Finite element modelling of defective carbon nanotube reinforced polymer composites

Download
2019-8
Özel, Coşkun Kağan
Carbon nanotubes (CNTs) attract significant attention being one of the superior engineering materials that possess exceptional material properties. One of the uses of carbon nanotubes is as reinforcements in a polymer matrix to form Carbon Nanotube Reinforced Polymer (CNTRP) composites. CNTRPs are lightweight structures with enhanced mechanical properties due to CNT addition. It is well known that CNTs do not usually exist in perfect structural form. They possess defects such as vacancies or Stone-Wales (SW) defects. These defects have the potential to significantly affect the mechanical properties and thus the mechanical response of the CNT under loading conditions. This study aims to model various defective CNTs with different geometric and structural properties in order to investigate essential mechanical properties more realistically using nano-scale equivalent continuum modelling. Then, CNTRP composites are modelled that contain CNTs with defects. The developed CNTRP composite finite element models are then utilised to bring a more realistic insight into their properties and responses under mechanical load. First part of the study focuses on the investigation of single-walled carbon nanotubes (SWNTs) with Stone-Wales, mono-vacancy, di-vacancy, and combination of these defects. Zigzag and armchair configurations are considered with different diameters for the simulations. Results clearly show that defects may have significant effects on mechanical properties in the form of Young’s modulus, shear modulus and Poisson’s ratio. The second part of the thesis focuses on modelling of defective CNTRPs. The study on CNTRPs are carried out for 5% volume fraction of SWNTs. CNTRPs are modelled via continuum approaches. Results indicate that presence of defects can affect Young’s modulus and Poisson’s ratio adversely depending on diameter and chirality of tubes.

Suggestions

ESTIMATING THE EFFECT OF CHIRALITY AND SIZE ON THE MECHANICAL PROPERTIES OF CARBON NANOTUBES THROUGH FINITE ELEMENT MODELLING
Zuberi, Muhammad Jibran Shahzad; Esat, Volkan (2014-06-27)
Carbon nanotubes (CNTs) are considered to be one of the contemporary materials exhibiting superior mechanical, thermal and electrical properties. A new generation state-of-the-art composite material, carbon nanotube reinforced polymer (CNTRP), utilizes carbon nanotubes as the reinforcing fibre element. CNTRPs are highly promising composite materials possessing the potential to be used in various areas such as automotive, aerospace, defence, and energy sectors.
Meso-scale finite element modelling of carbon nanotube reinforced polymer composites
Haydar, Altay; Esat, Volkan; Mechanical Engineering (2021-12)
Carbon nanotube (CNT) reinforced polymer composites (CNTRPs) are promising materials which can be utilized in a variety of industries. Several experimental research studies have been conducted to determine the mechanical properties of CNTRPs, however results have not been conclusive. In this study, meso-scale representative volume elements (RVEs) of straight and coiled CNT (CCNT) reinforced epoxy composites were analysed by using commercial finite element analysis software MSC Marc-Mentat. CNTs were randoml...
Structural Vibration Analysis of Single Walled Carbon Nanotubes with Atom Vacancies
Dogan, Ibrahim Onur; Yazıcıoğlu, Yiğit (2014-11-01)
Recent investigations in nanotechnology show that carbon nanotubes have significant mechanical, electrical and optical properties. Interactions between those are also promising in both research and industrial fields. Those unique characteristics are mainly due to the atomistic structure of carbon nanotubes. In this paper, the structural effects of vacant atoms on single walled carbon nanotubes are investigated using matrix stiffness method. In order to use this technique, a linkage between structural mechan...
Modelling and analyis of multı-walled carbon nanotube reinforced polymer composites
Fatima, Bushra; Esat, Volkan; Sustainable Environment and Energy Systems (2016-8)
In this study, multi-walled carbon nanotubes (MWNTs) and multi walled carbon nanotube reinforced epoxy composites (CNTRPs) are investigated by means of computational modelling. To begin with, individual tubes of MWNTs are modelled with varying chiralities through equivalent continuum modelling in order to examine their essential mechanical properties including Young’s modulus, shear modulus, and Poisson’s ratio. The finite element models developed incorporate beam elements that represent Carbon-Carbon ...
Single-walled carbon nanotube based metamaterial absorber for solar cell application
Obaidullah, Madina; Sabah, Cumali; Esat, Volkan; Sustainable Environment and Energy Systems (2017-6)
Carbon nanotubes possess superior mechanical and electrical properties such as being lightweight, strong, and flexible; and having high electrical conductivity. Solar cells containing single-walled carbon nanotubes that absorb photons near infrared region have been a focal area of research and development due to their promising characteristics of harvesting light in the long wavelength region, cost effectiveness and performance. Absorption properties of SWNTs are not yet well studied quantitatively, even th...
Citation Formats
C. K. Özel, “Finite element modelling of defective carbon nanotube reinforced polymer composites,” M.S. - Master of Science, Middle East Technical University, 2019.