The effect of hygrothermal aging and UV radiation on the low-velocity impact behavior of the glass fiber-reinforced epoxy composites

Doğan, Akar; Arman, Yusuf

doi:10.1007/s13726-019-00690-x

Cited by 37 publications

(16 citation statements)

References 26 publications

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“…The energy of the carriers decreases during the process of sinking and colliding with the bonding layer, and the free path becomes shorter. [16,29] The conductive channel is blocked, the charge is stagnated, and the material is deteriorated. Second, it can be seen from Figures 3 and 4 that the glass fiber has been precipitated from the matrix on the surface of the sample after long-term aging.…”

Section: Charge Dissipation and Trap Distributionmentioning

confidence: 99%

“…Meanwhile, composite material will deteriorate and generate many free radicals during the electrical aging process. In Reference [16], Dogan studied the effects of damp heat and ultraviolet radiation aging on glass fiber-reinforced epoxy resin composites, and reported that when damp heat and ultraviolet aging work together, the tensile strength and tensile modulus of the material decrease the most, and the material deteriorates the most. In addition, flashover along the surface is one of the important reasons for accelerating material degradation.…”

Section: Introductionmentioning

confidence: 99%

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Thermal‐aging characteristics of epoxy/glass fiber composite materials fordry‐typeair‐core reactors

Bian

Xia

et al. 2021

Polymer Composites

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In recent years, dry-type air-core reactors have frequently experienced inter-turn short circuits due to the aging of the inter-turn insulation. In this paper, we prepared epoxy/glass fiber samples and carried out an accelerated thermal aging test up to 840 hours. In different stages of aging, we tested the surface insulation properties, dielectric properties, thermal and mechanical properties of the samples. The results show that: Flashover voltage drops significantly, and when aging for 35 days, it has dropped by 12.4%. This is because aging is accompanied by the conversion of shallow traps to deep traps and the reduction of conductive channels, which slows down the charge dissipation rate and decreases the flashover voltage. Dielectric, thermal, and mechanical properties also show a deteriorating trend. Through the analysis of the changes in thermal and mechanical properties, it is inferred that thermal aging will damage the epoxy matrix more than the glass fiber. In addition, combined with the scanning electron microscope, Fourier transform infrared spectrometer, and X-ray photoelectron spectrometer characterization results, we believed that the main reason for the material deterioration is the detachment of the glass fiber and the break of the long chain of the matrix. This article has certain reference value for the subsequent engineering application and online monitoring of this material.

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Section: Charge Dissipation and Trap Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal‐aging characteristics of epoxy/glass fiber composite materials fordry‐typeair‐core reactors

Bian

Xia

et al. 2021

Polymer Composites

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“…This drop in rigidity is attributed to photochemical degradation, fissure, plasticization, and water molecules in the interface between fiber-matrix. 42,45 However, the addition of MWCNT in the jute composite produced a reduction in rigidity of approx. 16% after 500 and 28% after 1000 h exposure, when compared to the unexposed jute + MWCNT.…”

Section: Effect Of Aging On the Tensile Properties Of Compositesmentioning

confidence: 99%

Effect of ultraviolet radiation and water spraying on the mechanical properties of multi‐walled carbon nanotubes reinforced natural fiber and hybrid composites

Neto

Queiroz

Cavalcanti

et al. 2021

J of Applied Polymer Sci

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The main objective of this study was to investigate the effect of aging by ultraviolet radiation and water spray on the mechanical properties of natural fiber and hybrid composites. Pure jute, hybrid jute/glass, and glass fiber‐reinforced composites were fabricated. All these types of composites were further modified with 0.6 wt% of multi‐walled carbon nanotubes (MWCNTs) and their mechanical behavior was compared to the unmodified specimens. Tensile and flexural tests were used to measure the mechanical properties of unaged (control) and aged specimens. A scanning electron microscopy analysis was used to examine the fracture surfaces of the specimens tested. It was found that the aging process affected the mechanical properties of the composites studied in different ways. For jute and jute + MWCNT composites the properties decreased with increased exposure time. The hybrid jute/glass composites (unmodified and MWCNT modified) were less affected by aging and showed an insignificant change in tensile strength. The hybrid + MWCNT composites, showed an increase of approx. 7% in Young's modulus (1000 h) and 9% (500 h) and 17%, (1000 h) in flexural modulus when compared to the unexposed specimens. The MWCNTs had a positive effect on the mechanical properties of the glass + MWCNT aged samples.

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“…The combined action of elevated temperature and moisture absorption caused chemical alteration and delamination in the material. Dogan and Arman [45] investigated the effect of UV radiation and hygrothermal conditions on glass/epoxy composites. The results showed a reduction of tensile strength by 24% and 10%, respectively, after exposure to 70 C (70% humidity) with UV radiation for 1500 h and without aging.…”

Section: Introductionmentioning

confidence: 99%

Aging of bolted joints prepared from electron‐beam‐cured multiwalled carbon nanotube‐based nanocomposites with variable torques

et al. 2021

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We evaluate the behavior of a bolted joint prepared from electron beam (EB)-cured carbon/epoxy nanocomposites under accelerated weathering environment at varying bolt tightening torques. For strength improvement, different weight percentages (wt%) of multiwalled carbon nanotubes (MWCNTs) in the range 0.1-0.5 wt% were incorporated into the composite laminates; 0.3 wt % of MWCNT had the maximum tensile strength. The properties of EB-cured composites were compared with those of thermally cured ones. For accelerated weathering, cyclic exposure of ultraviolet (UV) radiation as well as condensation at elevated temperatures was conducted for 1000 h on the nanocomposite specimens. The chemical, physical, thermal, and mechanical properties of the nanocomposites were studied under accelerated aging conditions. To determine the failure loads in the bolted joints, specimens were prepared as per ASTM D5961. It was found that after 1000 h of aging, there was only 5% reduction in the ultimate failure load for joints prepared with the addition of MWCNTs. It was also found that the bolt torque had a positive effect on the performance of the joints. The experimental results were validated with progressive damage analysis using the characteristic curve method along with the Hashin damage criteria.

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The effect of hygrothermal aging and UV radiation on the low-velocity impact behavior of the glass fiber-reinforced epoxy composites

Cited by 37 publications

References 26 publications

Thermal‐aging characteristics of epoxy/glass fiber composite materials fordry‐typeair‐core reactors

Thermal‐aging characteristics of epoxy/glass fiber composite materials fordry‐typeair‐core reactors

Effect of ultraviolet radiation and water spraying on the mechanical properties of multi‐walled carbon nanotubes reinforced natural fiber and hybrid composites

Aging of bolted joints prepared from electron‐beam‐cured multiwalled carbon nanotube‐based nanocomposites with variable torques

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