scholarly journals Shape-morphing carbon fiber composite using electrochemical actuation

2020 ◽  
Vol 117 (14) ◽  
pp. 7658-7664 ◽  
Author(s):  
Wilhelm Johannisson ◽  
Ross Harnden ◽  
Dan Zenkert ◽  
Göran Lindbergh
Keyword(s):  
Solid State ◽  
Carbon Fibers ◽  
Fiber Composite ◽  
Lithium Ion ◽  
Proof Of Concept ◽  
Carbon Fiber Composite ◽  
Shape Morphing ◽  
Commercial Carbon ◽  
Structural Battery ◽  
Shape Changes

Structures that are capable of changing shape can increase efficiency in many applications, but are often heavy and maintenance intensive. To reduce the mass and mechanical complexity solid-state morphing materials are desirable but are typically nonstructural and problematic to control. Here we present an electrically controlled solid-state morphing composite material that is lightweight and has a stiffness higher than aluminum. It is capable of producing large deformations and holding them with no additional power, albeit at low rates. The material is manufactured from commercial carbon fibers and a structural battery electrolyte, and uses lithium-ion insertion to produce shape changes at low voltages. A proof-of-concept material in a cantilever setup is used to show morphing, and analytical modeling shows good correlation with experimental observations. The concept presented shows considerable promise and paves the way for stiff, solid-state morphing materials.

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).

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.

Facile preparation of a V2O3/carbon fiber composite and its application for long-term performance lithium-ion batteries

2017 ◽  
Vol 41 (13) ◽  
pp. 5380-5386 ◽  
Author(s):  
Xinping Liu ◽  
Renpin Liu ◽  
Lingxing Zeng ◽  
Xiaoxia Huang ◽  
Xi Chen ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Carbon Nanofiber ◽  
Fiber Composite ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Carbon Fiber Composite ◽  
Long Term Performance ◽  
Term Performance

A V2O3/carbon-nanofiber composite was initially synthesized, which exhibited large reversible capacity and excellent long-term cycling performance for lithium-ion batteries.

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 An All-Solid-State Coaxial Structural Battery Using Sodium-Based Electrolyte

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5226
Author(s):  
Federico Danzi ◽  
Pedro Ponces Camanho ◽  
Maria Helena Braga
Keyword(s):  
Solid State ◽  
Specific Energy ◽  
Alkali Metals ◽  
Mechanical Performance ◽  
Lithium Ion ◽  
Mechanical Tests ◽  
Coaxial Cable ◽  
Safe Alternative ◽  
Structural Cell ◽  
Structural Battery

The transition to a sustainable society is paramount and requires the electrification of vehicles, the grid, industry, data banks, wearables, and IoT. Here, we show an all-solid-state structural battery where a Na+-based ferroelectric glass electrolyte is combined with metallic electrodes/current collectors (no traditional cathode present at fabrication) and thin-ply carbon-fiber laminates to obtain a coaxial multifunctional beam. This new concept aims to optimize the volume of any hollow beam-like structure by integrating an electrochemical system capable of both harvesting thermal and storing electrical energy while improving its mechanical performance. The coaxial cell is a coaxial cable where the dielectric is ferroelectric. The electrochemical results demonstrated the capability of performing three-minute charges to one-day discharges (70 cycles) and long-lasting discharges (>40 days at 1 mA) showing an energy density of 56.2 Wh.L−1 and specific energy of 38.0 Wh.kg−1, including the whole volume and weight of the structural cell. This is the highest specific energy among safe structural cells, while no Na+-based structural cells were found in the literature. The mechanical tests, instead, highlighted the coaxial cell capabilities to withstand severe inelastic deformation without compromising its functionalities, while increasing the flexural strength of the hosting structure. Moreover, the absence of alkali metals and liquid electrolytes together with its enhanced thermal properties makes this coaxial structural battery a valid and safe alternative as an energy reservoir for all the applications where traditional lithium-ion batteries are not suitable.

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.

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