Modeling the Compressive Buckling Strain as a Function of the Nanocomposite Interphase Thickness in a Carbon Nanotube Sheet Wrapped Carbon Fiber Composite

2019 ◽  
Vol 86 (10) ◽  
Author(s):  
Xuemin Wang ◽  
Tingge Xu ◽  
Rui Zhang ◽  
Monica Jung de Andrade ◽  
Pruthul Kokkada ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Polymer Matrix Composites ◽  
Fiber Composite ◽  
Unidirectional Composite ◽  
Interfacial Shear ◽  
Carbon Fiber Composite ◽  
Interphase Region

Polymer matrix composites have high strengths in tension. However, their compressive strengths are much lower than their tensile strengths due to their weak fiber/matrix interfacial shear strengths. We recently developed a new approach to fabricate composites by overwrapping individual carbon fibers or fiber tows with a carbon nanotube sheet and subsequently impregnate them into a matrix to enhance the interfacial shear strengths without degrading the tensile strengths of the carbon fibers. In this study, a theoretical analysis is conducted to identify the appropriate thickness of the nanocomposite interphase region formed by carbon nanotubes embedded in a matrix. Fibers are modeled as an anisotropic elastic material, and the nanocomposite interphase region and the matrix are considered as isotropic. A microbuckling problem is solved for the unidirectional composite under compression. The analytical solution is compared with finite element simulations for verification. It is determined that the critical load at the onset of buckling is lower in an anisotropic carbon fiber composite than in an isotropic fibfer composite due to lower transverse properties in the fibers. An optimal thickness for nanocomposite interphase region is determined, and this finding provides a guidance for the manufacture of composites using aligned carbon nanotubes as fillers in the nanocomposite interphase region.

scholarly journals Lightweight Cellulose/Carbon Fiber Composite Foam for Electromagnetic Interference (EMI) Shielding

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1319 ◽  
Author(s):  
Ran Li ◽  
Huiping Lin ◽  
Piao Lan ◽  
Jie Gao ◽  
Yan Huang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Electromagnetic Interference ◽  
Fiber Composite ◽  
Carbon Fiber Composites ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding ◽  
Carbon Fiber Composite ◽  
Foaming Process ◽  
Long Carbon Fibers

Lightweight electromagnetic interference shielding cellulose foam/carbon fiber composites were prepared by blending cellulose foam solution with carbon fibers and then freeze drying. Two kinds of carbon fiber (diameter of 7 μm) with different lengths were used, short carbon fibers (SCF, L/D = 100) and long carbon fibers (LCF, L/D = 300). It was observed that SCFs and LCFs built efficient network structures during the foaming process. Furthermore, the foaming process significantly increased the specific electromagnetic interference shielding effectiveness from 10 to 60 dB. In addition, cellulose/carbon fiber composite foams possessed good mechanical properties and low thermal conductivity of 0.021–0.046 W/(m·K).

Experimental Investigation of the Machinability of Polycarbonate Reinforced With Multiwalled Carbon Nanotubes

2005 ◽  
Vol 128 (2) ◽  
pp. 465-473 ◽  
Author(s):  
J. Samuel ◽  
R. E. DeVor ◽  
S. G. Kapoor ◽  
K. J. Hsia
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Multiwalled Carbon Nanotubes ◽  
Cutting Forces ◽  
Fiber Composite ◽  
Chip Morphology ◽  
Surface Characteristics ◽  
Carbon Fiber Composite ◽  
Multiwalled Carbon ◽  
Machined Surface

The machinability of a polycarbonate nanocomposite containing multiwalled carbon nanotubes is investigated and contrasted with its base polymer and with a conventional carbon fiber composite. The material microstructures are characterized using transmission electron and scanning electron microscopy methods. Micro-endmilling experiments are conducted on the three materials. Chip morphology, machined surface characteristics, and the nature of the cutting forces are employed as machinability measures for comparative purposes. Polycarbonate chips are seen to transition from being discontinuous to continuous as the feed-per-tooth (FPT) increases, while, at all FPT values the nanocomposite is seen to form comparatively thicker continuous chips. The nanocomposite and the carbon fiber composite are seen to have the lowest and the highest magnitudes, respectively, for both the surface roughness and cutting forces. Shearing along the nanotube-polymer interface and better thermal conductivity are speculated to be the mechanisms responsible for the observations seen in the nanocomposite.

Layup Analyzing of a Carbon/Glass Hybrid Composite Wind Turbine Blade Using Finite Element Analysis

2011 ◽  
Vol 87 ◽  
pp. 49-54 ◽  
Author(s):  
Hai Chen Lin
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Wind Turbine ◽  
Glass Fiber ◽  
Turbine Blade ◽  
Carbon Fibers ◽  
Fiber Composite ◽  
Wind Turbine Blade ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite

This thesis use AOC15/50 blade as baseline model which is a composite wind turbine blade made of glass/epoxy for a horizontal axis wind turbine. A finite element modeling of composite wind turbine blade was created using the SHELL element of ANSYS. Then we study how to use the carbon fiber material replaces the glass fiber to make the hybrid blade, and find a suitable layup to improve the performance of the blade. The hybrid blade was made through introducing carbon fibers. Different models, with introducing different number of carbon fibers, 75% carbon fibers replace unidirectional glass fibers in spar cap of blade model which can achieve best structure performance. The wind turbine blades are often fabricated by hand using multiple of glass fiber-reinforced polyester resin or glass fiber-reinforced epoxy resin. As commercial machines get bigger, this could not to meet the demands. The advantages of carbon fiber composite materials are used by blade producer. Studies show that carbon fiber has high strength-to-weight ratio and resistance fatigue properties. Carbon fiber is mixed with epoxy resin to make into carbon fiber-reinforced polymer. Carbon fiber-reinforced polymer is the one of best blade materials for resistance bad weather. The stiffness of carbon fiber composite is 2 or 3 times higher than glass fiber composite [1], but the cost of carbon fiber composite is 10 times higher than glass fiber composite. If all of wind turbine blades are made of carbon fiber composite, it will be very expensive. Therefore carbon/glass fiber hybrid composite blade has become a research emphasis in the field of blade materials. This paper gives an example of finite element modeling composite wind turbine blade in ANSYS by means of the medium-length blade of AOC 15/50 horizontal axis wind turbine. This model can be directly used in dynamics analysis and does not need to be imported from the CAD software into finite element program. This finite element modeling of composite wind turbine blade was created using the SHELL element of ANSYS. Then we study how to use the carbon fiber material replaces the glass fiber to make the hybrid blade, and find a suitable lay-up to improve the performance of the blade.

Preparation of the Carbon Nanotube / Carbon Fiber Composite and Application as the Electrode Material of the Electrochemical Super Capacitor

2011 ◽  
Vol 687 ◽  
pp. 158-162 ◽  
Author(s):  
Qi Jiang ◽  
Rong Yang ◽  
Guang Gang Fu ◽  
De Yu Xie ◽  
Bin Huang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Chemical Vapor ◽  
Electrochemical Performances ◽  
Carbon Fiber Composite ◽  
Super Capacitor ◽  
Current Collection ◽  
Spray Method

Carbon nanotube (CNT) / carbon fiber (CF) composite was prepared by growing CNT in situ on the CF surface with catalytic chemical vapor deposition. The morphology of the obtained composite was characterized by the scanning electron microscopy. The results show that the CNT is trimly and equably grown on the CF surface. The obtained CNT/CF composite is covered with a layer of nickel (Ni) as a current collection on one side of the composite through the spray method. Then, the obtained materials were assembled to electrochemical super capacitors to characterize their electrochemical performances. The results show that the specific capacitance of the composite could be up to 105.4 F•g-1(organic electrolyte), which is much higher than those of the pure CNT and the CF (about 25.0 and 62.2F•g-1, respectively). These experimental results show that CNT grown in situ on the CF surface is a simple and feasible method to enhance the composite electrochemical performances.

Manufacturing Technique and Property Evaluation of Polypropylene/ Carbon Fiber Composite Braids

2011 ◽  
Vol 239-242 ◽  
pp. 141-144
Author(s):  
Jia Horng Lin ◽  
Jin Mao Chen ◽  
Ching Wen Lin ◽  
Wen Hao Hsing ◽  
Yu Chia Hsu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Thermal Treatment ◽  
Tensile Properties ◽  
Carbon Fibers ◽  
Fiber Composite ◽  
Carbon Fiber Composite ◽  
Manufacturing Technique ◽  
Property Evaluation ◽  
Different Levels

In this study, carbon fibers (CF) were braided with polypropylene (PP) fibers on a 16-spindle braid machine, forming the PP/ CF composite braids. The composite braids with different levels of strength could be obtained by changing the speed of the yarn turntable and volume gauze. The composite braids with optimum tensile strength then received the thermal treatment, which melted the PP fibers to wrap the CF more tightly, stabilizing the structure of the composite braids. According to CNS 11623 (Tensile Properties of Geogrids by the Single), the composite braids were thermal-treated at 170 °C, 180 °C and 190 °C for1 min, 2 min and 3 min, determing the influence of thermal temperature and duration on the tensile strength of PP/ CF composite braids.

scholarly journals Electrochemical fabrication and evaluation of a self-standing carbon nanotube/carbon fiber composite electrode for lithium-ion batteries

RSC Advances ◽  
2019 ◽  
Vol 9 (57) ◽  
pp. 33117-33123 ◽  
Author(s):  
Yi-Hung Liu ◽  
Heng-Han Lin ◽  
Tsung-Yu Tsai ◽  
Chun-Han Hsu
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Composite Electrode ◽  
Fiber Composite ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Carbon Fiber Composite ◽  
Binder Free ◽  
Electrochemical Fabrication ◽  
Battery Anode

A binder-free CNT/CF composite electrode is developed via electrophoretic deposition, offering favorable electrochemical performances and stability as a self-standing lithium-ion battery anode.

scholarly journals Synergetic Effects of Mechanical Properties on Graphene Nanoplatelet and Multiwalled Carbon Nanotube Hybrids Reinforced Epoxy/Carbon Fiber Composites

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Pin-Ning Wang ◽  
Tsung-Han Hsieh ◽  
Chin-Lung Chiang ◽  
Ming-Yuan Shen
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Fiber Composite ◽  
Synergetic Effect ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Multiwalled Carbon

Graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs) are novel nanofillers possessing attractive characteristics, including robust compatibility with most polymers, high absolute strength, and cost effectiveness. In this study, an outstanding synergetic effect on the grapheme nanoplatelets (GNPs) and multiwalled carbon nanotubes (CNTs) hybrids were used to reinforce epoxy composite and epoxy/carbon fiber composite laminates to enhance their mechanical properties. The mechanical properties of CNTs/GNPs hybrids on a fixed weight fraction (1 wt%) with mixing different ratio reinforced epoxy nanocomposite, such as ultimate tensile strength and flexure properties, were investigated. The mechanical properties of epoxy/carbon fiber composite laminates containing different proportions of CNTs/GNPs hybrids (0.5, 1.0, 1.5 wt%) were increased over that of neat laminates. Consequently, significant improvement in the mechanical properties was attained for these epoxy resin composites and carbon fiber-reinforced epoxy composite laminates.

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