Effect of Fiber Diameter Waviness and Wavelength Ratio on the Effective Tensile Elastic Modulus of Carbon Nanotube-Based Polymer Composites

2009 ◽  
Vol 83-86 ◽  
pp. 473-480
Author(s):  
A.A. Khaled ◽  
A.K.M. Masud ◽  
S.C. Chowdhury ◽  
S. Jannat ◽  
M. Obayedullah
Keyword(s):  
Elastic Modulus ◽  
Carbon Nanotube ◽  
Polymer Composites ◽  
Polymer Composite ◽  
Volume Fraction ◽  
Fiber Diameter ◽  
Material Constant ◽  
Diameter Variation ◽  
Ratio Variation ◽  
Tensile Elastic Modulus

In this paper, the effects of nanotube diameter, waviness ratio and wavelength ratio on the tensile elastic modulus (TEM) of the carbon nanotube (CNT) reinforced polymer composites is investigated using a 3-D nanoscale representative volume element (RVE) based on continuum mechanics and using the finite element method (FEM). Formula to extract the effective material constant from solutions for the RVE under axial loading is derived based on the elasticity theory. Both long and short CNT embedded in the matrix are considered for investigating the effect of fiber diameter variation whereas only long wavy CNT is considered for investigating the effect of waviness and wavelength ratio variation, all at a volume fraction of 5%. First, the effects of CNT diameter on the TEM of the composite are investigated. Numerical results show that TEM of the polymer composite is influenced by tube diameter variation for both long and short CNT. Then the effects of waviness ratio and wavelength ratio on the TEM of polymer composite are investigated. Results show that both the waviness and wavelength ratio variation of CNT significantly influence the TEM of the polymer composite.

scholarly journals EFFECTS OF INTERPHASE AND MATRIX PROPERTIES ON EFFECTIVE TENSILE ELASTIC MODULUS OF CARBON NANOTUBE-BASED COMPOSITE

1970 ◽  
Vol 40 (1) ◽  
pp. 29-38 ◽  
Author(s):  
AKM Masud ◽  
Nabila Tahreen ◽  
Farhana Abedin
Keyword(s):  
Elastic Modulus ◽  
Carbon Nanotube ◽  
Elasticity Theory ◽  
Numerical Solutions ◽  
Volume Fraction ◽  
The Finite Element Method ◽  
Property Variation ◽  
Matrix Properties ◽  
Matrix Property ◽  
Tensile Elastic Modulus

The aim of this research is to assess the effects of interphase property and matrix property on the tensile elastic modulus (TEM) of the carbon nanotube (CNT) using a 3-D nanoscale representative volume element (RVE) based on continuum mechanics and using the finite element method (FEM). Formulas to extract the effective material constants from solutions for the RVE is derived based on the elasticity theory. Based on the strength of materials theory, an extended rule of mixtures, for estimating the effective Young's modulus, is applied for comparisons with the numerical solutions based on the elasticity theory. Both long and short CNT embedded in matrix at a volume fraction of 2% and 5% respectively is considered for investigating the effects of interphase and matrix property variation. The results demonstrate that in both the cases, matrix property and interphase property significantly influence the TEM of the CNT based composite. These results suggest that a coating of harder polymer on the CNT or a surface treatment can significantly increase the TEM of CNT based composite. Keywords: Carbon nanotube, Nanocomposites, Interphase, Tensile elastic modulus, FEM.   doi: 10.3329/jme.v40i1.3471   Journal of Mechanical Engineering, Vol. ME40, No. 1, June 2009 29-38

The influence of functionalization time of carbon nanotube on the mechanical properties of the epoxy composites

2017 ◽  
Vol 51 (12) ◽  
pp. 1693-1701 ◽  
Author(s):  
EA Zakharychev ◽  
EN Razov ◽  
Yu D Semchikov ◽  
NS Zakharycheva ◽  
MA Kabina
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Carbon Nanotube ◽  
Composite Materials ◽  
Polymer Composites ◽  
Epoxy Composites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This paper investigates the structure, length, and percentage of functional groups of multi-walled carbon nanotubes (CNT) depending on the time taken for functionalization in HNO3 and H2SO4 mixture. The carbon nanotube content and influence of functionalization time on mechanical properties of polymer composite materials based on epoxy matrix are studied. The extreme dependencies of mechanical properties of carbon nanotube functionalization time of polymer composites were established. The rise in tensile strength of obtained composites reaches 102% and elastic modulus reaches 227% as compared to that of unfilled polymer. The composites exhibited best mechanical properties by including carbon nanotube with 0.5 h functionalization time.

Electrothermomechanical Modeling and Analyses of Carbon Nanotube Polymer Composites

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
S. Xu ◽  
O. Rezvanian ◽  
M. A. Zikry
Keyword(s):  
Finite Element ◽  
Carbon Nanotube ◽  
Polymer Composites ◽  
Volume Fraction ◽  
Electron Tunneling ◽  
Three Dimensional ◽  
Fe Modeling ◽  
Aspect Ratios ◽  
Reinforced Polymer ◽  
Polymer Dispersions

A new finite element (FE) modeling method has been developed to investigate how the electrical-mechanical-thermal behavior of carbon nanotube (CNT)–reinforced polymer composites is affected by electron tunneling distances, volume fraction, and physically realistic tube aspect ratios. A representative CNT polymer composite conductive path was chosen from a percolation analysis to establish the three-dimensional (3D) computational finite-element (FE) approach. A specialized Maxwell FE formulation with a Fermi-based tunneling resistance was then used to obtain current density evolution for different CNT/polymer dispersions and tunneling distances. Analyses based on thermoelectrical and electrothermomechanical FE approaches were used to understand how CNT-epoxy composites behave under electrothermomechanical loading conditions.

Fiber Diameter-Dependent Elastic Deformation in Polymer Composites—A Numerical Study

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Nitin Garg ◽  
Gurudutt Chandrashekar ◽  
Farid Alisafaei ◽  
Chung-Souk Han
Keyword(s):  
Mechanical Behavior ◽  
Polymer Composites ◽  
Elastic Deformation ◽  
Volume Fraction ◽  
Fiber Diameter ◽  
Scale Effects ◽  
Numerical Study ◽  
Length Scale ◽  
Fiber Volume ◽  
Reinforced Polymer

Abstract Microbeam bending and nano-indentation experiments illustrate that length scale-dependent elastic deformation can be significant in polymers at micron and submicron length scales. Such length scale effects in polymers should also affect the mechanical behavior of reinforced polymer composites, as particle sizes or diameters of fibers are typically in the micron range. Corresponding experiments on particle-reinforced polymer composites have shown increased stiffening with decreasing particle size at the same volume fraction. To examine a possible linkage between the size effects in neat polymers and polymer composites, a numerical study is pursued here. Based on a couple stress elasticity theory, a finite element approach for plane strain problems is applied to predict the mechanical behavior of fiber-reinforced epoxy composite materials at micrometer length scale. Numerical results show significant changes in the stress fields and illustrate that with a constant fiber volume fraction, the effective elastic modulus increases with decreasing fiber diameter. These results exhibit similar tendencies as in mechanical experiments of particle-reinforced polymer composites.

Surface-Induced Polymer Crystallization in High Volume Fraction Aligned Carbon Nanotube-Polymer Composites

2010 ◽  
Vol 211 (9) ◽  
pp. 1003-1011 ◽  
Author(s):  
Shanju Zhang ◽  
Wei Lin ◽  
Xinfei Yu ◽  
Ching-Ping Wong ◽  
Stephen Z. D. Cheng ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Polymer Composites ◽  
Volume Fraction ◽  
High Volume ◽  
Polymer Crystallization ◽  
High Volume Fraction

Formation of Carbon Nanotube-Polymer Composites With Different Concentrations of Polystyrene Solution

2008 ◽  
Author(s):  
K. P. Yung ◽  
J. Wei ◽  
B. K. Tay
Keyword(s):  
Carbon Nanotube ◽  
Polymer Composites ◽  
Polymer Composite ◽  
Polymeric Material ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Conductive Filler ◽  
Surface Conductance ◽  
Polystyrene Solution

In this study, polystyrene was mixed with toluene by ratios of 1 wt%, 2 wt%, and 3 wt% to create polystyrene solutions. CNTs-polymer composites have been fabricated by introducing polymeric material into the CNT film grown by plasma enhanced chemical vapour deposition (PECVD). The nanotubes act as conductive filler to the composite and resulting in increases in surface conductivities. Depending on the concentration of the polystyrene solution, the increases in conductivity varied. It is shown that the surface conductance is lower for CNT-polymer composite with higher concentrated polystyrene solution.

Analysis of Coefficient of Thermal Expansion in Carbon Black Filled PDMS Composite

2020 ◽  
Vol 978 ◽  
pp. 237-244
Author(s):  
Hiremath Shivashankar ◽  
Rajole Sangamesh ◽  
S.M. Kulkarni
Keyword(s):  
Thermal Expansion ◽  
Carbon Black ◽  
Polymer Composites ◽  
Polymer Composite ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
Particle Packing ◽  
Fe Model ◽  
Percentage Increase ◽  
Circular Particle

Polymer composites are gaining attention due to their superior thermal properties. Especially carbon black /carbon nanotubes/ graphene filled polymer composites are used in energy harvesting, thermal actuators and MEMS. The coefficient of thermal expansion (CTE) is one of the most important properties in the polymer composite. In the present study, thermal expansion of polydimethylsiloxane (PDMS) matrix is filled with carbon black particle of varied volume fraction is modeled. Two-dimensional finite element (FE) model is computed in order to explain the thermal expansion behavior of the polymer composite and same is carried out for ambient to 70 K temperature. A 2D regular arrangement of circular particle packing model is set up and simulated. The FE model predicts that filler geometry has a little effect on the thermal expansion than the percentage of filler in the composite. Thermal expansion of composite is compared with the theoretical model. It shows that the CTE of composite reduces as the filler percentage increase, also gives good agreement in the both models. Hence, it is found that the addition of carbon black to the polymer composite could make it perform significantly better in thermal expansion.

Sign in / Sign up

Export Citation Format

Share Document