Improving Fatigue Performance of GFRP Composite Using Carbon Nanotubes

Genedy, Moneeb; Daghash, Sherif M.; Soliman, Eslam; Taha, Mahmoud Reda

doi:10.3390/fib3010013

Cited by 37 publications

(13 citation statements)

References 41 publications

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“…The peaks at 1044 and 2930 cm -1 were considered to the effect of p-TSA as a surfactant dopant and corresponded to the SO 3-group of p-TSA and the stretching vibration methyl(-CH3) group, respectively [16]. The peak near 3300 cm -1 attributed to epoxy OH [20] and stretching NH [16][17][18] too that have been almost together. OH peak in all samples are available and with the increase of carbon intensity increases that it represents the link between the nanotubes and the epoxy.…”

Section: Resultsmentioning

confidence: 99%

Effect of in-situ oxidative preparation on electrical properties of Epoxy/PANi/MWCNTs nanocomposites

Imani

Arabi

Farzi

2016

J Mater Sci: Mater Electron

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Conductive adhesives based on Epoxy/Polyaniline/MWCNT (EPM) system doped with Paratoluensulfonic acid (p-TSA) have been successfully synthesis via different methods and characterized. The composites were prepared by in situ synthesis of aniline/MWCNTs within epoxy matrix and direct physical mixing. X-ray diffraction (XRD) spectrum established the existence of MWCNT in the structure and showed that the morphology of samples was amorphous. FT-IR results confirmed that the composites were successfully synthesis and there is strong coupling between the PANi and MWCNT. The microstructure of the conductive adhesives was considered by field emission scanning electron microscopy. The in situ technique contributes for the development of a conducting path with lower amount of PANi/p-TSA. Electrical properties as a function of PANi and MWCNTs contents have also indicated a great interaction between polyaniline, MWCNT and epoxy matrix by in situ polymerization procedure.

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Section: Resultsmentioning

confidence: 99%

Effect of in-situ oxidative preparation on electrical properties of Epoxy/PANi/MWCNTs nanocomposites

Imani

Arabi

Farzi

2016

J Mater Sci: Mater Electron

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“…Axial stiffness ratios are presented in Table 4. Failure modes of the GFRP specimens were described per ASTM D3039 [32] as explosive failure in the gauge area in the middle location (XGM) for 0 • fiber orientation specimens, which represented typical broom-like failure due to the weak interfacial bond between glass fibers and the thermoplastic matrix [41,42]. Lateral failure in the gauge area in the middle location (LGM) was observed for 45 • fiber orientation specimens showing fiber rupture in multiple superimposed ±45 • angled planes.…”

Section: Resultsmentioning

confidence: 99%

3D-Printed Pseudo Ductile Fiber-Reinforced Polymer (FRP) Composite Using Discrete Fiber Orientations

Vemuganti

Soliman

Taha

2020

Fibers

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The use of fiber-reinforced polymer (FRP) composite materials are continuously growing in civil infrastructure due to their high strength, low weight, and manufacturing flexibility. However, FRP is characterized by sudden failure and lacks ductility. When used in construction, gradual failure of FRP components is desired to avoid catastrophic structural collapse. Due to its mechanical orthotropy, the behavior of FRP relies significantly on fiber orientation and stacking sequence. In this paper, a novel multi-angled glass fiber reinforced polymer (GFRP) composite laminate showing pseudo ductile behavior is produced using 3D-printing. This is accomplished by varying fiber orientation angles, stacking sequence, and thickness of lamina. Single-angled GFRP composite specimens were 3D-printed with different fiber orientation angles of 0°, 12°, 24°, 30°, 45°, and 90° using continuous and fused filament techniques. The tension test results of the single-angled specimens were then used to aid the design of multi-angled laminate for potential progressive failure behavior. A 3D finite element (FE) model was developed to predict the response of the experimental results and to provide insight into the failure mechanism of the multi-angled laminate. The experimental observations and the FE simulations show the possibility of producing pseudo ductile FRP-by-design composite using 3D-printing technology, which leads the way to fabricate next-generation composites for civil infrastructure.

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“…The peaks at 1267 cm −1 and 1370 cm −1 are ascribed to C-N stretching of hydroxide groups, while the peak at 3420 cm −1 can be assigned to the N-H stretching vibrations. The peaks at 1610 cm −1 and 1245 cm −1 correspond to the N-H bending and C-N stretches of amine, respectively [18].…”

Section: Resultsmentioning

confidence: 99%

Electrical and thermal characteristics of MWCNTs modified carbon fiber/epoxy composite films

Kareem

Rasheed

2019

Materials Science-Poland

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To enhance interfacial bonding between carbon fibers and epoxy matrix, the carbon fibers have been modified with multiwall carbon nanotubes (MWCNTs) using the dip-coating technique. FT-IR spectrum of the MWCNTs shows a peak at 1640 cm −1 corresponding to the stretching mode of the C=C double bond which forms the framework of the carbon nanotube sidewall. The broad peak at 3430 cm −1 is due to O-H stretching vibration of hydroxyl groups and the peak at 1712 cm −1 corresponds to the carboxylic (C=O) group attached to the carbon fiber. The peaks at 2927 cm −1 and 2862 cm −1 are assigned to C-H stretching vibration of epoxy produced at the defect sites of acid-oxidized carbon fiber surface. SEM image shows a better interface bonding between the fiber and the matrix of modified composites (MWCNTs-CF/Ep) than those of unmodified composite. The loss factor curve of CF-MWCNTs/Ep composites is the narrowest compared with neat epoxy and CF/Ep composites which evinces that the length distribution range of molecular chain segments in the matrix is the narrowest. From the dependence of the AC conductivity on temperature, we can see that σ AC increases when temperature increases. The increase in electrical conductivity of the composites may be a result of the increased chain ordering due to annealing effect. The use of MWCNTs to modify the surface of carbon fiber resulted in a large amount of junctions among MWCNT causing an increase in the electrical and thermal conductivity by forming conducting paths in the matrix. The MWCNTs-CF/Ep composite shows better thermal stability than unmodified composites. The strong interaction between CF and MWCNTs can retard diffusion of small molecules from the resin matrix at high temperature and hence, result in the improved thermal stability of the modified CF/Ep composite.

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Improving Fatigue Performance of GFRP Composite Using Carbon Nanotubes

Cited by 37 publications

References 41 publications

Effect of in-situ oxidative preparation on electrical properties of Epoxy/PANi/MWCNTs nanocomposites

Effect of in-situ oxidative preparation on electrical properties of Epoxy/PANi/MWCNTs nanocomposites

3D-Printed Pseudo Ductile Fiber-Reinforced Polymer (FRP) Composite Using Discrete Fiber Orientations

Electrical and thermal characteristics of MWCNTs modified carbon fiber/epoxy composite films

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