Three-dimensional in situ observations of compressive damage mechanisms in syntactic foam using X-ray microcomputed tomography

Kartal, M.E., Dugdale, L.H., Harrigan, J.J., Siddiq, M.A., Pokrajac, D. and Mulvihill, D.M. (2017) Three-dimensional in situ observations of compressive damage mechanisms in syntactic foam using X-ray microcomputed tomography. Journal of Materials Science, 52(17), pp. 10186-10197. (doi:10.1007/s10853-017-1177-4)

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Abstract

Syntactic foams with hollow glass microspheres embedded in an epoxy matrix are used in marine, aerospace and ground transportation vehicle applications. This work presents an in situ experimental study of failure mechanisms in syntactic foam based on X-ray microcomputed tomography with uniaxial compression. Under different levels of compressive strain, the material was scanned using X-ray microcomputed tomography to obtain three-dimensional (3D) images of its internal microstructure. Experiments with the same parameters were carried out to investigate repeatability. The microscopic observations have suggested that damage nucleation occurs at the weakest microspheres. When applied strain increases, shear collapse bands (SCBs) develop local to the fragmented microspheres due to stress concentration and bending deformation around SCBs occurs. After significant strain, the thickness of the SCBs increases owing to the accumulation of the broken microspheres. The relationship between the volume fraction of microspheres and applied bulk strain has been characterised.

Item Type:Articles
Additional Information:This work was financially supported by the Lloyd’s Register Foundation Centre, the Royal Society (RG140680), and Oil and Gas Academy of Scotland.
Keywords:Composites
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Mulvihill, Dr Daniel
Authors: Kartal, M.E., Dugdale, L.H., Harrigan, J.J., Siddiq, M.A., Pokrajac, D., and Mulvihill, D.M.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Journal of Materials Science
Publisher:Springer
ISSN:1573-4803
ISSN (Online):1573-4803
Published Online:31 May 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Journal of Materials Science 52(17):10186-10197
Publisher Policy:Reproduced under a Creative Commons License

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