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Combining FEM and MD to simulate C60/PA-12 nanocomposites

Georgios I. Giannopoulos (Department of Materials Science, University of Patras , Patras, Greece)
Stelios K. Georgantzinos ( National and Kapodistrian University of Athens , Athens, Greece)
Androniki Tsiamaki (Department of Mechanical Engineering and Aeronautics, University of Patras , Patras, Greece)
Nicolaos Anifantis (Department of Mechanical Engineering and Aeronautics, University of Patras , Patras, Greece)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 12 June 2019

Issue publication date: 19 July 2019

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Abstract

Purpose

The purpose of this paper is the computation of the elastic mechanical behaviour of the fullerene C60 reinforced polyamide-12 (PA-12) via a two-stage numerical technique which combines the molecular dynamics (MD) method and the finite element method (FEM).

Design/methodology/approach

At the first stage, the proposed numerical scheme utilizes MD to characterize the pure PA-12 as well as a very small cubic unit cell containing a C60 molecule, centrally positioned and surrounded by PA-12 molecular chains. At the second stage, a classical continuum mechanics (CM) analysis based on the FEM is adopted to approximate the elastic mechanical performance of the nanocomposite with significantly lower C60 mass concentrations. According to the computed elastic properties arisen by the MD simulations, an equivalent solid element with the same size as the unit cell is developed. Then, a CM micromechanical representative volume element (RVE) of the C60 reinforced PA-12 is modelled via FEM. The matrix phase of the RVE is discretized by using solid finite elements which represent the PA-12 mechanical behaviour predicted by MD, while the C60 neighbouring location is meshed with the equivalent solid element.

Findings

Several multiscale simulations are performed to study the effect of the nanofiller mass fraction on the mechanical properties of the C60 reinforced PA-12 composite. Comparisons with other corresponding experimental results are attempted, where possible, to test the performance of the proposed method.

Originality/value

The proposed numerical scheme allows accurate representation of atomistic interfacial effects between C60 and PA-12 and simultaneously offers a significantly lower computational cost compared with the MD-only method.

Keywords

Citation

Giannopoulos, G.I., Georgantzinos, S.K., Tsiamaki, A. and Anifantis, N. (2019), "Combining FEM and MD to simulate C60/PA-12 nanocomposites", International Journal of Structural Integrity, Vol. 10 No. 3, pp. 380-392. https://doi.org/10.1108/IJSI-10-2018-0071

Publisher

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Emerald Publishing Limited

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