# Short Beam Three Point Bend Tests in Syntactic Foams. Part I: Microscopic Characterization of the Failure Zones

Kishore, * and Shankar, Ravi and Sankaran, S (2005) Short Beam Three Point Bend Tests in Syntactic Foams. Part I: Microscopic Characterization of the Failure Zones. In: Journal of Applied Polymer Science, 98 (2). pp. 673-679.

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## Abstract

Scanning Electron Microscopic (SEM) studies were carried out on the failure surface of syntactic foam material tested in a short beam three point bend test (SBT) by employing $21 \times 15 \times 3 mm^3$ dimension bearing specimens. The syntactic foams were fabricated using glass microballoons in epoxy binder. The failure of the tensile, compression, and shear dominated regions were studied by SEM at different magnifications. The tensile region had characteristic features, such as partial debonding of the microballoons from the matrix and cracking of glass microballoons, apart from matrix cracking and some river pattern features. The compression side was characterized by crushing and collapsing of microballoons, resulting in accumulation of debris with no apparent river pattern for matrix-rich regions. The midway positions of the SBT failed surface comprised of deformation bands in the matrix and occasional debonding of microballoons. The morphology recorded in the tensile and compression regions corroborated well with the results obtained on these foam samples in those specimens that were subjected to pure uniaxial tension and compression, respectively.

Item Type: Journal Article The copyright belongs to Wiley Periodicals, Inc. Failure zones;Short beam bend test;Syntactic foam;Microscopy Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) 28 Mar 2006 19 Sep 2010 04:25 http://eprints.iisc.ernet.in/id/eprint/6124