X-ray microtomographic characterization and quantification of the strain rate dependent failure mechanism in cenosphere epoxy syntactic foams

Huang, R., Li, P., Wang, Z. and Liu, T. (2016) X-ray microtomographic characterization and quantification of the strain rate dependent failure mechanism in cenosphere epoxy syntactic foams. Advanced Engineering Materials, 18(9), pp. 1550-1555. (doi:10.1002/adem.201600215)

[img]
Preview
Text
145489.pdf - Accepted Version

1MB

Abstract

This work investigates the failure mechanism in cenosphere epoxy syntactic foams at the quasi-static and dynamic strain rates. Split-Hopkinson pressure bar experiments are controlled to stop dynamic deformation of the foams at various strain stages. The internal microstructure at each strain is characterized in the x-ray microtomography and compared to the microstructure in the foams deformed quasi-statically. The microscopic observations reveal that the failure process in syntactic foams at the low and high rates is dominated by the crushing of cenospheres and the cracking of the epoxy matrix. However, the mechanism of failure in the foam is significantly affected by the strain rate. Compared to quasi-static compression, macro-cracks form earlier in the matrix at dynamic rates and can propagate to split cenospheres. The volume of the damage as defined by the failure of both cenospheres and the matrix is calculated from the x-ray microtomographic images. It is found that the damage can be quantitatively related to the strain and the strain rate using an empirical equation.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Dr Peifeng
Authors: Huang, R., Li, P., Wang, Z., and Liu, T.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Advanced Engineering Materials
Publisher:Wiley
ISSN:1438-1656
ISSN (Online):1527-2648
Published Online:18 July 2016
Copyright Holders:Copyright © 2016 Wiley-VHC Verlag GmbH & Co.
First Published:First published in Advanced Engineering Materials 18(9): 1550-1555
Publisher Policy:Reproduced in accordance with the publisher copyright policy

University Staff: Request a correction | Enlighten Editors: Update this record