An evaluation of fracture toughness of vinyl ester composites cured under microwave conditions

Ku, H. and Chan, W. L. and Trada, M. and Baddeley, D. (2007) An evaluation of fracture toughness of vinyl ester composites cured under microwave conditions. Journal of Materials Engineering and Performance, 16 (6). pp. 741-745. ISSN 1059-9495

Abstract

The shrinkage of vinyl ester particulate composites has been reduced by curing the resins under microwave conditions. The reduction in the shrinkage of the resins by microwaves will enable the manufacture of large vinyl ester composite items possible. In tensile tests, the yield strengths of samples cured under microwave conditions obtained are within 5% of those obtained by ambient curing; it is also found that with 180W microwave power, the tensile strengths obtained for all duration of exposure to microwaves are also within the 5% of those obtained by ambient curing. While, with 360W microwave power, the tensile strengths obtained for all duration of exposure to microwaves are 5% higher than those obtained by ambient curing. Whereas, with 540W microwave power, the tensile strengths obtained for most samples are 5% below those obtained by ambient curing. This project, using 33% by weight fly ash reinforced vinyl ester composite [VE/FLYSH (33%)], is to further investigate the difference in fracture toughness between microwave cured vinyl ester particulate composites and those cured under ambient conditions. Higher power microwaves, 540W and 720W with shorter duration of exposure are used to cure the composites. Short bar method of fracture toughness measurement was used to perform the tests. Plastic (PVC) re-usable moulds were designed and manufactured for producing the test samples. The results show that the fracture toughness of specimens cured by microwave conditions are generally higher than those cure under ambient conditions, provided the power level and duration of microwave irradiation are properly and optimally selected.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Deposited in accordance with the copyright policy of the publisher. The original publication is available at www.springerlink.com.
Depositing User: Dr Harry Ku
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 14 Mar 2008 12:21
Last Modified: 02 Jul 2013 22:54
Uncontrolled Keywords: short bar test; microwaves; shrinkage; composites; fly ash; fracture toughness; vinyl ester resin
Fields of Research (FOR2008): 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
01 Mathematical Sciences > 0101 Pure Mathematics > 010102 Algebraic and Differential Geometry
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi: 10.1007/s11665-007-9104-5
URI: http://eprints.usq.edu.au/id/eprint/3573

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