Effects of Hydrothermal Ageing on the Microbond Interfacial Shear Strength of NaOH Treated Sisal Fibre Reinforced Polyester Composites

Chizyuka G Chizyuka; Shamitiba B Kanyanga; Grain M Munakaampe

doi:10.53974/unza.jonas.2.1.370

Chizyuka G Chizyuka University of Zambia, School of Engineering, Department of Mechanical Engineering
Shamitiba B Kanyanga University of Zambia, School of Engineering, Department of Mechanical Engineering
Grain M Munakaampe University of Zambia, School of Engineering, Department of Mechanical Engineering

DOI: https://doi.org/10.53974/unza.jonas.2.1.370

Keywords: Microbond Interfacial Shear Strength, Natural Fibre-Reinforced Composite, Service Environment, Hydrothermal Effects, Fractographic Analyses, Debonding

Abstract

Engineering structural failures can be related to the fracture of one or more of the constituent materials that form a composite. Such failures often occur unpredictably and suddenly. It is, therefore, necessary to minimise undesired failures and their consequences when designing and analysing modern-day structures. To suitably design structural components, not only do the fundamental mechanical properties of the components’ material constituents need to be known, but also the effects of the service environment on these properties. Moisture is one critical environmental factor that can be destructive to properties of composite materials. Composite constituent components, most especially in natural fibre- reinforced composites constantly absorb or desorb moisture due to varying temperature and relative humidity levels in their service environment. In this regard, this paper presents results of a study on the influence of hydrothermal effects on the composite material microbond interfacial shear strength as a function of ageing period under different thermal loading states. Results from the microbond test coupled with Scanning Electron Microscope (SEM) fractographic analyses indicate that debonding is an established fracture mechanism in this hydrothermally aged NaOH treated sisal fibrepolyester composite systems.

Author Biography

Chizyuka G Chizyuka, University of Zambia, School of Engineering, Department of Mechanical Engineering

Department of Mechanical Engineering School of Engineering University of Zambia

References

1. Bhandakkar A., Kumar N., Sastry, S.M.L. (2014) “Interlaminar Fracture Toughness of Epoxy Glass Fibre Fly Ash Laminate Composite.” Material Science and Applications5:231-244.
2. Bledzki, A. K., Sperber, V. E., & Faruk, O.(2002). Natural and Wood Fibre Reinforcement in Polymers. Rapra Review Report, Rapra Technology Ltd. 13: 144.
3. Chand, N., Tiwary, R. K., & Rohatgi, P. K. (1988). "Bibliography Resource Structure Properties of Natural Fibres –An Annotates Bibliography." International Journal of Material Science 23: 381 –387.
4. Chizyuka, C.G and Kanyanga, S.B. (2013). "Effects of Hydrothermal Ageing on the Fracture Damage of Sisal Fibre Reinforced Polyester Composites." The Zambian Engineer 46(1): 11 -19.
5. Craven, J. P., Cripps, R., & Viney, C. (2000). "Evaluating the Silk/Epoxy Interfaceby means of the Microbond Test." Composites Part A(31): 653 –660.
6. Gaur, U. and Miller, B. (1990). "Effects of Environmental Exposure on Fibre/Epoxy Interfacial Shear Strength." 11(4): 217 -222.
7. Gautier, L., Mortaigne, B., & Bellenger, V. (1999). "Interface Damage Study of Hydrothermally Aged Glass-Fibre-Reinforced Polyester Composites." Composite Science and Technology 59(16): 2329 -2337.
8. Geo, Y. C. and Cotterell, B. (1988). "Fracture of Fibre-Reinforced Materials." ZAMP(Journal of Applied Mathematics and Physics) 39: 550 -572."Future Fibres". [Online]. Available: http://www.fao.org/economic/futurefibres/fibres/sisal/en/ . [Accessed on 2-11-2015]
9. Kim, J. K. and Mai, Y. W., Eds. (1998). Engineered Interfaces in Fibre Reinforced Composites. Oxford, Elsevier Science Ltd.
10. Li, Y., Mai, Y. W., Ye, L. (2000). Microstructure and Mechanical Properties of Sisal Fibre and Adhesion to Vinyl Ester Resin. Proceedings of the 9th European Conference on Composite Materials (ECCM-9), Brighton, UK, IOM Communications Ltd, London.
11. Luyt, A. S. and Malunka, M. E. (2005). "Composites of Low-Density Polyethylene and Short Sisal Fibres: The Effect of Wax Addition and Peroxid Treatment on the Thermal Properties." Thermochimica Acta 426: 101 –107.
12. Miller, B., Muri, P., & Rebenfeld, L. (1987). "A Microbond Method for Determination of the Shear Strength of a Fibre/Resin Interface." 28(1): 17 -32.
13. Oikonomou, A. 2010. "Composite Micromechanics of Flax Fibres and Poly(L-lactic acid) Microdroplets." (a MPhil Thesis), University of Manchester, Manchester, 2010.
14. Pai, S and Chandra, R.Y. (2013). "Analysis of Polyester Fibre-Reinforced Concrete Subjected to Elevated Temperatures." International Journal of Civil, Structural, Environmental and Infrastructural Engineering Research and Development 3(1): 1 -10.
15. Rong, M. Z., Zhang, M. Q., Yang, g. C. & Zeng, H. M. (2001). "Treatment on the Mechanical Propertie of Unidirectional Sisal Reinforced Epoxy Composites." Composite Science Technology 61: 1437 –1447.
16. Rosato, D. V., Rosato, D. V., & Rosato, M. V. (2004). Plastic Product Material and Process Selection Handbook. Oxford, Elsevier Science & Technology Books.
17. Samuel, O.S., Agbo, S., Adekanye,T.A. (2012). "Assessing Mechanical Properies of Natural Fibres Reinforced Composites for Engineering Applications." Journal of Mineral and Minerals Characterisation and Engineering 11:780 -784.
18. Seni, M. I. B (2007). "The Study of Mechanical properties and Microstructure of Thermal-Curing Process on Natural Fiber (Kenaf) Reinforced Thermoset Composite". Melaka: Technical University of Malaysia.
19. Sreekala, M. S. and Thomas, S. (2003). "Effects of Fibre Surface Modification on Water-Sorption Characteristics of Oil Palm Fibres." Composite Science Technology 63: 861 –869.
20. Thais, H. D., S. M. Sydenstricker,S. M., & Sandro, C. A. (2003). "Pull-out and other Evaluations in Sisal Reinforced Polyester Biocomposites." Polymer Testing 22: 375 –380.
21. Thomason, J. L. and Schoolenberg, G. E. (1994). "An Investigation of Glass Fibre/Polypropylene Interface Strengthand its Effect on Composite Properties." Composites 25(3): 197 -203.
22. Valadez-Gonzalez, A., Cervantes, J. M., Olayo, R. & Herrera-Franco, P. J. (1999). "Effects of Fibre Surface Treatment on Fibre-Matrix Bond Strength of Natural Fibre Reinforced Composites." Composites 30: 300 –320.
23. Yang, L. and Thomason, J. L. (2010). "Interface Strength in Glass Fibre–Polypropylene Measured using the Fibre Pull-Out and Microbond Methods." Composites Part A(41): 1077 –1083.
24. Zhandarov, S. and Mader, E. (2005). "Characterization of fibre/matrix interface strength: applicability of different tests, approaches and parameters." Composite Science and Technology 65: 149 -160.