Influence of auxeticity of reinforcements on the overall properties of viscoelastic composite materials

Azoti, Wiyao, Bonfoh, N., Koutsawa, Y., Belouettar, S. and Lipinski, P. (2013) Influence of auxeticity of reinforcements on the overall properties of viscoelastic composite materials. Mechanics of Materials, 61. pp. 28-38. ISSN 0167-6636

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Abstract

This work aims to analyze the damping response of viscoelastic composite reinforced by elastic auxetic heterogeneities by means of micromechanical modeling. The linear viscoelastic problem can be transformed into the associated elastic one via the Carson-Laplace transform (C-LT). Loss factors are taken into account by the introduction of the frequency-dependent complex stiffness tensors of the viscoelastic phases. The micromechanical formalism, based on the kinematic integral equation, leads to the computation of effective storage modulus and its associated loss factor in the quasi-static domain. The possibility to enhance viscoelastic (VE) properties of a polymeric material such as PVB is examined through several mixing configurations. Thus, the use of elastic auxetic heterogeneities is analyzed in comparison with classical elastic and viscoelastic reinforcements. The model predictions for VE phases, confirm the possibility to improve the global material stiffness. Also, it is shown in the particular case of elastic and spherical heterogeneities, by a proper choice of phases' stiffness ratio Q, that auxetic reinforcements represent a good compromise to have simultaneously enhanced stiffness and loss factor response in composite materials.

Item Type: Article
Uncontrolled Keywords: Auxetic composites; Frequency-dependent; Linear viscoelastic; Loss factor; Micro-mechanical modeling; Viscoelastic; Viscoelastic composite materials; Viscoelastic composites, Composite materials; Elastic moduli; Laplace transforms; Micromechanics; Stiffness, Reinforcement
Subjects: Engineering > Mechanical Engineering
Divisions: Faculty of Applied Sciences > Department of Computing Engineering and Technology
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Depositing User: Wiyao Azoti
Date Deposited: 16 Dec 2015 09:20
Last Modified: 16 Dec 2015 09:20
URI: http://sure.sunderland.ac.uk/id/eprint/5792

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