Optimization of hybrid polymer composites under uniaxial traction

Fábio Monteiro Conde (DEMI, Faculty of Science and Technology, NOVA University of Lisbon, Caparica, Portugal and IDMEC, University of Lisbon, Lisbon, Portugal)
Pedro Gonçalves Coelho (DEMI, Faculty of Science and Technology, NOVA University of Lisbon, Caparica, Portugal and UNIDEMI, FCT, Caparica, Portugal)
Rodrigo Paiva Tavares (DEMec, FEUP, University of Porto, Porto, Portugal, INEGI, FEUP, Porto, Portugal and AMADE, Polytechnic School, University of Girona, Girona, Spain)
Pedro Castro Camanho (DEMec, FEUP, University of Porto, Porto, Portugal and INEGI, FEUP, Porto, Portugal)
José Miranda Guedes (DEM, IST, University of Lisbon, Lisbon, Portugal and IDMEC, University of Lisbon, Lisbon, Portugal)
Helder Carriço Rodrigues (DEM, IST, University of Lisbon, Lisbon, Portugal and IDMEC, University of Lisbon, Lisbon, Portugal)

Engineering Computations

ISSN: 0264-4401

Publication date: 16 April 2018

Abstract

Purpose

This study aims to achieve a “pseudo-ductile” behaviour in the response of hybrid fibre reinforced composites under uniaxial traction by solving properly formulated optimization problems.

Design/methodology/approach

The composite material model is based on the combination of different types of fibres (with different failure strains or strengths) embedded in a polymer matrix. The composite failure under tensile load is predicted by analytical models. An optimization problem formulation is proposed and a Genetic Algorithm is used. Multi-objective optimization problems balancing failure strength and ductility criteria are solved providing optimal mixtures of fibres whose properties may come either from a pre-defined list of materials, currently available in the market, or simply assuming their continuum variation within predefined bounds, in an attempt to attain unprecedented performance levels.

Findings

Optimal solutions of hybrid fibre reinforced composites exhibiting pseudo-ductile behaviour are presented. It is found that a fibre made from a material exhibiting relatively low stiffness combined with high strength is preferred for hybridization. Furthermore, the ratio of the average failure/critical strains between the low and high elongation fibres to be hybridized must be equal or greater than two.

Originality/value

Typically, a ductile failure is an inherent property of metals, that is, their typical response curve after the linear (elastic) region exhibits a yielding plateau still followed by an increase in stress till collapse. In stark contrast, composite materials exhibit (under some loading conditions) brittle failure that may limit their widespread usage. Therefore, a “pseudo-ductility” in composites is valued and targeted through optimization which is the main original contribution here.

Keywords

Citation

Conde, F., Coelho, P., Tavares, R., Camanho, P., Guedes, J. and Rodrigues, H. (2018), "Optimization of hybrid polymer composites under uniaxial traction", Engineering Computations, Vol. 35 No. 2, pp. 904-931. https://doi.org/10.1108/EC-11-2017-0427

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Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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