Mechanical response and dynamic deformation mechanisms of closed-cell aluminium alloy foams under dynamic loading

Islam, M, Brown, A, Hazell, P, Kader, M, Escobedo, J, Saadatfar, M, Xu, S, Ruan, D and Turner, M 2018, 'Mechanical response and dynamic deformation mechanisms of closed-cell aluminium alloy foams under dynamic loading', International Journal of Impact Engineering, vol. 114, pp. 111-122.


Document type: Journal Article
Collection: Journal Articles

Title Mechanical response and dynamic deformation mechanisms of closed-cell aluminium alloy foams under dynamic loading
Author(s) Islam, M
Brown, A
Hazell, P
Kader, M
Escobedo, J
Saadatfar, M
Xu, S
Ruan, D
Turner, M
Year 2018
Journal name International Journal of Impact Engineering
Volume number 114
Start page 111
End page 122
Total pages 12
Publisher Elsevier
Abstract The dynamic compressive response of closed-cell (CYMAT) stabilised aluminium alloy foams (SAF) has been investigated using a modified Split Hopkinson Pressure Bar (SHPB) in conjunction with a high-speed camera. Tests have been carried out on 45 mm diameter and 23 mm thick cylindrical specimens. The elastic-plastic pore collapse mechanism has been investigated using Digital Image Correlation (DIC) and micro-computed X-ray tomography. A stress-strain relationship for individual specimens at different impact velocities has been obtained with the combination of an analytical method and SHPB theory. The large deformation (∼80%) has been measured from eight strain gauges data using a wave separation algorithm. The test results exhibited a significant increase in elastic and plastic strength during the pulse loading. The X-ray tomography data of pre-impacted and post-impacted SAF specimens have been extensively analysed to elucidate the internal elastic-plastic pore collapse mechanisms.
Subject Civil Engineering not elsewhere classified
Aerospace Engineering not elsewhere classified
Mechanical Engineering not elsewhere classified
Keyword(s) high-strain rate
energy-absorbing structures
compressive behavior
metal foams
shock theory
impact
collapse
inertia
rates
DOI - identifier 10.1016/j.ijimpeng.2017.12.012
Copyright notice © 2017 Elsevier Ltd
ISSN 0734-743X
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