Mechanical properties of epoxy matrix composite reinforced with multi-walled carbon nanotubes

Download

index.pdf

Date

2019

Author

Yüceer, Kevser.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

188
views

103
downloads

Improving usage preference of composite material in the aerospace industry brings the requirement of improving mechanical properties of the material. In this thesis, mechanical improvement of epoxy composite materials is analyzed with contribution of functionalized multi-walled CNT with carboxyl group (-COOH) and non-functionalized MWCNT with epoxy for CNT weight fractions of 0.8, 1.0, 1.2, 1.5 and 2.0 wt%. The nanomaterial is dispersed in epoxy resin by calendering mixing method. Functionalization of CNT provides a good wetting of the reinforcement with epoxy matrix due to additional chemical bonding. The fracture toughness is measured using single-edge notch bending tests, flexural strength using three-point bending tests and tensile strength is measured by carrying out tensile tests. In addition, dynamic mechanical analysis is performed to characterize the material. The fracture toughness and storage modulus of reinforced composites are approximately the same with the base material. Fracture toughness is found not to increase for the weight fractions measured. The composites containing 1.5 wt% MWCNT-COOH and 1.2 wt% MWCNT exhibit increases in tensile strength by 20% and flexural strengths by 15%.

Subject Keywords

Composite construction., Keywords: Composite, Carbon Nanotubes, Calendering

URI

http://etd.lib.metu.edu.tr/upload/12625127/index.pdf
https://hdl.handle.net/11511/45539

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

MECHANICAL PROPERTIES OF REPAIRED CARBON FIBER REINFORCED POLYMER COMPOSITES Sonat, Emine Evren; Özerinç, Sezer; Department of Mechanical Engineering (2021-12-10) Carbon fiber reinforced polymer (CFRP) composites are increasingly used in the aerospace industry due to their high specific strength compared to conventional metallic materials. However, a significant shortcoming of these composites is their increased susceptibility to damage. Structural repair is a common method to restore the load-carrying capacity of a damaged part when the damage size exceeds the pre-defined tolerances. Scarf and stepped bonded repair methods are the primary choice for cases that requi...
Interlaminar tensile strength of different angle-ply CFRP composites Yavuz, Burak Ogun; Parnas, Levend; Çöker, Demirkan (Elsevier BV; 2019-01-01) Due to high specific strength and modulus requirements, demand for the use of polymer-based composites in structural applications has been increasing more than ever. On the other hand, their interlaminar properties are known to be relatively weak. Such structures are prone to interlaminar failures including delaminations under static or impact loads. Interlaminar tensile strength (ILTS) is one of the interlaminar properties which gives an indication of delamination onset in through the thickness loading for...
Mechanical, electrical and thermal properties of carbon fiber reinforced poly(dimethylsiloxane)/polypyrrole composites Cakmak, G; Kucukyavuz, Z; Kucukyavuz, S; Cakmak, H (2004-01-01) Conductive and flexible carbon fiber (CF) reinforced polydimethylsiloxane (PDMS)/polypyrrole (PPy) composites were synthesized electrochemically. Electrochemical synthesis was performed at + 1.1 V using p-toluenesulfonic acid as supporting electrolyte and water as solvent. Composites were characterized by thermal gravimetric analysis, scanning electron microscopy (SEM), conductivity measurements and mechanical tests. Conductivities of composites were observed in the range of 2.2-4 S/cm. SEM studies show tha...
Numerical investigation of stiffened composite panel into buckling and post buckling under combined loading Akay, Erkan; Yaman, Yavuz; Department of Aerospace Engineering (2015) This thesis presents the investigation of buckling and post buckling behaviour of stiffened thin walled laminated composite aerospace structures subjected to combined in-plane axial and shear loadings. Due to the fact that the state of stress developing especially in the post-buckling stage is quite complicated under the combined loading, the necessary computational model is usually based on Finite Element Modelling (FEM). In this study, after verifying the FEM methodology and completing the sensitivity stu...
Electrical transport, optical and thermal properties of polyaniline-pumice composites YILMAZ, KORAY; Akgoz, A.; Cabuk, M.; Karaagac, H.; KARABULUT, ORHAN; YAVUZ, Mustafa (2011-11-01) In this study, electrical conductivity, photoconductivity, absorbance and thermal properties of polyaniline (PANI) and polyaniline-pumice composites were investigated. Temperature dependent conductivity and photoconductivity measurements were carried out in the temperature range of 80-400K. The measurements revealed that the dominant conduction mechanisms in polyaniline and 15% pumice doped composite were hopping conduction. The low activation energies calculated for 36% pumice doped composite indicated tha...

Citation Formats

K. Yüceer, “Mechanical properties of epoxy matrix composite reinforced with multi-walled carbon nanotubes,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Aerospace Engineering., Middle East Technical University, 2019.