Structure and Properties of SWCNT-Modified CFRP

Structure and mechanical properties of CFRP modified by SWCNT with different content (0.1, 0.2 and 0.3 wt. %) have been studied in the present paper. The structural investigations include SEM imaging while the mechanical properties have been characterized via tensile and flexural tests. The main functional feature of such hybrid composite is an electrical conductivity, which has been also measured. Out-of-plane conductivity has been enhanced up to ~66 S/m from dielectric unmodified CFRP. It has been shown that tensile properties stay almost unchanged, while flexural strength and modulus have increased by 22% and 16% correspondingly

Investigation of the Structure and Properties of SWCNT-Modified Epoxy Specimens

SWCNT-modified epoxy with advanced electrical properties was investigated in the paper. CFRPs have high specific strength and elastic modulus which are the most important properties for aerospace engineering. However a lack of electrical and heat conductivity makes efficient lightning strike protection and thermal de-icing complicated. In this research electric conductivity of epoxy binder for CFRP production is modified by addition of single-wall carbon nanotubes. Measurements of electrical conductivity of hardened epoxy binders are performed showing good increase of conductive properties

Thermogravimetric analysis of epoxy-based carbon fiber reinforced polymers modified by carbon fillers

The paper presents the results of thermogravimetric/differential scanning calorimetry investigation of hybrid thermoset CFRPs modified by the addition of single-wall carbon nanotubes and milled carbon fibers. Specimens were tested using NETZSCH STA 409 PC/PG with the following parameters: heating from ambient temperature to 873 K with a rate of 15 K/min; Ar flow rate of 50 ml/min. The content of the carbon filler in CFRP was varied allowing to establish some regularities in thermal and physical properties

Flexural properties of copper-filled carbon fiber reinforced polymers

The paper demonstrates the results of flexural tests of carbon fiber reinforced polymers with the addition of copper microfillers with content varying from 2.5 to 10 wt%. It is shown that the implemented dispersive reinforcement leads to the increase of flexural strength on composites by 9%, while the elastic modulus remains the same. The reasons for the advancement in mechanical properties are discussed

Flexural properties of copper-filled carbon fiber reinforced polymers

The paper demonstrates the results of flexural tests of carbon fiber reinforced polymers with the addition of copper microfillers with content varying from 2.5 to 10 wt%. It is shown that the implemented dispersive reinforcement leads to the increase of flexural strength on composites by 9%, while the elastic modulus remains the same. The reasons for the advancement in mechanical properties are discussed

Fatigue behaviour of CG and UFG titanium: DIC and fractography studies

The manuscript is devoted to the investigation of fatigue behaviour of coursegrain (CG) and ultrafine-grain (UFG) titanium grade 2 by means of digital image correlation (DIC) and scanning electron microscopic fractography. The UFG state has been obtained utilizing severe plastic deformation technique. The results show that the high amount of defects (grain boundaries, dislocations, etc.) in UFG suppress plastic deformation and leads to earlier crack initiation, however at the macrocrack growth stage these impurities are obstacles for transgranular mechanism of fracture

Evaluation of elastic modulus of carbon fiber reinforced polymers using an optical extensometer

The paper presents the results of application of different techniques for processing of digital image correlation data. The algorithms are described and applied for determination of elasticity modulus of carbon fiber reinforced polymer specimens tested by uniaxial tension. Two ways of evaluation of elongation along with two methods of elastic modulus calculation resulted in four techniques which have shown quite similar results with a scatter of 0.5-2%