This article discusses the mechanical performance of alumina nanoparticles and randomly distributed short glass/carbon fiber-reinforced hybrid composites through microhardness and wear test. The open mold casting method was adapted to prepare the test coupons. The wear and friction behavior of composites sliding against hardened ground EN 32 steel in a pin-on-disc configuration is evaluated on a wear and friction tester. The microhardness properties of the neat epoxy, alumina nanoparticles, and alumina nanoparticle–embedded glass/carbon fiber–reinforced hybrid composites were determined. The morphology of the worn composites was analyzed with a scanning electron microscope. It was found that the particles as fillers contributed significantly to improve the mechanical properties and wear resistance of the polymer composites. This is because the fillers contributed to enhance the bonding strength between the fiber and the epoxy resin. Moreover, the wear and friction resistance of the glass/carbon fiber composites was increased by increasing the filler weight in the composite materials. © 2015, Copyright © Society of Tribologists and Lubrication Engineers.

Akash Mohanty

Department of Design and Automation

School of Mechanical Engineering

Vellore Campus

Mohanty A

Srivastava V.K.

Vijay K Srivastava

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Tribological Behavior of Particles and Fiber-Reinforced Hybrid Nanocomposites

Tribology Transactions

Electrical properties of Nanodiamond (NDs) with individual diameters of ∼5 nm are important for many engineering applications and drawing significant attention of the current research community. In this paper, we reported a systematic approach to remove sp2 carbon content from NDs particles by annealing method to enhance the interfacial molecular bonding between reinforcement and matrix. X-ray Diffraction (XRD) and Fourier Transform Infra-Red Spectrophotometer (FTIR) studies revealed that annealing of NDs occurs at 450 °C, indicating that the decrease in resistivity is based on the sp2/sp3 carbon ratio of NDs. Thus, it is interesting to study the properties of annealed NDs/epoxy nanocomposites with small filler concentrations varying from 0.1 wt% to 0.5 wt%. In this paper, the Dielectric properties (dielectric constant and dielectric strength), thermal conductivity, impact strength, micro-hardness, and compressive behaviour of NDs/epoxy nanocomposites were investigated. Dispersion of NDs at very low concentration was ensured with the help of UV-vis-NIR absorbance spectra analysis. It was observed that the dielectric constant (ϵ′) was enhanced with NDs loading and reached an optimum value at 0.3 wt% of the loading of NDs whereas the dielectric strength showed a reverse pattern. The thermal conductivity and Izod impact strength showed maximum improvement of 21% and 104.0% respectively at 0.3 wt% NDs loading. © 2019 IOP Publishing Ltd.

Materials Research Express

Study of the mechanical, dielectric, and thermal properties of annealed modified nanodiamond/epoxy composites

Nano scale dispersion due to the size transformation of the reinforced particles from micron size to nano size in the polymer matrix to enhance the mechanical properties of fiber-reinforced hybrid composite is an interesting research topic of the current time. In this study, the nanocomposites test coupons were prepared through the open molding route. The nano scale dispersion is achieved at an optimum concentration of alumina particles (2 wt%), which results in improved thermal stability, impact strength, flexural modulus and flexural strength of composites. The maximum enhancement in impact energy was observed to be 84 % correspond to the addition of 2 wt%, 20 % for the flexural strength correspond to the addition of 3 wt% and 35 % for the flexural modulus correspond to the addition of 5 wt% alumina particles to the epoxy matrix. For the addition of 5 wt% of short glass/carbon fibers to the epoxy, an improvement of 130 % and 170 % for the flexural strength and 55 % and 95 % for the flexural modulus was observed. Furthermore, addition of optimum concentration (i.e. 2 wt%) of alumina nano particle to the 5 wt% glass/carbon fiber reinforced hybrid composites resulted in the improvement of impact properties, flexural strength and flexural modulus of 175 %, 195 %; 18 %, 26 % and 65 %, 85 % as compared to the neat epoxy, and 7 %, 8 %; 82 %, 105 % and 17 %, 5 % as compared to the short fiber reinforced composites. These enhancements in the mechanical properties are mainly due to the better stress transfer properties from fiber and nanoparticle to the matrix, due to the existence of strong interfacial interactions between both epoxy/alumina nanoparticles, which depict the higher resistance to fiber pull out as compare to fiber reinforced composites without alumina nanoparticles. © 2015, The Korean Fiber Society and Springer Science+Business Media Dordrecht.

Fibers and Polymers

Effect of alumina nanoparticles on the enhancement of impact and flexural properties of the short glass/carbon fiber reinforced epoxy based composites

Epoxy/alumina nanocomposites were prepared by reducing micron size alumina into nanosize during the casting process. In our current investigation it was found that, at low concentration alumina nanoparticles exhibit uniform dispersion of alumina nanoparticles in epoxy nanocomposite while at higher concentration they depict aggregation of alumina particle. Since uniform dispersion of alumina nanoparticles results in improved thermal stability and viscoelastic behavior. It leads to remarkable improvement in breakdown voltage, and breakdown time of epoxy/alumina nanocomposites as compared to neat epoxy. Epoxy nanocomposites containing 2. wt.% of alumina particles results in increase of breakdown voltage by 91% and breakdown time by 155% as compared to neat epoxy. Hence, the nanocomposites developed can be used as insulating material in electrical instruments which require high breakdown voltage as well as improved viscoelastic behavior and thermal stability. © 2012 Elsevier Ltd.

Materials & Design

Dielectric breakdown performance of alumina/epoxy resin nanocomposites under high voltage application

Wear

Dry sliding wear behaviour of Mg–Si alloys

Analysis of the effect of nano-roughness on the friction of a vitreous polymer

Journal of the Mechanical Behavior of Biomedical Materials

Carbon fiber reinforced PEEK Optima—A composite material biomechanical properties and wear/debris characteristics of CF-PEEK composites for orthopedic trauma implants

Journal	Tribology Transactions
Publisher	Informa UK Limited
ISSN	1040-2004
Open Access	No