Measurement of fracture toughness, mechanical and electrical loss tangents of calcium carbonate reinforced vinyl ester composites

Eddine, Mustapha Jamal (2009) Measurement of fracture toughness, mechanical and electrical loss tangents of calcium carbonate reinforced vinyl ester composites. [USQ Project] (Unpublished)

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Abstract

Vinyl ester resin was reinforced with calcium carbonate powder in an attempt to increase fracture toughness of the composites for structural applications. A considerable percentage by weight of calcium carbonate powder would be added to reduce the composite cost but at the same time the fracture toughness of it would be maintained. The composites were cast to shape and then cured in ambient conditions. After that, they were post-cured in a conventional oven. The composite specimens were then subjected to short bar tests to measure their fracture toughness. It was found that the toughest composite was made from pure resin. However, the fracture toughness had a sudden increase for the composite with 35% by weight of the filler but it was still much lower than that of pure resin. Scanning electron microscope (SEM) was also employed to analyse the failure modes of the specimens and it was found that the fractured surfaces examined correlated with the fracture toughness. As far as fracture toughness was concerned, calcium carbonate was not a suitable filler for vinyl ester resin. Moreover, dynamic mechanical analysis (DMA) and loss tangent measurements were conducted on the specimens. From these measurements, it was observed that the oven post-curing process increased the stiffness of the composites; but decreased their electrical loss tangent.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 20 Jul 2010 03:14
Last Modified: 21 Jul 2010 05:06
Uncontrolled Keywords: materials testing; composites; fracture
Fields of Research (FOR2008): 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
URI: http://eprints.usq.edu.au/id/eprint/8397

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