A review on corrosion, mechanical, and electrical properties of glass fiber-reinforced epoxy composites for high-voltage insulator core rod applications: challenges and recommendations

Ogbonna, V. E.; Popoola, A. P. I.; Popoola, Olawale; Adeosun, S. O.

doi:10.1007/s00289-021-03846-z

Cited by 35 publications

(11 citation statements)

References 92 publications

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“…Similarly, for good mechanical performance, insulators must have significant strength and durability to withstand adequate dynamic forces in operational conditions. Since complex structures inevitably cause stress concentrations, conducting structural analysis of the pollution-resistant disk suspension porcelain insulators and design optimization are essential to enhancing their safety performance [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Ji,

Li,

Cao

et al. 2024

Materials

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This study aims to enhance the productivity of high-voltage transmission line insulators and their operational safety by investigating their failure mechanisms under ultimate load conditions. Destructive tests were conducted on a specific type of insulator under ultimate load conditions. A high-speed camera was used to document the insulator’s failure process and collect strain data from designated points. A simulation model of the insulator was established to predict the effects of ultimate loads. The simulation results identified a maximum first principal stress of 94.549 MPa in the porcelain shell, with stress distribution characteristics resembling a cantilever beam subjected to bending. This implied that the insulator failure occurred when the stress reached the bending strength of the porcelain shell. To validate the simulation’s accuracy, bending and tensile strength tests were conducted on the ceramic materials constituting the insulator. The bending strength of the porcelain shell was 100.52 MPa, showing a 5.6% variation from the simulation results, which indicated the reliability of the simulation model. Finally, optimization designs on the design parameters P1 and P2 of the insulator were conducted. The results indicated that setting P1 to 8° and P2 to 90.062 mm decreased the first principal stress of the porcelain shell by 47.6% and Von Mises stress by 31.6% under ultimate load conditions, significantly enhancing the load-bearing capacity. This research contributed to improving the production yield and safety performance of insulators.

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Section: Introductionmentioning

confidence: 99%

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Ji,

Li,

Cao

et al. 2024

Materials

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“…42 (No. 1), Feb. 2023 These researches are vital since they inform about diagnostic tools of outdoor polymeric insulators (Nixdorf & Busse, 2001;Thadei, 2010), their conductivity (Thadei & Kyaruzi, 2008;Tuncer & Gubanski, 1999, any damage to the molecular structures (Serdyuk et al, 2002;Tuncer, 2004Tuncer, , 2005, useful to detect ageing effects (Kumara et al, 2022;Seifert et al, 1998), and any presence of mechanical failures of the central rod (Ogbonna et al, 2022). Epoxy resin (ER) forms the polymer matrix (Uflyand et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Studying Dielectric Losses of Serially Combined Silicone Rubber and Epoxy Resin

Mushi

Justo

Kyaruzi

2023

TJET

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High voltage outdoor insulation systems are conventionally ceramics and glass with several advantages, such as proven in the field, excellent dielectric properties, durability, and long life. However, they are heavy, attract vandals and break easily, and they can lose their dielectric properties easily when subjected to high voltage transients, arcing, and surges. To curb this, polymer insulators are used because they have excellent dielectric properties, such as those of ceramics and glass, with the added advantages that they do not break easily and recover their lost dielectric properties after any electrical transients. Therefore, this paper investigates the dielectric properties of polymeric materials – silicone rubber (SR) and epoxy resin (ER). Some SR samples were manufactured in the laboratory, and others were obtained from the industrial manufacturer. All the ER samples were manufactured in the laboratory. The dielectric measurements were performed with the Insulation Diagnostics System. Within the measured frequency ranges, the dielectric losses of SR manufactured industrially differ from the laboratory-manufactured specimens. This is due to filler materials in the industrially manufactured samples. For the case of serially connecting the SR and ER, there was a higher influence of dielectric loss of SR than the ER, with some remarkable dielectric losses at some frequencies.

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“…GF is another high-performance fiber with excellent electrical insulation properties, corrosion resistance, mechanical properties, thermal stability and low cost [ 8 , 9 ]. Glass-fiber reinforced polymer (GFRP) composites are applied in electrical insulation composites, construction, transportation tools, and wind power generation [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

The Long-Term Interfacial Evolution and Prediction of Carbon- and Glass-Fiber-Reinforced Epoxy Hybrid Rods under a Hygrothermal Environment

Liu

Wang

et al. 2023

Polymers

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In order to promote the engineering applications of carbon- and glass-fiber-reinforced epoxy hybrid rods, it is necessary to fully understand its long-term hygrothermal durability. In the present study, the water absorption behaviors of a hybrid rod in a water immersion environment are studied experimentally, the degradation rules of the mechanical properties are obtained, and establishing a life prediction model is attempted. The water absorption of the hybrid rod confirms to the classical Fick’s diffusion model, and the water absorption concentration is determined by radial position, immersion temperature, and immersion time. In addition, the radial position of water molecules diffused into the rod is positively correlated with the diffusion concentration. The short-beam shear strength of the hybrid rod decreased significantly after 360 days of exposure; this is because water molecules interact with the polymer through hydrogen bonds to produce bound water during the immersion process, leading to resin matrix hydrolysis and plasticization, as well as interfacial debonding. In addition, the ingression of water molecules caused degradation in the viscoelastic behavior of the resin matrix in hybrid rods. The glass transition temperature of hybrid rods decreased by 17.4% after exposure at 80 °C for 360 days. The Arrhenius equation was used calculate the long-term life of short-beam shear strength in the actual service temperature based on the time–temperature equivalence theory. The stable strength retention for SBSS was found to be 69.38%, which is a useful durability design parameter for hybrid rods in civil engineering structures.

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A review on corrosion, mechanical, and electrical properties of glass fiber-reinforced epoxy composites for high-voltage insulator core rod applications: challenges and recommendations

Cited by 35 publications

References 92 publications

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Studying Dielectric Losses of Serially Combined Silicone Rubber and Epoxy Resin

The Long-Term Interfacial Evolution and Prediction of Carbon- and Glass-Fiber-Reinforced Epoxy Hybrid Rods under a Hygrothermal Environment

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