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

Yüceer, Kevser.
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%.


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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...
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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...
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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...
Production and characterization of aluminum matrix composites for small-scale unmanned aircraft engine pistons
Demiralp, Muammer; Kalkanlı, Ali; Department of Metallurgical and Materials Engineering (2020)
The composite materials are used in every stage in life, from the aerospace industry to agriculture. In most composites, the primary purpose of adding reinforcement to the matrix material is to increase the strength and stiffness of the matrix. Nowadays, most engineering materials are replaced with the composite materials due to higher specific strength. In this study, particle reinforced metal matrix composite is used to produce pistons for a small-scale unmanned aircraft engine. Conventional pistons are p...
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.