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Lookup NU author(s): Dr Yuan XuORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024 The Author(s)This study introduces a comprehensive experimental methodology allowing for the direct measurement of the rate dependent multiaxial response of polymer syntactic foams under combined direct-shear loading. The combined tension-torsion behaviour of a syntactic foam and its rate dependence are investigated for the first time. Dynamic tension-torsion experiments were conducted using a newly developed Tension-Torsion Hopkinson Bar (TTHB) enabling the measurement of the combined tensile-shear response of engineering materials at high rates of strain. The response and multiaxial failure envelope of a polyamide syntactic foam were experimentally measured and analysed to determine the combined influences of stress state, strain rate, and temperature. The multiaxial failure stress locus was defined in both the normal versus shear stress space and the principal stress space, providing a comprehensive characterisation of the behaviour of the material under various loading and environmental conditions. The suitability of existing pressure dependent failure criteria to represent the measured experimental data was also assessed. The Drucker-Prager pressure dependent criterion proved to be effective in capturing the measured quasi-static and dynamic multi-axial stress loci at different temperatures. The effects of temperature, loading rate and stress state on the deformation and failure modes were analysed by means of SEM micrographs of the tested samples.
Author(s): Chen Y, Xu Y, Pellegrino A
Publication type: Article
Publication status: Published
Journal: International Journal of Mechanical Sciences
Year: 2025
Volume: 286
Print publication date: 15/01/2025
Online publication date: 30/11/2024
Acceptance date: 27/11/2024
Date deposited: 16/12/2024
ISSN (print): 0020-7403
ISSN (electronic): 1879-2162
Publisher: Elsevier Ltd
URL: https://doi.org/10.1016/j.ijmecsci.2024.109864
DOI: 10.1016/j.ijmecsci.2024.109864
Data Access Statement: Data will be made available on request.
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