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Micromechanical modeling and experimental characterization of the non linear behavior of platelet-reinforced nanocomposites

Published online by Cambridge University Press:  05 August 2009

Ludovic Cauvin ,
Djimedo Kondo ,
Mathias Brieu  and
Naresh Bhatnagar
Ludovic Cauvin
Affiliation:
Laboratoire de Mécanique de Lille, Boulevard Paul Langevin, 59655 Villeneuve d'Ascq, France
Djimedo Kondo
Affiliation:
Laboratoire de Mécanique de Lille, Boulevard Paul Langevin, 59655 Villeneuve d'Ascq, France
Mathias Brieu
Affiliation:
Laboratoire de Mécanique de Lille, Boulevard Paul Langevin, 59655 Villeneuve d'Ascq, France
Naresh Bhatnagar
Affiliation:
Mech. Eng. Dpt., Indian Institute of Technology, HausKhaz, New Delhi, India
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Abstract

Nanocomposites with platelet reinforcements are emergent materials whose deformation mechanisms still need to be carefully investigated. In this study, we first present the studied class of nanocomposites (Polypropylene reinforced by Montmorillonite clay nanoplatelets). From uniaxial tensile tests, it is shown that some mechanical characteristics of the nanocomposite (Young's modulus, yield stress) significantly increase compared to the matrix even for very low volume fraction of reinforcements (maximum of 7% mass fraction for our tested specimen). The Ponte Castañeda and Willis [6] bound is adopted to account for the evolution of the elastic behavior of the material [7]. Adapting the Hill-type incremental method [13] allows the simulation of the non linear behaviour of the material. However, it is shown that this scheme requires careful choice of the aspect ratio, in the plastic domain, to provide good predictions of plasticity.

Keywords

NanocompositesPolypropyleneMontmorilloniteExperimental studyNon linear homogenizationNanocompositePolypropylèneMontmorilloniteEssais mécaniquesHomogénéisation non linéaire
Type
Research Article
Information
Mechanics & Industry , Volume 10 , Issue 3-4: 19e Congrès français de mécanique (CFM 2009) , May 2009 , pp. 291 - 297
Copyright
© AFM, EDP Sciences, 2009

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