Hot-Wet Property Characterisation of a High-Temperature Cured Glass

Abstract

The hygrothermal diffusion and degradation behavior of a high-temperature cured glass–epoxy (Epoxy Novolac – EPN) composite system was studied under two environmental conditions (i.e. 323 K and 343 K immersion in distilled water). Samples immersed at 343 K showed higher diffusivity (Dc) value and lower saturation time (tm) than those of 323 K immersion while the maximum moisture content (Mm) remained the same, good Fickian correlation were observed for the composite system. As regards the degradative effects, the glass transition temperature (Tg) of the composite decreased with increased moisture content showing a maximum drop of 30 C at full saturation, while the mechanical properties (ILSS and IPS) of saturated specimens degraded upto 26 and 33% respectively. Further these mechanical properties obtained at 70 C/85%RH test condition showed good correlations with those predicted by a theoretical equation (Chamis et al. An Intergrated Theory for Predicting the Hydrothermo Mechanical Response of Advanced Composite Structural Components, Lewis Research Center, Cleveland, Ohio, NASA Technical Memorandum 73812).

Keywords

glass–epoxy composite resin transfer moulding (RTM)diffusivity maximum moisture content hot-wet property inter-laminar shear strength (ILSS)in-plane shear (IPS)glass transition temperature (Tg)

Get full access to this article

View all access options for this article.

References

1. Mathews, F.L. and Rawlings, R.D. (1994). Composite Materials: Engineering and Science, Woodhead Publishing Ltd., Cambridge, England.

2. Shen, C.H. and Springer, G.S. (Jan. 1976). Moisture Absorption and Desorption of Composite Materials, J. Composite Materials, 10: 2-2.

3. Bonniau, P. and Bunsell, A.F. (1981). A Comparative Study of Water Absorption Theories Applied to Glass Epoxy Composites, J. Composite Materials, 15: 272–293.

4. Srihari, Shylaja , Revathi, A. and Rao, R.M.V.G.K. (2002). Hygrothermal Effects on RT-cured Glass-Epoxy Composites in Immersion Environments, Parts A, Journal of Reinforced Plastics & Composites, 21(11): 983–993.

5. Lee, H. and Neville Longbottom, K. (1967). Handbook of Epoxy Resins, McGraw-Hill Book Company.

6. Sims, G.D. and Broughton, W.R. (2000). Glass-Fiber Reinforced Plastics-Properties, Comprehensive Composite Materials, Polymer Matrix Composites, Vol. 2, pp. 182–184, Pergamon, U.K.

7. Kelly, A. and Zweben, C. (2000). Comprehensive Composite Materials, In: Polymer Matrix Composites , Eds., Vol. 2, Pergamon, U.K.

8. Varma, I.K. and Gupta, V.B. (2000). Polymer Matrix Composites, In: Thermosetting Resins-Properties, Comprehensive Composite Materials, Vol. 2, pp. 12–14, Pergamon, U.K.

9. Srihari, Shylaja , Revathi, A. and Rao, R.M.V.G.K. (2002). Hygrothermal Effects on RT-Cured Glass-Epoxy Composites in Immersion Environments, Part B, Journal of Reinforced Plastics & Composites, 21: 994–1002.

10.

10. Pavan, R.M.V. , Saravanan, V. , Dinesh, A.R. , Rao, Y.J. , Srihari, Shylaja and Revathi, A. (2001). Hygrothermal Effects on Painted and Unpainted Glass/Epoxy Composites, Parts A & B, Journal of Reinforced Plastics & Composites, 20: 1048–1053.

11.

11. Padaki Naveen, V. , Vani, A. , Prakash, V. , Divakar, C.J. , Ananthkrishnan, T. and Rao, R.M.V.G.K. (2000). Studies on Impact Behavior of Knitted Glass/Epoxy Composites, Journal of Reinforced Plastics & Composites, 19(05): 396–402.

12.

12. Chamis, C.C. et al. An Intergrated Theory for Predicting the Hydrothermo Mechanical Response of Advanced Composite Structural Components, Lewis Research Center, Cleveland, Ohio, NASA Technical Memorandum 73812.

13.

13. Murthy, P.L.N. and Chamis, C.C. Simplified Design Procedures for Fiber Composite Structural Components/Joints, Lewis Research Center, Cleveland, Ohio, NASA Technical Memorandum 103113, N90-24384.

Hot-Wet Property Characterisation of a High-Temperature Cured Glass–Epoxy Composite in Immersion Environment

Abstract

Keywords

Get full access to this article

References