Dynamic Characteristics of Functionalized Carbon Nanotube Reinforced Epoxy Composites: An Experimental Approach
محورهای موضوعی : Mechanical Engineering
S. M. Hosseini Farrash
1
(
Faculty of Mechanical and Mechatronics Engineering, Shahrood University of Technology, Shahrood, Iran
)
M Shariati
2
(
Nanomechanics Lab, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
)
J Rezaeepazhand
3
(
Smart and Composite Structures Lab, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
)
کلید واژه: Scanning Electron Microscopy, Vibrational properties, nanocomposite, Amine functionalization,
چکیده مقاله :
The effects of amine functionalization of carbon nanotubes (CNTs) and CNTs weight percent (wt. %), on the first bending natural frequencies and damping properties of CNT/epoxy composites are investigated in this paper. CNTs and amine functionalized CNTs (AFCNTs), with two different weight percentages, are used to manufacture the beam shaped specimens. Epoxy, CNT/epoxy (0.25 and 0.5 wt. % of CNTs) and AFCNT/epoxy (0.25 and 0.5 wt. % of AFCNTs) were fabricated. Experimental vibrational test is utilized in order to study the free vibration behavior of specimens under clamped-free boundary conditions. Natural frequencies and damping ratios are extracted from the experimental time response graphs. Results indicated that adding AFCNTs (0.5 wt. %) into the matrix material has the most effect on the natural frequency of the beam. In this case, the damping ratio has the lowest value. Moreover, scanning electron microscopy (SEM) images of the fracture surface of the specimens are prepared. The images illustrate that amine functionalization of CNTs leads to better dispersion of CNTs into the epoxy matrix. Further, it can be observed that enhancement in the value of damping ratio is more dominant than enhancement in stiffness value by dispersing AFCNTs into the epoxy resin.
[1] Iijima S., 1991, Helical microtubules of graphitic carbon, Nature 354(6348): 56-58.
[2] Her S.C., Yeh S.W., 2012, Fabrication and characterization of the composites reinforced with multi-walled carbon nanotubes, Journal of Nanosci and Nanotechnol 12(10): 8110-8115.
[3] Farrash S.M.H., Shariati M., Rezaeepazhand J., 2018, Experimantal study on the effect of amine functionalized carbon nanotubes on the thermomechanical properties of CNT/Epoxy nanocomposites, Mechanics of Advanced Composite Structures 5(1): 41-48.
[4] Sharma K., Shukla M., 2014, Three-phase carbon fiber amine functionalized carbon nanotubes epoxy composite: processing, characterisation, and multiscale modeling, Nanomater 2014: 1-10.
[5] Ma P.C., Mo S.Y., Tang B.Z., Kim J.K., 2010, Dispersion, interfacial interaction and re-agglomeration of functionalized carbon nanotubes in epoxy composites, Carbon 48(6): 1824-1834.
[6] Banks-Sills L., Shiber D.G., Fourman V., Eliasi R., Shlayer A., 2016, Experimental determination of mechanical properties of PMMA reinforced with functionalized CNTs, Composites Part B 95: 335-345.
[7] Cha J., Kim J., Ryu S., Hong S.H., 2019, Comparision to mechanical properties of epoxy nanocomposites reinforced by functionalized carbon nanotubes and graghene nanoplatelets, Composites Part B 162: 283-288.
[8] Cha J., Jun G.H., Park J.K., Kim J.C., Ryu H.J., Hong S.H., 2017, Improvement of modulus, strength and fracture toughness of CNT/Epoxy nanocomposites through the functionalization of carbon nanotubes, Composites Part B 129: 169-179.
[9] Fang F., Ran S., Fang Z., Song P., Wang H., 2019, Improved flame resistance and thermo-mechanical properties of epoxy resin nanocomposites from functionalized graphene oxide via self-assembly in water, Composites Part B 165: 406-416.
[10] Pokharel P., Pant B., Pokhrel K., Pant H.R., Lim J., Lee D.S., Kim H.Y., Choi S., 2015, Effects of functional groups on the graphene sheet for improving the thermomechanical properties of polyurethane nanocomposites, Composites Part B 78: 192-201.
[11] Marin M., 1996, Generalized solutions in elasticity of micropolar bodies with voids, Revista de la Academia Canaria de Ciencias 8(1):101-106.
[12] Marin M., 1999, An evolutionary equation in thermoelasticity of dipolar bodies, Journal of Mathematical Physics 40(3): 1391-1399.
[13] Farrash S.M.H., Shariati M., Rezaeepazhand J., 2017, The effect of carbon nanotube dispersion on the dynamic characteristics of unidirectional hybrid composites: An experimental approach, Composites Part B 122: 1-8.
[14] Alva A., Raja S., 2011, Dynamic characteristics of epoxy hybrid nanocomposites, Journal of Reinforced Plastics and Composites 30(22): 1857-1867.
[15] Rajoria H., Jalili N., 2005, Passive vibration damping enhancement using carbon nanotube-epoxy reinforced composites, Composites Science and Technology 65(14): 2079-2093.
[16] Her S.C., Lai C.Y., 2013, Dynamic behavior of nanocomposites reinforced with multi-walled carbon nanotubes (MWCNTs), Materials 6(6): 2274-2284.
[17] Alva A., Raja S., 2014, Damping characteristics of epoxy-reinforced composite with multiwall carbon nanotubes, Mechanics of Advanced Composite Structures 21(3): 197-206.
[18] Jangam S., Raja S., Gowd B.U.M., 2016, Influence of multiwall carbon nanotube alignment on vibration damping of nanocomposites, Journal of Reinforced Plastics and Composites 35(8): 617-627.
[19] Marin M., 1998, Contributions on uniqueness in thermoelastodynamics on bodies with voids, Ciencias Matemáticas 16(2): 101-109.
[20] Rao S.S., 2011, Mechanical Vibration, University of Miami, Prentice Hall.
[21] He J., Fu Z.F., 2001, Modal Analysis, Oxford, Butterworth-Heinemann.
[22] Heracovich C.T., 1998, Mechanics of Fibrous Composites, John Wiley and Sons, New York.
