Flexural Properties of Epoxy Matrix Composites Reinforced by Milled Fibers

Subject Areas : journal of New Materials

S. Karimi ¹ (فارغالتحصیل دکتری تخصصی مهندسی مواد- بخش مهندسی مواد- دانشگاه شیراز)
S. Javadpour ² (استاد و عضو هیئت علمی بخش مهندسی مواد- دانشگاه شیراز)

Received: 2016-07-26 Accepted : 2016-07-26 Published : 2016-04-20

Keywords: Carbon fiber, Glass fiber, Milling, Epoxy matrix composite, Bending test,

Abstract :

       Flexural properties of milled E-glass, S-glass, and high strength carbon fiber reinforced epoxy composites have been studied. As received fibers were chopped and milled by an attrition mill, and their morphologies were evaluated by Scanning Electron Microscope (SEM). The epoxy composites were prepared simply by mixing and stirring 1wt.% of the milled fibers with a conventional hot-cure epoxy resin. The effects of resin system degassing and employing a coupling agent (γ-aminopropyltriethoxysilane or γ-APS) were evaluated based on the flexural properties of the epoxy composites. The SEM micrographs of the fracture surfaces were used to investigate the active toughening mechanisms. The most appropriate flexural properties were obtained for the degassed and modified milled E-glass fiber reinforced epoxy. Its bending strength and tangent modulus of elasticity were enhanced up to 1.22 and 1.20 times in comparison to the pristine one. The current study shows that the composite not only is cost effective, but also offers higher flexural strength and tangent modulus of elasticity

References:

1- ASM Handbook: Composites, p. 161-162, ASM International, 2001.

2- W. Jiang, F. L. Jin and S. J. Park, "Thermo-Mechanical Behaviors of Epoxy Resins Reinforced with Nano-Al₂O₃ Particles", Journal of Industrial and Engineering Chemistry, Vol. 18, pp.  594-496, 2001.

3- G. Akovali, Handbook of composite fabrication, p. 26-27, iSmithers Rapra Publishing, Ankara, 2001.

4- S. Rana, R. Alagirusamy and M. Joshi, "Development of Carbon Nanofibre Incorporated Three Phase Carbon/Epoxy Composites with Enhanced Mechanical, Electrical and Thermal Properties", Composites Part A: Applied Science and Manufacturing, Vol. 42, pp. 439-445, 2011.

5- H. A. Al-Turaif, "Effect of Nano TiO₂ Particle Size on Mechanical Properties of Cured Epoxy Resin", Progress in Organic Coatings, Vol. 69, pp. 241-246, 2010.

6- M. Martin, S. Hanagud and N. Thadhani, "Mechanical Behavior of Nickel+Aluminum Powder-Reinforced Epoxy Composites", Materials Science and Engineering: A, Vol. 443, pp. 209-218, 2007.

7- M. Nadler, J. Werner, T. Mahrholz, U. Riedel and W. Hufenbach, "Effect of CNT Surface Functionalisation on the Mechanical Properties of Multi-Walled Carbon Nanotube/Epoxy-Composites", Composites Part A: Applied Science and Manufacturing, Vol. 40, pp. 932-937, 2009.

8- K. T. Lau, S. Q. Shi, L. M. Zhou and H. M. Cheng, "Micro-Hardness and Flexural Properties of Randomly-Oriented Carbon Nanotube Composites", Journal of Composite Materials, Vol. 37, pp. 365-376, 2003.

9- M. Moniruzzaman, F. Du, N. Romero and K. I. Winey, "Increased Flexural Modulus and Strength in SWNT / Epoxy Composites by a New Fabrication Method", Polymer, Vol. 47, pp. 293-298, 2006.

10- J. Milewski, "A Study of the Packing of Milled Fibreglass and Glass Beads", Composites, Vol. 4, pp. 258-265, 1973.

11- T. Cotgreave, "Milled Fibre Reinforced Epoxy Resin - an Engineering Polymer Composite", Polymer, Vol. 26, pp. 1419-1422, 1985.

12- P. Vasconcelos, F. Lino, A. Magalhaes and R. Neto, "Impact Fracture Study of Epoxy-Based Composites with Aluminium Particles and Milled Fibres", Journal of Materials Processing Technology, Vol. 170, pp. 277-283, 2005.

13- N. Chand and A. Naik, "Development and High Stress Abrasive Wear Behavior of Milled Carbon Fiber Reinforced Epoxy Gradient Composites", Polymer Composites, Vol. 29, pp. 736-744, 2008.

14- N. Chand and A. Nigrawal, "Investigations on DC Conductivity Behaviour of Milled Carbon Fibre Reinforced Epoxy Graded Composites", Bulletin of Materials Science, Vol. 31, pp. 665-668, 2008.

15- N. Chand and M. K. Sharma, "Development and Sliding Wear Behaviour of Milled Carbon Fibre Reinforced Epoxy Gradient Composites", Wear, Vol. 264, pp. 69-74, 2008.

16- ASTM D790 (2003), "Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials".

17- M. Azlan, "The Effect of Voids on the Flexural Fatigue Properties of Carbon/Epoxy Composites", Ph.D. Thesis Univiersity of Southampton, School of Engineering Science, 2010.

18- H. He and K. Li, "Silane Coupling Agent Modification on Interlaminar Shear Strength of Carbon Fiber / Epoxy / Nano-CaCO₃ Composites", Polymer Composites, Vol. 33, pp. 1755-1758, 2012.

19- E. Földes, J. Gulyás, S. Rosenberger and B. Pukánszky, "Chemical Modification and Adhesion in Carbon Fiber/Epoxy Micro Composites; Coupling and Surface Coverage", Polymer Composites, Vol. 21, pp. 387-395, 2000.

20- R. M. Jones, Mechanics of Composite Materials, 2ed., p., 164-165, CRC Press, London, 1998.

21- R. A. Pearson and A. F. Yee, "Influence of Particle Size and Particle Size Distribution on Toughening Mechanisms in Rubber-Modified Epoxies", Journal of Materials Science, Vol. 26, pp. 3828-3844, 1991.

22- H. H. Kim, S. Y. Kim, D. H. Kim, C. Y. Oh and N. J. Jo, "Effect of Silane Coupling Agent on the Flexural Property of Glass Fiber Reinforced Composite Film", Journal of Materials Science and Chemical Engineering, Vol. 2, pp. 38-42, 2014.

23- M. Etcheverry and S. E. Barbosa, "Glass Fiber Reinforced Polypropylene Mechanical Properties Enhancement by Adhesion Improvement", Materials, Vol. 5, pp. 1084-1113, 2012.

24- J. K. Kim and Y. W. Mai, Engineered Interfaces in Fiber Reinforced Composites, p., 174-183, Elsevier, New York, 1998.