Interlaminar Fracture Toughness of Epoxy Glass Fiber Fly Ash Laminate Composite


Epoxy glass fiber laminate composite (PMCs) are finding ever increasing applications in aerospace and automobile industries due to its high strength to weight ratio and resistance to aqueous environment. Additions of particulate reinforcements in the polymer matrix are reported to improve the Interlaminar Shear Strength and Interlaminar Fracture Toughness of the composites. In the present investigation, epoxy glass fiber laminate composites were processed using hand layup and vacuum bagging technique. The particulate reinforcement precipitator fly ash (25 - 45 μm) was added in the epoxy matrix by mechanical mixing up to 10 wt%. The effects of fly ash reinforcement on the mechanical properties and Interlaminar Fracture Toughness were studied before and after exposure to aqueous fog in a salt fog chamber at 45°C. In unexposed condition Mode I interlaminar fracture toughness of epoxy glass fiber laminate composite improved by the addition of fly ash reinforcement 10% (By weight) by 49.43% and when it was subjected to aqueous fog for 10 days the interlaminar fracture toughness improved 58.42%. Exposure to aqueous fog for 10 days causes plasticization of resin matrix and weakening of fiber/matrix interface results in improvement in interlaminar fracture toughness. The fracture surfaces were analyzed using scanning electron microscopy.

Share and Cite:

Bhandakkar, A. , Kumar, N. , Prasad, R. and Sastry, S. (2014) Interlaminar Fracture Toughness of Epoxy Glass Fiber Fly Ash Laminate Composite. Materials Sciences and Applications, 5, 231-244. doi: 10.4236/msa.2014.54028.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Srivastava, V.K. and Hogg, P.J. (1998) Moisture Effects on the Toughness, Mode-I and Mode-II of Particles Filled Quasi-Isotropic Glass-Fiber Reinforced Polyester Resin Composites. Journal of Materials Science, 33, 1129-1136.
[2] Fu, S.-Y. and Lauke, B. (1998) Characterisation of Tensile Behaviour of Hybrid Short Glass Fibre/Calcite Particle/ ABS Composites. Composites Part A, 29A, 575-583.
[3] Lauke, B. (2008) On the Effect of Particle Size on Fracture Toughness of Polymer Composites. Composite Science and Technology, 68, 3365-3372.
[4] Lee, J. and Yee, A.F. (2000) Fracture of Glass Bead/Epoxy Composites: On Micro-Mechanical Deformations. Polymer, 41, 8363-8373.
[5] Suri, C. and Perreux, D. (1995) The Effects of Mechanical Damage in a Glass Fiber/Epoxy Composite on the Absorption Rate. Composite Engineering, 5, 415-424.
[6] Browning, C.E., Husman, G.E. and Whitney, J.M. (1977) Moisture Effects in Epoxy Matrix Composites. ASTM STP, 617, 481-496.
[7] Ray, B.C. (2006) Temperature Effect during Humid Ageing on Interfaces of Glass and Carbon Fibers Reinforced Epoxy Composites. Journal of Colloid and Interface Science, 298, 111-117.
[8] ASTM D 638-03 (2005) Standard Test Method for Tensile Properties of Plastics. ASTM Standards, 8.
[9] ASTM D 5528-01 (2005) Standard Test Method for Mode-I Interlaminar Fracture Toughness of Unidirectional Fiber Reinforced Polymer Matrix Composite. ASTM Standards, 15.
[10] Rothon, R.N. (2003) Particulate Filled Polymer Composites. 2nd Edition, Rapra Technology Limited, UK.

Copyright © 2024 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.