The Effects Of Mixing And Curing On Morphological And Mechanical Properties Of Epoxy-Albasia Composites

Henny Pratiwi

Abstract

This research is aimed to know the effect of mixing time, mixing speed and curing temperature on morphological and mechanical properties of epoxy-albasia wood fiber composites. The method used in the manufacturing process was hand lay-up method. The fibers with 30 mesh and 25% volume fraction are mixed with epoxy for the time variations of 15 and 45 minutes by speed variation of 695 rpm, 773 rpm, and 853 rpm. In order to investigate the effects of curing temperature, the same mixture was blended manually for 20 minutes and cured with the temperature variation of 40, 50, 60, 70 and 800C. Experimental results show that mixing the fiber and matrix with the speed of 695 rpm for 15 minutes increases the tensile strength but slightly declines the impact strength. This phenomenon could be possibly caused by the longer the mixing time, the higher the amount of foreign particles entered into the mixture that could affect its properties. Both the tensile and impact tests show that the temperature of 80oC is the optimum curing temperature for epoxy-albasia wood fiber composites. Crack deflection presented by Scanning Electron Microscopy (SEM) micrographs results in an increase in the crack propagation path and in the energy-dissipating events in the region immediately ahead of the crack tip.

Keywords

albasia, epoxy, mixing, curing, mechanical

Full Text:

PDF

References

May, C, Tanaka, T, 1973, Epoxy Resins – Chemistry and Technology, Marcel Dekker Inc., New York.

Lee, H, Neville, K, 1967, Handbook of Epoxy Resins, Mc Graw Hill, New York.

Ellis, B, 1993, Chemistry and Technology of Epoxy Resins, Blackie & Professional, New York.

Sarawut, R, Watanachai, S, Saroj, J, Sunan, T, 2011, ‘Highly Filled Polypropylene Rubber Wood Flour Composites’, Engineering Journal, vol. 15, pp. 17 – 30.

Selke, S, Wichman, I, 2014, ‘Wood/fiber polyolefin composites’, Applied Science and Manufacturing, vol. 35, pp. 321-326.

Tjondro, J, Budianto, H, Aryakusuma, W, 2011, ‘The flexural strength and rigidity of albasia nail-laminated beam’, Civil Engineering Forum Universitas Gadjah Mada, vol. 20, pp. 1211-1217.

Michels ,J, Cruzc, S, Christend, R, Czaderskia, C, Motavallia, M, 2016, ‘Mechanical performance of cold-curing epoxy adhesives after different mixing and curing procedures’, Composites Part B: Engineering, vol. 98, pp. 434 – 443.

Jumahat, A, 2012, ‘Tensile Properties of Nano Silica/Epoxy Nanocomposites’, Procedia Engineering, vol. 41, pp. 1634–1640.

Olivier, P, Cottu, J, Ferret, B, 1995, ‘Effects of cure cycle pressure and voids on some mechanical properties of carbon/epoxy laminates’, Composites, vol. 26, pp. 509–515.

Liu, L, Zhang, BM, Wang, DF, Wu, ZJ, 2006, ‘Experimental characterization of porosity and interlaminar shear strength in polymeric matrix composites’, Chinese Journal of Aeronautics, vol. 26, pp. 115–118.

Koushyar, H, Alavi-Soltani, S, Minaie, B, Violette, M, 2011, ‘Effects of variation in autoclave pressure, temperature, and vacuum-application time on porosity and mechanical properties of a carbon fiber/epoxy composite’, Journal of Composite Materials, vol. 46, pp. 1985–2004.

Liu, L, Zhang, BM, Wang, DF, Wu, ZJ, 2006, Effects of cure cycles on void content and mechanical properties of composite laminates, Composite Structures Journal, vol. 73, pp. 303 – 309.

Campbell, FC, Mallow, AR, Browning, CE, 1995, Porosity in carbon fiber composites an overview of causes, Journal of Advanced Material, vol. 26, pp. 18–33.

Gu, Y, Li, M, Zhang, Z, Sun, ZJ, 2010, Void formation model and measuring method of void formation condition during hot pressing process, Polymer Composites, vol. 31, pp. 1562–1571.

Grunenfelder, LK, Nutt, SR, 2010, Void formation in composite prepregs-effect of dissolved moisture, Composites Science and Technology, vol. 70, pp. 2304–2309.

White, SR, Kim, YK, 1996, Staged curing of composite materials, Composites Part A – Applied Science, vol. 27, pp. 219–227.

Zhang, LG, Zhang, ZG, 2001, ‘Analysis of defects in advanced composites’, Fiber Reinforced Plastic/Composites, vol. 1, pp. 42–45.

Madsen, B, Thygesen, A, Lilholt, H, 2007, ‘Plant fibre composites-porosity and volumetric interaction’, Composites Science and Technology, vol. 67, pp. 1584–1600.

Han, J, Cho, K, 2006, ‘Nanoparticle-induced enhancement in fracture toughness of highly loaded epoxy composites over a wide temperature range’, Journal of Materials Science, vol. 41, pp. 4239 – 4245.

Refbacks

  • There are currently no refbacks.