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Damage and damping of short-glass-fibre-reinforced PBT composites under dynamic conditions: Effect of matrix behaviour

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journal contribution
posted on 2019-08-22, 14:51 authored by Dani Abdo, Andy GleadallAndy Gleadall, Vadim SilberschmidtVadim Silberschmidt
The effect of a thermoplastic polyester elastomer (TPEE) on the damping properties and energy dissipation of PBT (polybutylene terephthalate) reinforced with short glass fibres is investigated in this study. Dynamic mechanical analysis (DMA) showed that tan δ increased significantly as a result of the incorporation of TPEE, especially for frequencies below 60 Hz. With increasing frequency, the storage modulus increased and the loss moduli decreased, with the loss modulus being higher for the TPEE composite. Tensile cyclic loading tests showed that more energy was dissipated during the first loading/unloading cycle for PBT TPEE composites than for PBT ones. Damage, characterized by degradation of the elastic modulus during sequential loading-unloading cycles, was analysed at strain-rates of 0.1, 0.2, 0.8 and 3.2 s−1. These experiments confirmed the DMA results and demonstrated that the TPEE composite dissipated more energy than the comparable PBT samples. SEM analysis showed that the incorporation of TPEE weakened the fibre-matrix interfacial bonding, especially in the ductile zones of the fracture surface. Moreover, localized deformation in the interface zone between glass fibres and the matrix was affected by the visco-damage behaviour, explaining the increase in the tan δ value for the TPEE composite.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Composite Structures

Volume

226

Publisher

Elsevier Ltd

Version

  • AM (Accepted Manuscript)

Rights holder

© Elsevier Ltd

Publisher statement

This paper was accepted for publication in the journal Composite Structures and the definitive published version is available at https://doi.org/10.1016/j.compstruct.2019.111286.

Acceptance date

2019-07-30

Publication date

2019-08-03

Copyright date

2019

ISSN

0263-8223

Language

  • en

Depositor

Prof Vadim Silberschmidt

Article number

111286

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