The Effect of Mould Size on the Exothermic Reaction and Compressive Strength of Epoxy Resin Chocks.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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A study was conducted on the effects of mould size on the exothermic reaction that occurs during the curing of epoxy resin chocks. Moulds of CHOCKFAST ORANGE were cast with lateral dimensions of 3 by 3 inches, 6 by 6 inches and 9 by 9 inches. with thicknesses of 12, 1 and 1-12 inches. Results showed that the degree of exotherm increased with increased chock thickness. The 12 inch thick samples showed very little temperature rise, with the temperature increasing linearly with time. The 1 inch thick samples, beginning with the 6 by 6 by 1 inch sample, and the 1-12 inch samples experienced a two stage exothermic reaction, with temperature increasing linearly initially and then exponentially during th second stage. Stress versus strain pilots revealed a significant increase in ductility with the increased exotherms, resulting in substantially higher ultimate strengths. Chock specimens experiencing the second stage, exponential temperature rise has ultimate strengths consistently in excess of 20,000 psi, compared to 16,000 to 17,000 psi to those specimens that did not.
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