4.4 Article

Quasi-static and dynamic compressive properties of ceramic microballoon filled syntactic foam

Journal

JOURNAL OF COMPOSITE MATERIALS
Volume 49, Issue 10, Pages 1255-1266

Publisher

SAGE PUBLICATIONS LTD
DOI: 10.1177/0021998314533362

Keywords

Syntactic foam; ceramic microballoon; compressive properties; experimental analysis; Split Hopkinson Pressure Bar

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The compressive behaviour of epoxy based syntactic foams filled by ceramic microballoons is experimentally investigated in this study. Nine different types of syntactic foams are fabricated with three different microballoon sizes and three different microballoon fractions. All of the syntactic foam specimens are tested at various strain rates from quasi-static to high strain rates. Analysis of the results is carried out on the effect of the volume fraction, microballoon size and strain rate on the compressive behaviour of syntactic foams. Also, scanning electron microscopy is used to understand the fracture mechanisms of tested specimens. The results show that as the microballoon volume fraction increases the compressive strength, compressive modulus, failure strain and plateau stress decreases for all types of syntactic foams at all strain rates. Although, this decrease is slight for 20% and 40% volume fraction, it is considerable for 60% microballoon volume fraction syntactic foam. The results indicate that reducing the microballoon size or increasing the strain rate of testing would enhance the compressive strength.

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