The Tensile Fatigue Behaviour of Aligned MWNT/Epoxy Nanocomposites
The emergence of carbon nanotubes (CNTs) has created new opportunities for the fabrication of polymer composites that possess strong potential for a wide spectrum of applications. The one-dimensional structure of carbon nanotubes has a very high anisotropic nature and unusual mechanical properties, which made them as promising nanofiller for the composite structures. But the particle-level exceptional properties are not completely utilised when they are used as reinforcement in composites due to inadequate and immature processing techniques. In the present work, we have made an attempt to utilise the strong anisotropic nature of multi-walled carbon nanotubes (MWNTs) for improving the fatigue life of nanocomposites, especially for very low weight percentages. The MWNTs anisotropy was imparted to the nanocomposites by aligning them in the epoxy matrix with DC electric field during curing. Nanocomposites were made for 0.1 wt% MWNT loading. Totally, three categories of nanocomposites were prepared: nanocomposites with aligned CNT (with electric field), nanocomposites without CNT alignment (without electric field), and neat epoxy for the comparison purpose. The tensile fatigue behaviour was investigated under stress control mode by applying cyclic sinusoidal load with the frequency range of 1–3 Hz and stress ratio of R = 0.1. The specimens were tested for the fatigue load until the failure or 1E+05 cycles. The fractured surfaces were examined through scanning electron microscope to analyse the fatigue fracture behaviour.
KeywordsMulti-walled carbon nanotubes (MWNTs) Nanocomposites Fatigue Nanotube alignment Digital image correlation (DIC) Toughening mechanisms
The authors would like to acknowledge the financial support received from the 12th Five Year Plan of Council of Scientific and Industrial Research (CSIR), India (Project No. ESC-02-12-02).
- 4.Coleman JN, Khan U, Blau WJ, Gun’ko YK (2006) Small but strong: a review of the mechanical properties of carbon nanotube-polymer composites. Carbon N Y 44(9):1624–1652Google Scholar
- 5.Wernik JM, Meguid SA (2010) Recent developments in multifunctional nanocomposites using carbon nanotubes. Appl Mech Rev 63(5):050801Google Scholar
- 9.Sengezer EC, Seidel GD, Bodnar RJ (2015) Phenomenological characterization of fabrication of aligned pristine-SWNT and COOH-SWNT nanocomposites via dielectrophoresis under AC electric field. Polym Compos 1266–1279Google Scholar
- 13.Qiu L, Wang X, Su G, Tang D, Zhe X, Zhu J (2016) Remarkably enhanced thermal transport based on a flexible horizontally-aligned carbon nanotube array film. Nature Scientific ReportsGoogle Scholar
- 17.Manjunatha CM, Taylor AC, Kinloch AJ, Sprenger S (2009) The cyclic-fatigue behaviour of an epoxy polymer modified with micron-rubber and nano-silica particles. J Mater Sci 44(16):4487–4490Google Scholar
- 18.Parvaneh V, Shariati M (2015) Experimental analysis of the low cycle fatigue of a spray-coated layered multi-walled carbon nanotubes/polyvinyl chloride nanocomposite. J Compos Mater 0(0):1–8Google Scholar
- 19.Jangam S, Raja S, Maheswar Gowd BU (2016) Influence of multiwall carbon nanotube alignment on vibration damping of nanocomposites. J Reinf Plast Compos 35(8):617–627Google Scholar
- 20.Rao S (2008) An emerging, energy-efficient cure process for rapid composite manufacture. In: International conference on aerospace science and technology, Bangalore, IndiaGoogle Scholar
- 21.American Society for Testing and Materials (2014) Standard test method for tensile properties of plastics, ASTM D638-14, Annual book of ASTM Standards, vol 8.01. American Society for Testing and Materials, PA, USAGoogle Scholar