Abstract

Hydrolysis resistance of boron-free E-glass fiber with different total iron oxide (Fe2O3) concentrations, iron redox index and durations of fiber ageing up to 180 days at 50◦C with 50% relative humidity (RH) was studied. The effect of ageing on the fibre failure measured in two different test environments was examined by using two-point bending method. Based on the differences in failure strains of the fibres obtained from the two conditions as a function of ageing time, the Griffith theory of solid fracture was applied to estimate glass surface energy difference in ageing conditions. The results showed that stress-assisted hydrolysis, when the fibres were under stress, could lead to about 5.18 times reduction in surface energy to account for 2.30 times reduction in fibre failure strain when tested in 50% RH at room temperature. Our study showed that the boron-free E-glass aged up to 180 days only deteriorated within 13%, independent of total Fe2O3 concentration and FeO/Fe2O3 total ratio, and stress-assisted hydrolysis played a key role during sample testing. Dynamic fatigue of the aged E-glass fibers was also investigated, showing little influence of total Fe2O3 concentration and FeO/Fe2O3 total ratio on fiber stress; corrosion susceptibility was observed.

Department(s)

Materials Science and Engineering

Comments

PPG Industries, Grant 201306635001

Keywords and Phrases

Ageing; Failure strain; Glass fibre; Hydrolysis; Iron oxide; Surface energy

International Standard Serial Number (ISSN)

0973-7669; 0250-4707

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2024 Learned Society, All rights reserved.

Publication Date

01 Aug 2017

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