Interface damage driven electrical degradation dynamics of glass fiber-reinforced epoxy composites

Zhao, Rui; Chen, Yun; Li, Jin; Liu, Songtao; Wang, Yu-Huai; Aung, Hein Htet; Kong, Xiaoxiao

doi:10.1016/j.compscitech.2023.109921

Cited by 16 publications

(2 citation statements)

References 18 publications

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“…Previous investigation [ 16 , 17 ] shows that fatigue damage is usually accompanied by interface damage between fiber and matrix. In this study, the results are similar and indicate that the fatigue damage in specimens with initial machining damage around the countersunk hole under cyclic loading is characterized by the generation and expansion of interlaminar cracks, flake damage, and detachment caused by fiber breakage and matrix failure.…”

Section: Three-point Bending Fatigue Test and Analysis Of Cfrp-counte...mentioning

confidence: 99%

Investigation of CFRP-Countersunk Bolted Assembly Fatigue Damage under Three-Point Bending via Experimental and Numerical Analysis

Qin

Wang

et al. 2023

Polymers

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In this research, the fatigue damage behavior under three-point bending of a composite joint incorporating a single countersunk fastener is investigated. Firstly, a self-developed fatigue test system was set up to test the fatigue characteristics of CFRP-countersunk bolted assembly under the displacement amplitude cycles of 103 to 106 to study the formation and expansion rule of damage and cracks. It found two typical damage processes, both of which involve some formal interface damage between fiber and matrix. Based on the experiment, a finite element fatigue damage analysis on this assembly was carried out according to the Hashin failure criterion. The simulation result shows an identical fatigue damage location and fatigue life with the experimental phenomenon. Moreover, it predicted the final fatigue life of the specimen under 10 hz cyclic loading with 1 mm displacement and 10 Nm bolt preloading. This research provides guidance for the engineering fatigue issues of single-bolted joint composite connection structures and provides a reference for the corresponding technical specifications formulation.

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Section: Three-point Bending Fatigue Test and Analysis Of Cfrp-counte...mentioning

confidence: 99%

Investigation of CFRP-Countersunk Bolted Assembly Fatigue Damage under Three-Point Bending via Experimental and Numerical Analysis

Qin

Wang

et al. 2023

Polymers

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“…In addition, due to the smooth surface caused by high crystallinity of aramid fiber, the mechanical interlocking between the fibers and matrix is weak [7]. These above reasons lead to insufficient impregnation of AFRC, which may cause defects such as dry spots and voids easily [8,9]. Under the combined action of electrical and mechanical stresses, the defective part of insulation rod would lead to partial discharge and even insulation breakdown [10,11].…”

Section: Introductionmentioning

confidence: 99%

Improved dielectric and mechanical properties of aramid fiber reinforced epoxy resin composites by polyethyleneimine grafting

Du,

Xue,

Kong

et al. 2023

J. Phys. D: Appl. Phys.

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In this paper, aramid fiber surface is modified by polyethylenimine (PEI) grafting with abundant -NH2 active groups after plasma surface activation treatment. Various aramid fiber reinforced epoxy resin composites (AFRC) are prepared. The effects of PEI grafting on the dielectric and mechanical properties of AFRC are studied. Obtained results show that PEI is successfully grafted onto aramid fiber surface as evidenced by XPS results, and effectively improves the interfacial properties between aramid fiber and epoxy resin. The dielectric properties, including DC conductivity, dielectric constant, and integration charge Q(t) of the composites are improved after appropriate modification, and the breakdown strength is increased by up to 23%. These are attributed to the decrease in interfacial polarization and the increase in interfacial bonding strength. Furthermore, the interfacial shear strength of AFRC is increased from 29.5 MPa to 63.7 MPa, which further verifies the improvement of interfacial performance. This paper provides a way to improve the dielectric and mechanical properties of aramid fiber reinforced epoxy resin composites, which is of great significance for its application in high voltage power equipment.

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Enhanced interface electrical insulation of aramid‐reinforced resin composites via iron phthalocyanine self‐assembled structures on the surface of aramid

Xie,

Zhang,

Xia

et al. 2024

Polymer Composites

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Aramid fiber‐reinforced epoxy resin composites (AFRP) are the main components of electrical equipment such as GIS insulated tie rods, but the poor interfacial bonding between aramid fibers (AF) and epoxy resin (EP) results in a degradation of the material's insulating properties. In this paper, iron phthalocyanine (FePc) molecules are introduced on the AF surface, and the π‐π interaction effect between the metal phthalocyanine rings is used as a driving force to guide the spontaneous assembly of FePc into a three‐dimensional microstructure, and the effect of microstructures with different FePc contents on the insulating properties of AFRP interfaces is investigated. Combining a series of test simulation methods such as surface potential attenuation test, electric tree test, interlayer shear test, and molecular dynamics simulation, reveals the enhancement mechanism of the electrical insulation performance of the interface. The results show that FePc at four contents has an enhancement effect on the flashover voltage along the AF and the breakdown voltage at the AFRP interface, with a maximum enhancement of 25.63% for the flashover voltage and 232.23% for the breakdown voltage.Highlights Self‐assembled three‐dimensional structures on aramid surfaces were constructed via iron phthalocyanine molecules. The effects of self‐assembled structures on physicochemical properties are compared. Modifications substantially increase the breakdown voltage and flashover voltage. The mechanism of microstructure on interface breakdown voltage enhancement is revealed. The overall effect of multiple factors on insulation properties is analyzed.

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Interface damage driven electrical degradation dynamics of glass fiber-reinforced epoxy composites

Cited by 16 publications

References 18 publications

Investigation of CFRP-Countersunk Bolted Assembly Fatigue Damage under Three-Point Bending via Experimental and Numerical Analysis

Investigation of CFRP-Countersunk Bolted Assembly Fatigue Damage under Three-Point Bending via Experimental and Numerical Analysis

Improved dielectric and mechanical properties of aramid fiber reinforced epoxy resin composites by polyethyleneimine grafting

Enhanced interface electrical insulation of aramid‐reinforced resin composites via iron phthalocyanine self‐assembled structures on the surface of aramid

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