scholarly journals Enhancing the Viscoelastic Performance of Carbon Fiber Composites by Incorporating CNTs and ZnO Nanofillers

2019 ◽  
Vol 9 (11) ◽  
pp. 2281 ◽  
Author(s):  
Suma Ayyagari ◽  
Marwan Al-Haik
Keyword(s):  
Activation Energy ◽  
Carbon Fiber ◽  
Creep Resistance ◽  
Viscoelastic Properties ◽  
Mechanical Analysis ◽  
Zinc Oxide Nanorods ◽  
Carbon Fiber Composites ◽  
Reinforced Plastic ◽  
Uniform Dispersion ◽  
Frequency Sweeps

Carbon fiber reinforced plastic composites (CFRPs) possess superior elastic mechanical properties. However, CFRPs lack sufficient viscoelastic performance, such as damping and creep resistance. In an effort to improve these properties, in this study, hybrid multiscale composites with various combinations of zinc oxide nanorods (ZnO) and carbon nanotubes (CNTs) were deposited at the interface of carbon fiber laminae. The viscoelastic properties of the corresponding composites were characterized via dynamic mechanical analysis (DMA) during both temperature and frequency sweeps. The creep activation energy for each composite configuration was also calculated. The DMA temperature sweep analysis reported that the composite incorporating both ZnO and CNTs exhibited the highest improvements in all viscoelastic properties. This composite also attained better creep resistance, evident by the highest activation energy. The DMA frequency sweep analysis revealed that composites incorporating a single nanofiller improves the viscoelastic properties more than the combined nanofiller composite. Despite these improvements in the viscoelastic properties, the non-uniform dispersion and agglomerations of the nanofillers affected some of the elastic properties negatively, such as the storage modulus.

Influence of water immersion and ultraviolet weathering on mechanical and viscoelastic properties of polyphenylene sulfide–carbon fiber composites

2013 ◽  
Vol 28 (3) ◽  
pp. 340-356 ◽  
Author(s):  
Natassia Lona Batista ◽  
Maria Cândida Magalhães de Faria ◽  
Koshun Iha ◽  
Pedro Carlos de Oliveira ◽  
Edson Cocchieri Botelho
Keyword(s):  
Carbon Fiber ◽  
Viscoelastic Properties ◽  
Water Immersion ◽  
Fiber Composites ◽  
Polyphenylene Sulfide ◽  
Carbon Fiber Composites ◽  
Influence Of Water

Effects of moisture absorption on mechanical and viscoelastic properties in liquid thermoplastic resin/carbon fiber composites

2019 ◽  
Vol 59 (11) ◽  
pp. 2185-2194
Author(s):  
Lorena Cristina Miranda Barbosa ◽  
Monique Santos ◽  
Thiago Luiz Lara Oliveira ◽  
Guilherme Ferreira Gomes ◽  
Antonio Carlos Ancelotti Junior
Keyword(s):  
Carbon Fiber ◽  
Viscoelastic Properties ◽  
Moisture Absorption ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Thermoplastic Resin

scholarly journals Characterization of Highly Filled Glass Fiber/Carbon Fiber Polyurethane Composites with the Addition of Bio-Polyol Obtained through Biomass Liquefaction

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1391
Author(s):  
Adam Olszewski ◽  
Paweł Nowak ◽  
Paulina Kosmela ◽  
Łukasz Piszczyk
Keyword(s):  
Carbon Fiber ◽  
Glass Fibers ◽  
Mechanical Analysis ◽  
Dibutyltin Dilaurate ◽  
Material Structure ◽  
Carbon Fiber Composites ◽  
Material Defects ◽  
Methylene Diphenyl Diisocyanate ◽  
Wide Range ◽  
Polyurethane Composites

This work aims to investigate the process of obtaining highly filled glass and carbon fiber composites. Composites were manufactured using previously obtained cellulose derived polyol, polymeric methylene diphenyl diisocyanate (pMDI). As a catalyst, dibutyltin dilaurate 95% and Dabco® 33-LV were used. It was found that the addition of carbon and glass fibers into the polymer matrix causes an increase in the mechanical properties such as impact and flexural strength, Young’s modulus, and hardness of the material. Moreover, the dynamic mechanical analysis (DMA) showed a significant increase in the material’s storage modulus and rigidity in a wide range of temperatures. The increase in glass transition of soft segments can be noticed due to the limitation of macromolecules mobility in the material. The thermogravimetric analysis showed a four step decomposition, with maximal degradation rate at TmaxII = 320–330 °C and TmaxIII = 395–405 °C, as well as a significant improvement of thermal stability. Analysis of the material structure using a scanning electron microscope showed the presence of material defects such as voids, fiber pull-outs, and agglomerates of both fibers.

scholarly journals Multiscale Hybrid Micro-Nanocomposites Based on Carbon Nanotubes and Carbon Fibers

2010 ◽  
Vol 2010 ◽  
pp. 1-12 ◽  
Author(s):  
Fawad Inam ◽  
Doris W. Y. Wong ◽  
Manabu Kuwata ◽  
Ton Peijs
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Hybrid Composites ◽  
Flexural Modulus ◽  
Mechanical Analysis ◽  
Impact Testing ◽  
Mode I ◽  
Carbon Fiber Composites ◽  
Resin Infusion ◽  
Maximum Enhancement

Amino-modified double wall carbon nanotube (DWCNT-NH2)/carbon fiber (CF)/epoxy hybrid micro-nanocomposite laminates were prepared by a resin infusion technique. DWCNT-NH2/epoxy nanocomposites and carbon fiber/epoxy microcomposites were made for comparison. Morphological analysis of the hybrid composites was performed using field emission scanning electron microscope. A good dispersion at low loadings of carbon nanotubes (CNTs) in epoxy matrix was achieved by a bath ultrasonication method. Mechanical characterization of the hybrid micro-nanocomposites manufactured by a resin infusion process included three-point bending, mode I interlaminar toughness, dynamic mechanical analysis, and drop-weight impact testing. The addition of small amounts of CNTs (0.025, 0.05, and 0.1 wt%) to epoxy resins for the fabrication of multiscale carbon fiber composites resulted in a maximum enhancement in flexural modulus by 35%, a 5% improvement in flexural strength, a 6% improvement in absorbed impact energy, and 23% decrease in the mode I interlaminar toughness. Hybridization of carbon fiber-reinforced epoxy using CNTs resulted in a reduction in and dampening characteristics, presumably as a result of the presence of micron-sized agglomerates.

Reinforcing MWCNTs to enhance viscoelastic properties of polyurethane nanocomposites by using nano DMA techniques

2020 ◽  
pp. 089270572093074 ◽  
Author(s):  
Dinesh Kumar ◽  
Navin Kumar ◽  
Prashant Jindal
Keyword(s):  
Composite Material ◽  
Storage Modulus ◽  
Viscoelastic Properties ◽  
High Strength ◽  
Mechanical Analysis ◽  
Elastic Behavior ◽  
Loading Frequency ◽  
Uniform Dispersion ◽  
Tan Δ ◽  
A Minor

Multi-walled carbon nanotubes (MWCNTs)-reinforced polyurethane (PU) composites were fabricated by using solution mixing technique followed by compression molding. Nano dynamic mechanical analysis was carried out to investigate the viscoelastic properties of PU/MWCNTs composites within a frequency range of 5–250 Hz. At higher frequencies (250 Hz), the storage modulus of PU/MWCNTs composites with 10 wt% loading of MWCNTs was enhanced by 148% in equivalence to pristine PU. An improvement of 13.3% in storage modulus was observed at a loading frequency of 250 Hz in comparison to that of a loading frequency of 75 Hz, which indicates that the effect of MWCNTs on storage modulus was more pronounced at higher frequencies. At 75 Hz, a minor composition of MWCNTs (3 wt%) was sufficient to reduce the value of tan δ from 0.20 to 0.15, indicating that the material becomes more elastic after reinforcing MWCNTs. This significant improvement in the mechanical behavior of composite material has been attributed to the uniform dispersion of MWCNTs, and their adhesion with PU molecules. Reported enhancement in the elastic behavior of PU composite will boost the applicability of PU-based composite material for the fabrication of high-strength boots, gloves, and jackets required to absorb high vibration frequencies experienced during conditions such as rock drilling.

Laser Wavelengths Suitable for Generating Ultrasonic Waves in Resin-Coated Carbon Fiber Composites

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Osamu Saito ◽  
Enhi Sen ◽  
Yoji Okabe ◽  
Nobuhiro Higuchi ◽  
Hideki Ishizuki ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Laser Doppler Vibrometer ◽  
Laser Wavelength ◽  
Ultrasonic Waves ◽  
Coated Sample ◽  
Carbon Fiber Composites ◽  
Periodically Poled ◽  
Thermal Generation ◽  
Reinforced Plastic ◽  
Non Destructive

Abstract For the non-destructive inspection of carbon fiber-reinforced plastic (CFRP), lasers can be used to generate ultrasonic waves. It is important to optimize the wavelength of the laser to ensure the intense excitation of a usable propagating mode. Real CFRP components used in the construction of airplanes and automobiles are often coated with several types of resin to protect against weathering. These resin layers change the excitation of the ultrasonic waves. Thus, the optimum laser wavelength may be changed by the coating resin. In this paper, we investigated the excitation of ultrasonic waves in a resin-coated CFRP plate using different laser wavelengths. We conducted experiments to convert the laser wavelength using periodically poled LiNbO3 (PPLN) devices. By injecting mid-infrared laser to a coated sample, we observed excited ultrasonic waves using a laser Doppler vibrometer. We found that transparent resins significantly increase the amplitude of the first-arriving longitudinal wave. Furthermore, when the laser was strongly absorbed in the surface layer, the excitation of longitudinal waves was suppressed. These results were clarified by a one-dimensional model of the thermal generation of ultrasonic waves. We concluded that a laser passing through a resin layer is a viable candidate for the effective inspection of coated CFRP by laser ultrasonic waves.

scholarly journals Interlaminar Toughening of Epoxy Carbon Fiber Reinforced Laminates: Soluble Versus Non-Soluble Veils

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1029 ◽  
Author(s):  
Giulia Ognibene ◽  
Alberta Latteri ◽  
Salvatore Mannino ◽  
Lorena Saitta ◽  
Giuseppe Recca ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Composites ◽  
Mechanical Analysis ◽  
Resin Matrix ◽  
Carbon Fiber Composites ◽  
Resin Infusion ◽  
Cantilever Bending ◽  
Toughness Improvement ◽  
Fiber Reinforced Laminates

This work describes the evaluation of different interlaminar veils to improve the toughening of epoxy/carbon fiber composites manufactured by resin infusion. Three commercial veils have been used in the study: two electro spun thermoplastic nanofiber (Xantulayr® from Revolution Fibres) with different areal weight, and one micro carbon fibers veil (Optiveil® from TFP). Two laboratory made veils were also manufactured by electrospinning commercial polyethersulfone (PES) tougheners (Virantage by Solvay). The veils were selected to be either soluble or non-soluble in the epoxy resin matrix during curing. The solubility was analyzed by scanning electron microscopy and dynamic mechanical analysis testing on the cured laminates. The fracture energy was evaluated by double cantilever bending (DCB) testing under Mode I loading. The insoluble thermoplastic nanofibers showed the highest toughening efficiency, followed by the soluble nanofiber veils. The carbon fiber based veil showed no toughness improvement.

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