EXPERIMENTAL EVALUATION OF COMPRESSIVE STRENGTH OF PAN-BASED CARBON MONOFILAMENT BY POISSON’S DEFORMATION IN CRUCIFORM SPECIMEN

2021 ◽  
Author(s):  
YUSUKE ODAIRA, ◽  
HIROSHI SAITO ◽  
ISAO KIMPARA
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Experimental Evaluation ◽  
Test Method ◽  
Single Fiber ◽  
Cruciform Specimen ◽  
Single Fibers ◽  
High Anisotropy

Carbon fiber has relatively high anisotropy in tensile and compressive strength. Since, the diameter of carbon fiber is 5~10[μm], it is difficult to directly evaluate the compressive strength of monofilament. In this study, the compressive strength of carbon single fiber was evaluated using Poisson's deformation of Cruciform specimen. Using the Cruciform test method, the compressive strengths of monofilaments of PAN-based carbon fibers, T300B and T700SC, were experimentally and analytically evaluated. As a result, the compressive strengths of carbon single fibers was 5.12 [GPa] for T300/PA6 and 5.54 [GPa] for T700/PA6 in this study.

scholarly journals Адитивне формування вуглекомпозитів на основі L-полілактиду

2020 ◽  
Vol 140 (6) ◽  
pp. 104-111
Author(s):  
Р. Ш. Іскандаров ◽  
Н. В. Сова ◽  
Б. М. Савченко ◽  
І. І. П'ятничук ◽  
В. А. Татаренко
Keyword(s):  
Tensile Strength ◽  
Additive Manufacturing ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Polymer Matrix ◽  
Fiber Composites ◽  
Carbon Composite ◽  
Test Method ◽  
Carbon Fiber Composites ◽  
Injection Molded

Study of the FFF additive manufacturing process of composite material based on L – polylactide (PLLA) with ultra-short carbon fibers. Tensile strength and elongation at break for all test specimens were determined according to ISO 527. Tensile modulus - ASTM D638-10, specimen density - PN-EN ISO 1183, microscopic examination - according to ASTM E2015 - 04 (2014). Charpy Shock Tests ISO 179 and ASTM D256. Bending test method ISO 178 and ASTM D 790. The rational modes of FFF additive manufacturing (AM) of carbon fiber composite based on PLLA was established. Properties of carbon fiber PLLA and unfilled PLLA was determinated for AM formed samples and injection molded samples. Carbon fiber composites have significantly higher flexural and tensile module us values compared to the original L-polylactide, which is due to the effect of polymer matrix reinforcement by the fibrous component. However, finished products obtained by AM PLLA carbon composite have a lower impact strength and tensile strength, which is likely to be due to the fact that the carbon fibers are short (50-60 mkm) and have a cavitations effect during injection molding and AM. Density of carbon fiber filled PLLLA was lower the theoretically calculated value for filament material as well for injection molded and AM formed samples. Density reduction probably the main cause of impact properties deterioration due to cavity forming around carbon fibers. Density and tensile properties of AM formed samples can be changed by AM slicing parameter – extrusion multiplier. Cavitation effect for carbon fiber composites observed for PLLA composite in form AM filament, injection molded parts and AM formed samples. Cavity forming was confirmed by optical microscopy and density measurement. Possible reason for cavity forming is orientation deformation of the fiber in polymer matrix during the formation of the filament. The effect of cavitation also persists in the AM of products from carbon composites due to the passage of the orientation at the exit of the printer nozzle.  The possibility of regulating the density and physical and mechanical properties of carbon composite products obtained by the additive manufacturing method has been established. Selection of rational values of the extrusion multiplier and the direction of the layers in the additive molding allows you to create products with the desired complex of properties.

Carbon fiber reinforced tin-superconductor composites

1989 ◽  
Vol 4 (6) ◽  
pp. 1339-1346 ◽  
Author(s):  
C. T. Ho ◽  
D. D. L. Chung
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Tensile Modulus ◽  
Tensile Load ◽  
Tensile Fracture ◽  
Fiber Direction ◽  
Continuous Carbon Fiber

Unidirectional and continuous carbon fiber tin-matrix composites were used for the packaging of the high-temperature superconductor YBa2Cu3O7–δ by diffusion bonding at 170 °C and 500 psi. Tin served as the adhesive and to increase the ductility, the normal-state electrical conductivity, and the thermal conductivity. Carbon fibers served to increase the strength and the modulus, both in tension along the fiber direction and in compression perpendicular to the fiber layers, though they decreased the strength in compression along the fiber direction. Carbon fibers also served to increase the thermal conductivity and the thermal fatigue resistance. At 24 vol. % fibers, the tensile strength was approximately equal to the compressive strength perpendicular to the fiber layers. With further increase of the fiber content, the tensile strength exceeded the compressive strength perpendicular to the fiber layers, reaching 134 MPa at 31 vol. % fibers. For fiber contents less than 30 vol. %, the compressive ductility perpendicular to the fiber layers exceeded that of the plain superconductor. At 30 vol. % fibers, the tensile modulus reached 15 GPa at room temperature and 27 GPa at 77 K. The tensile load was essentially sustained by the carbon fibers and the superconducting behavior was maintained after tension almost to the point of tensile fracture. Neither Tc nor Jc was affected by the composite processing.

Influence of Time Evolution in the Modulus of Elasticity of Concrete Reinforced by Carbon Fibers

2015 ◽  
Vol 1088 ◽  
pp. 640-643
Author(s):  
Letícia Couto Aguiar ◽  
Luiz A. Melgaço N. Branco ◽  
Eduardo Chahud ◽  
Francisco Antonio Rocco Lahr ◽  
André L. Christoforo ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Behavior Analysis ◽  
Time Evolution ◽  
Carbon Fibers ◽  
Modulus Of Elasticity ◽  
Strain Difference ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Axial Strength

The modulus of elasticity is an important property for the behavior analysis of concrete structures. This research evaluated the strain difference between concrete specimens with and without the application of laminate carbon fiber composites as well as the variation time, in months, of the axial strength compression and modulus of elasticity. Through the experimental results, it is concluded that increases in compressive strength and modulus of elasticity are more significant in the specimens without reinforcement.

Experimental investigation for the effect of fiber on the mechanical properties of light-weight concrete under dry and wet conditions

2019 ◽  
Vol 11 (2) ◽  
pp. 216-238
Author(s):  
Faezeh Nejati ◽  
S.A. Edalatpanah
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Significant Role ◽  
Fine Aggregate ◽  
Content Type ◽  
Dry And Wet Conditions ◽  
Tension Strength

Purpose The purpose of this paper is to investigate the effect of steel and carbon fibers on the mechanical properties of light concrete in terms of tension strength, compressive strength and elastic modulus under completely dry and wet conditions. Design/methodology/approach In this study, the lightweight concrete made of Light Expanded Clay Aggregate (LECA) as coarse aggregate and sand as fine aggregate was used. To achieve a compressive strength of at least 20 MPa, microsilica was used 10 percent by weight of cement. In order to compensate for the reduction of tension strength of concrete, steel and carbon fibers were used with three volume ratio of 0.5, 1 and 1.5 percent in concrete. The results of concrete specimens were studied at the age of 7, 28, 42 and 90 days under controlled dry and wet conditions. Findings The results showed that the addition of steel and carbon fibers to the concrete mixture would reduce the drop in slump. Also, the use of steel and carbon fibers plays a significant role in increasing the tension strength of the specimens. Furthermore, the highest increase in tension strength of steel and carbon fiber samples was 83.3 and 50 percent, respectively, than the non-fibrous specimen when evaluated at 90 days of age. Moreover, the steel and carbon fiber increased the water absorption of the samples. Adding steel and carbon fibers to a lightweight concretes mixture containing LECA aggregates plays a significant role in increasing the modulus of elasticity of the samples. The highest increase in the elastic modulus of steel and carbon fibers was 18.9 and 35.4 percent, respectively, than the non-fibrous specimen at 28 days of age. Originality/value In this paper, the authors investigated the mechanical properties of steel fiber and carbon reinforced concrete. Also, according to the conditions of storage of samples and the age of concrete (day), the experiments were carried out on samples.

scholarly journals Mechanical and Tribological Properties of Polytetrafluoroethylene Composites with Carbon Fiber and Layered Silicate Fillers

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 224 ◽  
Author(s):  
Andrey P. Vasilev ◽  
Tatyana S. Struchkova ◽  
Leonid A. Nikiforov ◽  
Aitalina A. Okhlopkova ◽  
Petr N. Grakovich ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Compressive Strength ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Layered Silicate ◽  
Layered Silicates ◽  
Filler Materials ◽  
Mechanical And Tribological Properties

Mixtures of layered silicates (vermiculite and kaolinite) and carbon fibers were investigated as filler materials for polytetrafluoroethylene. The supramolecular structure and the tribological and mechanical properties of the resulting polymer composite materials were evaluated. The yield strength and compressive strength of the polymer increased by 55% and 60%, respectively, when a mixed filler was used, which was attributed to supramolecular reinforcement of the composites. In addition, the wear resistance increased by 850 times when using vermiculite/kaolinite fillers, which was due to protection of the surface by the formation of hard tribofilms.

scholarly journals A Reciprocal Research on Compressive Strength of Conventional Concrete and Carbon Fibre Concrete Exposed to High Temperature

2019 ◽  
Vol 8 (12) ◽  
pp. 5767-5772
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Concrete Structure ◽  
Conventional Concrete ◽  
Fibre Concrete ◽  
Overall Performance ◽  
Compressive Strength Of Concrete ◽  
Concrete Elements

An look up has been function to evaluated the have an impact on of evaluated temperature on the compressive strength of grade concrete M25, the goal of the discover out about used to be once to actuate and observe the big difference in compressive strength containing no fiber and concrete with fiber as properly as have an impact on of temperature on compressive strength of concrete. 72 concrete cubes of 150mm measurement have been cast. The carbon fibers used in the learn about are 6mm long chopped carbon fibers& dosage of 0.3%, 0.6%, and 0.9% by the weight of concrete. Concrete elements exposed to fire, undergo bodily changes or spalling which leads to expose metal reinforcement .This motives misery in concrete structure .The overall performance of the concrete can be lengthen with the addition of carbon fiber. Undergo bodily changes or spalling which leads to expose metal reinforcement .This motives misery in concrete structure .The overall performance of the concrete can be lengthen with the addition of carbon fiber. It can be noticed that carbon fiber reinforcement exhibits more compressive strength than the conventional concrete exposed to high temperature.

scholarly journals Performance and Cost-Effectiveness of Short Pitch-Based Carbon Fiber Reinforced Mortar Composite

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4693
Author(s):  
Md. Safiuddin ◽  
George Abdel-Sayed ◽  
Nataliya Hearn
Keyword(s):  
Compressive Strength ◽  
Cost Effectiveness ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Water Absorption ◽  
Carbon Fibers ◽  
Impact Resistance ◽  
Volume Flow ◽  
Unit Weight ◽  
Air Content

This paper discusses the performance of the short pitch-based carbon fiber reinforced mortar (CFRM) composite considering its key properties and cost-effectiveness. Five different types of mortar composite were produced using 0–4% volume contents of short pitch-based carbon fibers. The mortar composites were tested for inverted slump cone flow (flow time and volume flow), unit weight, air content, compressive strength, flexural strength, impact resistance, and water absorption. The cost-effectiveness of CFRM was assessed based on the performance to cost ratio (PCR), which was calculated for each mortar composite, considering its workability, mechanical properties, and durability. The inverted slump cone volume flow was counted as a measure of workability, whereas the compressive strength, flexural strength, and impact resistance were considered as the major attributes of the mechanical behavior. In addition, the water absorption was used as a measure of durability. The test results revealed that the mortar composite made with 3% carbon fibers provided adequate workability, a relatively high unit weight and low air content, the highest compressive strength, excellent flexural strength, good impact resistance, and the lowest water absorption. It was also found that the PCR increased up to 3% carbon fibers. Beyond a 3% fiber content, the PCR significantly decreased. The overall research findings revealed that the mortar with 3% carbon fibers was the optimum and most cost-effective mortar composite.

Determination of the compression test method for high temperature-resistant carbon fiber reinforced plastics

2020 ◽  
pp. 103-113
Author(s):  
S. I. Voinov ◽  
I. V. Zelenina ◽  
M. I. Valueva ◽  
I. N. Gulyaev
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Carbon Fiber ◽  
High Heat ◽  
Test Method ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Carbon Fiber Reinforced

The article presents the results of studies of carbon fiber reinforced plastic VS-51/VTkU-2.200. The influence of the thickness of the specimens and the size of working gage on the compressive strength of carbon fiber reinforced plastic specimens was evaluated; tests were done in accordance with different standards. The results of compression strength tests at high temperature (300–320°С) are given: carbon fiber reinforced plastic VS-51/VTkU-2.200 shows high heat resistance and keeps compressive strength at high temperature tests. Carbon fiber reinforced plastic VS-51/VTkU-2.200 is of increasing interest for application in aircraft structural parts requiring high temperature resistance.

Molecular Dynamics Analysis on Compressive Strength of PAN-Based Carbon Fibers

2014 ◽  
Vol 13 (04) ◽  
pp. 1440004
Author(s):  
Shingo Okamoto ◽  
Akihiko Ito
Keyword(s):  
Molecular Dynamics ◽  
Compressive Strength ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Compressive Loading ◽  
Amorphous Structure ◽  
Aspect Ratios ◽  
Buckling Behavior ◽  
Amorphous Structures ◽  
Dynamics Simulations

We investigated the compressive strength of PAN-based carbon fibers containing both amorphous and crystalline structures using molecular dynamics simulations. In addition, we investigated the buckling behavior of graphene and graphite crystals under compressive loading. The calculated buckling stresses of those crystals with different aspect ratios agree well with the results by the Euler's buckling theory. We finally found that the compressive strength of the PAN-based carbon fiber with a large amount of amorphous structures was 11 GPa. Moreover, a fracture of the PAN-based carbon fiber begins due to the buckling of carbon layers in crystallites, and propagates with the shear slipping in the crystallites. On the other hand, the compressive strength of the carbon fiber with a small amount of amorphous structures was only 2 GPa. Thus, it was found that the amorphous structure significantly affects the compressive strength of PAN-based carbon fibers.

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