Lyon, LTDS UMR CNRS 5513, Ecully, France
*
a) Address all correspondence to this author. e-mail: paul.baral@doctorant.ec-lyon.fr
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Abstract

Indentation relaxation test is investigated from theoretical and experimental points of view. Analytical expressions are derived based on the conical indentation of a homogeneous linear viscoelastic half space. Two loading kinetics prior to the hold displacement segment are studied—i.e., constant displacement rate and constant strain rate. Effects of loading procedure on measured relaxation behavior are considered. It is pointed out that a constant strain rate loading is required to perform depth-independent relaxation measurements and the strain rate affects the relaxation spectrum up to a critical time constant. Few experiments on poly(methyl methacrylate) are then performed to check the consistency of the analytical results. Some experimental limitations are also discussed. Good agreement is found between analytical calculations and experimental measurement trends, especially for the constant strain rate loading effect on the measured relaxation behavior.

Keywords

nano-indentationviscoelasticitypolymer

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Type
Articles
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Journal of Materials Research , Volume 32 , Issue 12 , 28 June 2017 , pp. 2286 - 2296
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Linda S. Schadler

References

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