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In this study, hexagonal boron nitride coated ZnO particles were firstly prepared by sol-u2013gel technique and BN@ZnO composite laminates were firstly produced by mold pressing process. The effects of BN@ZnO on composite laminates' impact strength, model II interlaminar fracture toughness, and thermal conductivity are investigated. At 25 and 90 percent respectively, the thermal conductivity of the 10 wt% BN@ZnO coated composite laminates has been increased by 78% and 90%. The model II interlaminar fracture toughness of 2 wt% BN@ZnO composite laminates is 15. 4% higher than pure laminate, with 2 wt% BN@ZnO composite laminates reaching 15. 4% higher than pure laminate.
Continuous carbonu2010fiberu2010reinforced composites can be produced by continuous filament weaving technology, providing sandwich structures with high mechanical stability and good mechanical results. To improve the bonding properties between printing threads, a novel fiber-u2010interleaved printing technique has been suggested in this study. Flatwise compression tests were conducted to compare sandwich structures' mechanical results with the fiberu2010adjacent and fiberu2010interleaved cores. Fiber pull out and breakage, delamination, local core crushing, fiber/matrix, and panel/core debonding were among the key failure modes under these loading conditions, according to a Fractographic review, the key failure modes under these load conditions included fiber pullu2010 out and breakage, delamination, fiber/matrix, and panel/core debonding.
Source link: https://onlinelibrary.wiley.com/doi/10.1002/pc.27221
It has been tested that thin ply could enhance the mechanical properties of carbon fiber reinforced epoxy composite laminates laminates. Thinning ply can prevent the crack from expanding, and the sample's time from crack opening to fracture is longer than that of the thick ply one. The crack mainly expanded in the matrix along the loading direction for thin-u2010ply laminate, according to Morphologies of the fractures, although the crack appeared in the fiber cluster for thick laminates.
Source link: https://onlinelibrary.wiley.com/doi/10.1002/pc.27212
The fiber sample's characteristics, including combustibility, rigidity, thermal conductivity, and the color of the fabric sample all influence composite materials' flammability characteristics. Although the influence of phosphorus-based fire retardants on the flammability characteristics of glass fiber-u2010 composite materials has been well investigated, it is also necessary to know the effects of these fire retardants on carbon fiberu2010based composite materials' flammability characteristics. In samples containing MPP, AlPi, and DOPO, an increase in LOI value is detected. With the addition of all tested phosphorus compounds, MLC results indicate that the lower peak heat release rate and total heat evolved values are obtained. Both in the condensed and gas phases, apart from DOPO, which largely occurs in the gas phase, the tested phosphorus compounds show flame retardant activity.
Source link: https://onlinelibrary.wiley.com/doi/10.1002/fam.3126
Experimentally and numerically compare the present study's aim is to produce, produce carbon fiber reinforced polymer sandwich panels with rhombus cores and investigate their modal behavior by comparing with the traditional elliptical sandwich panel configuration. The natural frequencies of the sandwich structures with rhombus are much higher than those of the elliptical sandwich structures under free-u2013free boundary conditions and equal relative density of the truss cores, according to the experimental findings.
Source link: https://onlinelibrary.wiley.com/doi/10.1002/pc.27201
Carbon fiber reinforcement in structural batteries and capacitors can be enhanced by increasing the surface quality of these materials, which can be further advanced. We provide a step by which we introduce electrochemical surface treatments to attach ferrocene containing polymers to the carbon fiber surface. Compared to a control group, the ferrocene-u2010containing polymers significantly raises the interfacial shear strength in an epoxy resin and increases the fiber's tensile strength by more than 10%.
Source link: https://onlinelibrary.wiley.com/doi/10.1002/pc.27214
Composites made from carbon fibers and fibre reinforced composites have outstanding mechanical stability while still maintaining a low density. However, carbon fibers and their composites have notably high production prices, which place limits on their use areas. To extend the application opportunities of carbon fibers, it is also important to reduce the processing time during their thermal conversion steps and ultimately reduce production costs. Not only can partial stabilization steps be skipped, but the initiation temperature of the stabilization reactions can also be reduced, meaning that stabilization can be carried out at lower temperatures, resulting in reduced energy and cost savingss, but also decreases in energy and cost reductions.
Additive manufacturing has a new exciting promise for carbon fiber-u2010reinforced polymers. Additive manufacturing of CFRPs combines the benefits of additive manufacturing, such as customization, minimal wastage, low cost, fast prototyping, and rapid manufacturing with high specificity of carbon fiber, allowing for high specific strength of carbon fiber. The article gives an overview of commercially available methods for manufacturing short and continuous CFRPs, as well as insights into various additive manufacturing processes. Mechanical analysis and analytical methods were also discussed in the literature on CFRPs in this study.
This investigation looked at the behavior of slabs made with low compressive strength concrete without reinforcements under the influence of sudden dynamic impact loading. The experimental investigation revealed that the placement of the CFRP strips adhered to the concrete slabs for strengthening purposes and anchors in the strips was among the variables investigated. With the authors' free weight drop test device, a constant energy level of impact loading was applied to the concrete slab test specimens. Comments on the concrete slabs were made about the strengthening technique used to the slab test specimens, as well as the accelerationu2010time, displacementu2010time, strainu2010time, u2010time, and strainu2010time. The strengthening technique used with fan-u2010style anchored CFRP strips significantly improved and enhanced the concrete slabs made with low-u2010strength concrete within the scope of the research.
A nanostructured interphase was created by a thermothermal process that was used to deposit copper nanostructures on woven carbon fibers to produce a nanostructured interphase with an epoxy resin matrix. Using a drop-down impact test and universal material testing device, CuOu2010coated WCF reinforced epoxy resin composite samples' mechanical properties such as impact strength and tensile strength were determined. Because of the increase in interfacial surface area between the matrix and the fiber by CuO nanostructures, this research shows that the development of CuO nanostructures can reduce composite delamination and improve composite stability while also expanding the number of structural uses for these materials.
Source link: https://onlinelibrary.wiley.com/doi/10.1002/pc.27205
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