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Meccanica

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03-01-2018

Stress–softening effect of SBR/nanocomposites by a phenomenological Gent–Zener viscoelastic model

Author: Evagelia Kontou

Published in: Meccanica | Issue 9/2018

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Abstract

An experimental study of a tensile loading–unloading procedure, as well as multi-cyclic response in a strain-controlled program of a Styrene-Butadiene (SBR) elastomer reinforced with four different weight fractions of carbon nanotubes (CNTs) has been performed. The Mullins effect features, namely hysteresis, damage and residual strain, exhibited by the SBR/nanocomposites were analyzed by a modified Gent–Zener rheological model, and a damage function. Especially for the multi-cyclic stress–strain curves, phenomenological equation of the model parameters evolution with strain were also introduced. The same loading procedure was applied in pre-stressed materials, revealing a different stress–strain response due to strain prehistory. The model has been proven to accurately capture the loading–unloading behavior, the residual strain, hysteresis loops as well as the multi-cyclic behavior of the SBR/CNT nanocomposites.

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Title: Stress–softening effect of SBR/nanocomposites by a phenomenological Gent–Zener viscoelastic model
Author: Evagelia Kontou
Publication date: 03-01-2018
Publisher: Springer Netherlands
Published in: Meccanica / Issue 9/2018
Print ISSN: 0025-6455
Electronic ISSN: 1572-9648
DOI: https://doi.org/10.1007/s11012-017-0812-0

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