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Cyclic indentation of polymers: Instantaneous elastic modulus from reloading, energy analysis, and cyclic creep

Published online by Cambridge University Press:  14 October 2019

Olga Smerdova Open the ORCID record for Olga Smerdova [Opens in a new window] ,
Marina Pecora  and
Marco Gigliotti
Olga Smerdova*
Affiliation:
Département Physique et Mécanique des Matériaux, Institut Pprime, CNRS, ISAE-ENSMA, Université de Poitiers, Futuroscope Chasseneuil F-86962, France
Marina Pecora
Affiliation:
Département Physique et Mécanique des Matériaux, Institut Pprime, CNRS, ISAE-ENSMA, Université de Poitiers, Futuroscope Chasseneuil F-86962, France
Marco Gigliotti
Affiliation:
Département Physique et Mécanique des Matériaux, Institut Pprime, CNRS, ISAE-ENSMA, Université de Poitiers, Futuroscope Chasseneuil F-86962, France
*
a)Address all correspondence to this author. e-mail: Olga.smerdova@ensma.fr
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Abstract

An analysis of indentation cyclic behavior of polymers is carried out with the aim to tackle time-dependent behavior of polymer at several time scales by one test. The method consists in cycling the load between a positive close-to-zero value and a maximum peak value (10 mN in this study) for long time with constant loading rate. The short time scale is characterized through the instantaneous elastic modulus determined from reloading curves at each cycle. The advantages of determination of instantaneous elastic modulus from reloading instead of commonly used unloading curves are discussed. The energy dissipation describes viscoelasticity and plasticity at the time scale of one cycle. The evolution of both parameters with cycles along with the cyclic creep describes the long-time viscoelasticity. The cyclic indentation behavior of poly(methyl methacrylate), PR520 epoxy, and high-density polyethylene (HDPE) polymers is analyzed, and a comparison with the macroscopic cyclic behavior of HDPE is presented.

Keywords

nanoindentationpolymerviscoelasticity
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 21 , 14 November 2019 , pp. 3688 - 3698
Copyright
Copyright © Materials Research Society 2019 

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