Title: Elasto-plastic response of graphene nanoplatelets reinforced polymer composite materials

Authors: Wiyao Azoti; Ahmed Elmarakbi; Hisham El-Hage; Mustafa Elkady

Addresses: Faculty of Engineering and Advanced Manufacturing, University of Sunderland, SR6 0DD, UK ' Faculty of Engineering and Advanced Manufacturing, University of Sunderland, SR6 0DD, UK ' Lebanese International University Beirut, P.O. Box 146404, Mouseitbeh, Mazraa, Lebanon ' Lebanese International University Beirut, P.O. Box 146404, Mouseitbeh, Mazraa, Lebanon

Abstract: In this paper, graphene nanoplatelets GNPs have been used as continuum phases within polymer composite materials. For such a purpose, a multi-scale strategy embedding the constitutive law of each material phase is accounted for to obtain the effective properties. The elasto-plastic response is established in the framework of the J₂ plasticity. An expression of the algorithmic tangent operator for each phase is obtained and used as uniform modulus for homogenisation purpose. Using the Mori-Tanaka scheme, the effective non-linear behaviour is predicted for micro-parameters such as the aspect ratio and volume fractions. The results are compared to available experimental data as well as modelling from the literature. They show an enhancement of the equivalent macro stress-strain response with respect to low aspect ratio corresponding to platelet-like inclusions. Also, the volume fraction is seen to improve the composite response.

Keywords: graphene composites; Mori-Tanaka scheme; elasto-plasticity; effective properties.

DOI: 10.1504/IJAUTOC.2017.091413

International Journal of Automotive Composites, 2017 Vol.3 No.2/3/4, pp.226 - 236

Received: 09 Feb 2017
Accepted: 07 Aug 2017
Published online: 30 Apr 2018 *

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