Resistance to stress corrosion cracking of unidirectional ECR-glass/polymer composites for high voltage composite insulator applications

Kumosa, L.; Kumosa, M.; Armentrout, D.

doi:10.1016/s1359-835x(02)00260-9

Cited by 52 publications

(36 citation statements)

References 26 publications

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“…In the first method, load is applied by a Universal Testing Machine (UTM). Some researchers such as Carpenter and Kumosa et al [7,9], Sapalidis et al [10] and Liaoa et al [11] have used this method. The other method uses weights to exert loading on samples.…”

Section: Loading Typementioning

confidence: 99%

“…In the first method, PH of corrosive medium is adjusted in the beginning of the test with no control during the experiments and PH is measured at the end of the test. Segovia et al [15] and Kumosa et al [6,7,9,17,[20][21][22] in their researches have employed this method. In the second method, concentration of acid is adjusted in the beginning of the test and is controlled periodically, in order to hold PH value constant.…”

Section: Acid Ph Controlmentioning

confidence: 99%

“…This kind of stress corrosion is observed in fluid transfer composite pipes, storage tanks, composite insulators, composite gratings, etc. Several research have been performed on these kinds of structures made of glass fibers and polymers [5][6][7][8][9]. In this research the SCC normalized strength degradation model based on normalized strength degradation model in fatigue of composites is established.…”

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confidence: 99%

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Stress Corrosion Cracking of Basalt/Epoxy Composites under Bending Loading

Shokrieh

Memar

2009

Appl Compos Mater

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The purpose of this research is to study the stress corrosion behavior of basalt/ epoxy composites under bending loading and submerged in 5% sulfuric acid corrosive medium. There are limited numbers of research in durability of fiber reinforced polymer composites. Moreover, studies on basalt fibers and its composites are very limited. In this research, mechanical property degradation of basalt/epoxy composites under bending loading and submerged in acidic corrosive medium is investigated. Three states of stress, equal to 30%, 50% and 70% of the ultimate strength of composites, are applied on samples. High stress states are applied to the samples to accelerate the testing procedure. Mechanical properties degradation consists of bending strength, bending modulus of elasticity and fracture energy of samples are examined. Also, a normalized strength degradation model for stress corrosion condition is presented. Finally, microscopic images of broken cross sections of samples are examined.

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Section: Loading Typementioning

confidence: 99%

Section: Acid Ph Controlmentioning

confidence: 99%

mentioning

confidence: 99%

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Stress Corrosion Cracking of Basalt/Epoxy Composites under Bending Loading

Shokrieh

Memar

2009

Appl Compos Mater

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“…They may undergo stress corrosion and the resulting cracks would reduce the strength of the composite [13][14][15][16][17]. Insufficient information about the stress corrosion of such fibres in various chemically active environments is an obstacle to the widespread use of glass fibre composites in the building industry [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Korozja naprężeniowa w kompozytach epoksydowo-szklanych monitorowana z zastosowaniem emisji akustycznej

Świt

Adamczak

2017

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In the building industry, polymeric matrix composites filled with glass, carbon, graphite, polypropylene, or Kevlar filaments are commonly used. However, it is notable that the wider use of composites is limited by a lack of sound knowledge regarding their properties their responses to exposure to various environments. In this respect, the alkaline and acid environments may have a significant influence on the response of epoxyglass composites which are most commonly in use. They may undergo stress corrosion and the resulting cracks reduce the strength of the composite. Within this work, a method based on acoustic emission measurement is devised which allows the determination of the beginning of cracking and of the intensity of the corrosive cracking of filaments in a loaded composite. This is substantial in terms of the diagnosing of the functioning structures.Keywords: monitoring, acoustic emission, stress corrosion, epoxy-glass composites, destructive processes Streszczenie W budownictwie najczęściej używane są kompozyty z matrycą polimerową wypełnioną włóknami szklanymi, węglowymi, grafitowymi, polipropylenowymi oraz kevlarowymi. Szersze zastosowanie tych materiałów jest jednak ograniczone ze względu na brak dokładnej wiedzy o ich właściwościach i zachowaniu w różnych warunkach ekspozycji i pod różnym typem obciążenia. W literaturze powszechnie istnieje opinia, że kompozyty włókniste na bazie żywic polimerowych są odporne na działanie środowiska zasadowego i kwasowego, co w przypadku uwzględnienia obciążenia tych kompozytów nie jest prawdą. Kompozyty te w wyniku obciążenia mogą ulegać korozji naprężeniowej lub erozji, co powoduje zmniejszenie ich wytrzymałości, a w konsekwencji pękanie. Stosując metodę emisji akustycznej, istnieje możliwość wykrywania i śledzenia procesów korozyjnych w kompozytach na bazie żywic epoksydowych i włókien szklanych, co jest niezmiernie ważne dla bezpieczeństwa użytkowanych konstrukcji.

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“…To avoid potential stress corrosion cracking (SCC) of the glass fiber/epoxy layer in acidic environments [6][7][8][9][10][11], the presently used glass fibers are boron free low-seed ECR fibers [9][10][11]. In particular, a failure process called by international utilities as brittle fracture [11][12][13][14][15] and based on SCC of E-glass fibers in nitric acid solutions is eliminated by using ECR fibers.…”

Section: Introductionmentioning

confidence: 99%