An experimental study on the nonlinear free vibration response of epoxy and carbon fiber-reinforced composite containing single-walled carbon nanotubes

Abstract

In this paper, the effects of additives of a single-walled carbon nanotube (SWCNT) on the nonlinear free vibration of neat resin and carbon fiber reinforced polymer composites (CFRPs) are investigated experimentally. To establish this purpose a sensitive noncontact setup is designed and prepared. In order to obtain a proper SWCNT dispersion pattern, a simple multistage method is presented to fabricate and test nanocomposite beams. First, the increase in the Young's modulus of the nanocomposites by adding carbon nanotube is investigated using the mechanical bending test and validated with available test results. Next, the nonlinear free vibration behavior of cantilever beams under small to large-deflection is investigated. The results of the vibration tests indicate that the nonlinear vibration behavior of all models is close to homogenous materials with increasing SWCNT. The results also show that transverse initial excitation (displacement) imposed an axial load on the slender beams, which thus leads to an increase in the nonlinear frequency of oscillation. In addition, the increase in frequency bears a relation to the initial displacement. Also, large initial displacements, especially on models without carbon fiber (reinforced epoxy), cause that the convergence of frequencies under different initial excitation did not occur. The results of this study show that adding SWCNT can lead to convergences of frequencies’ hybrid composites and reinforced epoxy during final cycles.

Construct the Character Table of D7h Point Group and Apply it for Classify the (3N-6) Modes of Vibration for the [7] Cyclacene (Linear) Monoring Molecule

“…10, pp: ------ The arrow in the center of the molecule indicates the direction of the dipole moment of the active mode of vibration in the infrared spectrum]. And similarly to the single wall carbon nanotubes (SWCNs) [18,[23][24][25][26], the calculations of electronic charge for [7] Science, 2019, Vol. 60, No.…”

Processing, manufacturing, and characterization of vibration damping in epoxy composites modified with graphene nanoplatelets

“…Some studies on damping and experimental vibration of polymer nanocomposites reinforced with carbon nanomaterials have been published. Analytical models on vibration and damping of two‐phase and three‐phase carbon nanotubes‐reinforced composite structures have been proposed by several researchers. For instance, Rafiee et al proposed mathematical models for effective material properties of multiscale polymer nanocomposites reinforced with carbon nanotubes and graphene .…”

“…Experimental investigation of vibration and damping in epoxy nanocomposite structures are limited to carbon nanotubes. Both two‐phase and three‐phase CNTs‐reinforced nanocomposites were investigated experimentally. For instance, the free and forced vibration tests were performed by Khan et al to study the vibration damping of CNTs‐reinforced carbon fiber reinforced polymer composites.…”

Fabrication and experimental evaluation of vibration and damping in multiscale graphene/fiberglass/epoxy composites

“…Some studies on dynamical modeling 7,9-11 and experimental investigations 4,5,[12][13][14][15][16][17][18][19][20][21][22] of polymer nanocomposites reinforced with carbon nanomaterials have been published. The vibration and damping characterization of two-phase 12,[14][15][16] and three-phase [17][18][19]23 nanocomposites modified with MWCNTs were investigated experimentally. For instance, the free and forced vibration tests were performed by Khan et al 18 to study the vibration damping of CNT-reinforced carbon fiberreinforced polymer composites.…”

“…Further increasing the concentration of MWCNTs led to significant improvement in damping ratio and reduction in natural frequency. Mathematical models of vibration and damping of two-phase [13][14][15][16][17] and three-phase [16][17][18][19][20] CNTs-reinforced composite structures have also been proposed. For instance, Rafiee et al 1,2,24 proposed mathematical models for effective material properties of multiscale polymer nanocomposites reinforced with CNTs and graphene.…”