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Carbon Fiber - DOAJ

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Last Updated: 10 September 2022

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Flexural Strengthening of Prestressed Girders with Partially Damaged Strands Using Enhancement of Carbon Fiber Laminates by End Sheet Anchorages

This paper investigates the effect of elastic stretching in partially repaired concrete beams and the recovery conditions using CFRP composite longitudinal laminates at the soffit, and end anchorage U-wrap sheets to restore the original flexural strength and minimize the delamination of longitudinal Carbon Fiber Reinforced Polymer laminates.

Source link: https://doi.org/10.48084/etasr.5007


Imidazolium Salt for Enhanced Interfacial Shear Strength in Polyphenylene Sulfide/Ex-PAN Carbon Fiber Composites

Polyphenylene sulfide and ex-PAN carbon fibers' surface chemistry, microstructure, and micromechanical properties of this paper are investigated. The incorporation of ionic salt such as 1,3-Bisimidazolium chloride into neat polyphenylene sulfide was shown to significantly raise the interfacial shear strength measured by microbond micromechanical testing combined with different carbon fiber surface treatments.

Source link: https://doi.org/10.3390/polym14173692


Effect of Interlaminar Toughness on the Residual Compressive Capacity of Carbon Fiber Laminates with Different Types of Delamination

The effects of interlaminar properties and the type of delamination defects on carbon fiber laminates' residual compression characteristics were experimentally investigated in this paper. The compressive strength of the specimens with the deeply embedded delamination decreased by 14. 01 MPa as the mode I toughness increased by 81. 8 percent, but the specimen containing the surface delamination only decreased by 30. 86 MPa when the mode II fracture toughness increased by 87. 72%. The reason for the increase in the toughness impeded the secondary delamination process, limiting the delamination area's relative deposition area almost unchanged, which was the reason why the increase in the toughness could have hampered the lamination containing delamination.

Source link: https://doi.org/10.3390/polym14173560


Stitching Repair for Delaminated Carbon Fiber/Bismaleimide Composite Laminates

Bismaleimide matrix composite materials have been widely used in aircraft due to their excellent mechanical properties and heat resistance. After the curing process, the fiber bundles threading through the laminate become the pins, resulting in the bridging effect between delaminated layers. The modulus was fully recovered, according to the results, for a carbon fiber/bismaleimide composite plate with a circular delamination of about 30 mm in diameter.

Source link: https://doi.org/10.3390/polym14173557


Constructing a Double Alternant “Rigid-Flexible” Structure for Simultaneously Strengthening and Toughening the Interface of Carbon Fiber/Epoxy Composites

An optimized w201crigid-flexible polyethyleneimine and u201crigid polydopamine were combined with a multistage gradient modulus, resulting in an aesthetically pleasing double alternant u201c ribbed concrete composite framework for simultaneously strengthening and thinning CF/EP composites. PDA and PEI polymers can both greatly improve the roughness and wettability of CF surfaces, as well as increasing the mechanical interlocking and chemical interactions between CFs and epoxy. According to statistics from the unmodified CF composite, the interfacial shear strength, interlaminar shear force, impact growth, and 167. 2% all increased by 80. 2%, 23. 5%, and 167. 2%, respectively, and fracture toughness increased by 227. 2 percent.

Source link: https://doi.org/10.3390/nano12173056


Effect of Multi-Walled Carbon Nanotubes and Carbon Fiber Reinforcements on the Mechanical and Tribological Behavior of Hybrid Mg-AZ91D Nanocomposites

Research has been carried out in the present work to improve the magnesium AZ91D hybrid composite's strength by reinforcing carbon fibers and multi-walled carbon nanotubes with various weight percentages. The test findings showed that adding CF and MWCNT reinforcements to the hybrid Mg composite's hardness, tensile strength, and impact strength improved the Mg composite's tensile strength, and impact strength relative to the base Mg matrix. The wear test results also revealed the Mg composite's improved wear resistance in comparison to the base matrix. The wear rate of the AZ91D + 0. 5 percent composite for a load of 30 N at a sliding distance of 1500 m is lower relative to the base matrix. The improved mechanical and tribological stability of the magnesium composite is also due to the homogeneous dispersion of the hard reinforcement particles along the grain boundaries.

Source link: https://doi.org/10.3390/ma15176181


Activated Porous Carbon Fiber: New Adsorbent for Sampling and Analysis by Thermal Desorption of Siloxanes in Biogas and Biomethane

The increasing global energy demand requires continued growth and optimization of alternative energy sources. Waste conversion into biogas and biomethane are two promising energy sources, according to the circular economy approach. Quality control and the use of cleaning up equipment are essential in biomethane's distribution network and energy conversion plants, as well as the use of washing up equipment. The effectiveness of APCF tube was tested in this study by comparing it to common multilayer tube thought sampling and analyzing siloxanes in lab scale and in real scale. This allows us to deduce that APCF is a newer material for the development of a more effective sampling and analysis approach than the existing ones, allowing for greater success in the process of monitoring fuel quality in biomethane production and storage facilities.

Source link: https://doi.org/10.3390/ijerph191710890


Amino-functionalized carbon fiber/polyamide 6 composites with enhanced interfacial and mechanical properties

Polyamines with different amino numbers were introduced on the surface of carbon fiber by a chemical grafting technique to increase the interfacial characteristics of CF/polyamide 6 composites' interfacial properties. On the surface of CF, a carboxyl group was introduced, and polyamine was grafted onto the pretreated CF. The modified CF/PA6 composite's surface contained 18. 92 percent; the interfacial shear strength and tensile strength of the modified CF reached 58. 6%, respectively; which were 41. 5% and 45. 5% higher than those of unmodified CF/PA6 composites.

Source link: https://doi.org/10.1016/j.jmrt.2022.08.112


Evaluating performance of carbon fiber-reinforced pavement with embedded sensors using destructive and non-destructive testing

In Canada, concrete pavement at the curb travel lane at the bus stop is a common way to raise the resistance of bus pads to environmental and petroleum degradation. This paper aggregates the real-time comparison between a carbon fiber-reinforced concrete bus pad and a standard concrete bus pad in this field. In the first ten days of construction, the carbon fiber-enforced bus pad remained cracked free after showing some balling of carbon fibers on the surface of the pavement, whereas normal concrete bus pads showed numerous hairline cracks. CFRC bus pads had remarkably low electrical resistance when compared to traditional concrete bus pads, which have electrical resistivities of about 30 ku03a9-cm. Both Schmidt hammer and UPV reported decline in the regular concrete bus pad in comparison to the CFRC bus pad.

Source link: https://doi.org/10.1016/j.cscm.2022.e01460


The Behavior of RC Beams Retrofitted with Carbon Fiber Reinforced Polymers (CFRP)

Carbon Fiber Reinforced Polymers for strengthening and retrofitting reinforced concrete structures is gaining attention due to its greater flexibility, lightness, tenacity, corrosion resistance, and aesthetic value. In comparison to control specimens, this report reports the results of two enhanced and two retrofitted beams. Using high strength epoxy, two specimens were expanded and two were retrofitted by adding CFRP to the tension side of the beams, and two others were retrofitted. One CFRP strip/wrap simply attached at the tension side will help the damaged beam regain/pass the original strength. The findings show that one CFRP strip/wrap just attached at the tension side will help the damaged beam regain/pass the original strength.

Source link: https://doi.org/10.48084/etasr.4926

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions