AN EXPERIMENTAL INVESTIGATION ON THE CHARPY IMPACT RESPONSE OF GLASS/EPOXY COMPOSITES AGED IN SEAWATER
Abstract
This study highlights the influence of seawater absorption on Charpy impact properties of glass/epoxy composites. For this study, two groups of glass/epoxy composites that were produced by using vacuum infusion method were immersed in seawater at 25°C and 70°C temperatures and one group was immersed any condition. Specimens were keep in water until getting saturation point. The immersed specimens reached saturation at the end of sixth weeks (1000 h). Charpy impact test (having 15 J impact capacity) were conducted three groups that are dry samples, saturated samples and re-dried samples after saturation. From the Charpy impact test result it was observed that impact properties degradation occured due to hydrothermal aging. Compared to their non-immersed state, maximum impact stress energy of immersed specimen have dropped seriously, regardless of temperature. Also, as temperature increased, the reduction rate of maximum impact stress energy increased. Similar results occured at re-dried group. That is the decrease rate in aged samples at 25°C is 27.3%, whereas this rate is 30.03% in aged samples at 70°C. However, when compared to their dry state, the decrease in maximum impact stress in the re-dried group is considereably lower than in the satureted group. The decrease rate in re-dried samples aged samples at 25°C is 2.6%, whereas this rate is 7.77% in re-dried samples aged at 70°C.
Keywords
Supporting Institution
Gaziantep University Scientific Research Project Governing Unit (BAPYB)
Project Number
MF.DT.19.08
References
- 1. Atas, C., Dogan, A. An experimental investigation on the repeated impact response of glass/epoxy composites subjected to thermal ageing. Composites Part B, 2015, 75: 127-134.
- 2. Bradley, W.L., Grant, T.S. The effect of the moisture absorption on the interfacial strength of polymeric matrix composites. Journal of Materials Science, 1995, 30: 5537-5542.
- 3. Ellyin, F., Rohrbacher, F. Effect of aqueous environment and temperature on glass-fibre epoxy resin composites. Journal of Reinforced plastics and composites, 2000, 19(17):1405-1427.
- 4. Aktas A., Uzun I. Sea water effect on pinned-joint glass fibre composite materials, Composite Structures, 2008, 85(1): 59-63.
- 5. Catherine, A., Bradley, W.L. Determination of the effect of seawater on the interfacial strength of an interlayer E- glass/graphite/epoxy composite by in situ observation of transverse cracking in an environmental SEM. Composite Science and Technology, 1997, 57(8): 1033-1043.
- 6. Ray, B.C. Temperature effect during humid ageing on interfaces of glass and carbon fibres reinforced epoxy composites. Journal of Colloid and Interface Science, 2006, 298(1): 111-117.
- 7. Chakraverty, A.P., Mohanty, U.K., Biswal, B.B. Thermal shock behaviour of hydrothermally conditioned e-glass fiber/epoxy composite. Material Research, 2012, 1(5): 263-270.
- 8. Rutowska, M., Krasowska, K., Heimwoska, A., Steinka, E. and Janik, H. Degradation of polyurethanes in sea water. Polym. Degrad. Stab., 2002, 76, 233-239.
- 9. Mourad, A.I., Abdel-Magid, B.M., EI-Maaddawy, T. and Grami, M.E. Effect of Seawater and Warm Environment on Glass/Epoxy and Glass/polyurethane Composites. Applied Composite Material, 2010, 17(5): 557-573.
- 10. Hawa, A., Abdul Majid, M.S., Afendi, M., Marzuki, H.F.A., Amin, N.A.M., Mat, F., Gibson, A.G. Burst strength and impact behaviour of hydrothermally aged glass fibre/epoxy composite pipes. Mater Des 2015, 89(5):455–464.
