Elastic behaviour and failure mechanism in epoxy syntactic foams: the effect of glass microballoon volume fractions

Huang, R. and Li, P. (2015) Elastic behaviour and failure mechanism in epoxy syntactic foams: the effect of glass microballoon volume fractions. Composites Part B: Engineering, 78, pp. 401-408. (doi:10.1016/j.compositesb.2015.04.002)

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Abstract

A representative elementary volume (REV) in epoxy syntactic foams was generated to incorporate randomly distributed glass microballoons that followed a log-normal size distribution. Finite element modelling of the REV foam was developed and experimentally validated to investigate the elastic behaviour and failure mechanism in the foams with different microballoon volume fractions (V). The localised stresses concentrate in various zones within the foam, and can cause the vertical splitting fracture of microballoons and the micro-crack formation in the matrix. Dependent on the microballoon volume fraction, micro-cracks can propagate to join adjacent micro-cracks and voids left by fractured microballoons, and finally develop into a macro-crack either in the preferred longitudinal (for low V) or diagonal (for high V) directions. This is consistent with the macroscopic observations of the fracture process in the foam specimens. It was also found that elastic characteristics of the foam vary with microballoon volume fractions.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Dr Peifeng
Authors: Huang, R., and Li, P.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Composites Part B: Engineering
Publisher:Elsevier
ISSN:1359-8368
ISSN (Online):1879-1069
Published Online:10 April 2015

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