Effect of aging on the failure characteristics of E-glass fibers

Zero stress aging in notched multi‐component glass fibers

“…There are two significant differences between the study by Wang et al and the present one. Therefore, it is not surprising that the present results differ from those of Wang et al 22 One might be tempted to argue that competing degradation and strengthening mechanisms operate in the aged fibers, and indeed, Figures 4 and 6 display classic features of condensate bridging. They performed aging experiments up to 6 months, but observed the majority of strength degradation after only 7 days.…”

“…Based on a previous study by Wang et al on aging of boron-and fluoride-free E-glass fibers, 22 it was expected that aging in humid conditions (Figures 4,5) would lead to a decrease in strength. However, no measurable difference in strength between aged and un-aged fibers was observed ( Figure 8).…”

“…[15][16][17] While there is a reasonable understanding of the chemical durability of a wide variety of glass, 18 the connection between the chemical durability and the change in critical flaw size has not been extensively explored, especially for the case of multicomponent glasses, including E-glass and soda-lime silicate glass. 22,23 Zero stress aging of E-glass has been observed 19,20,22 and has been correlated to the increase in fiber surface roughness features that are likely calcium carbonate. Recently F-and B-free E-glass fibers have been produced to increase corrosion resistance in acid environments.…”

“…Strengthening has also been reported for cracks growing in the presence of humidity near the fatigue limit, an effect due to toughening. [19][20][21][22] The aging mechanisms in multicomponent | 6553 VAN SANT eT Al. glasses are expected to be different from those in pure silica because of the lower glass network connectivity and the relatively high mobility of alkali and alkaline earth species in multicomponent glasses. [19][20][21][22] The aging mechanisms in multicomponent | 6553 VAN SANT eT Al. glasses are expected to be different from those in pure silica because of the lower glass network connectivity and the relatively high mobility of alkali and alkaline earth species in multicomponent glasses.…”

“…[19][20][21][22] The aging mechanisms in multicomponent | 6553 VAN SANT eT Al. glasses are expected to be different from those in pure silica because of the lower glass network connectivity and the relatively high mobility of alkali and alkaline earth species in multicomponent glasses. 20,22 It is not known how a pre-existing flaw population evolves during aging. 22,23 Zero stress aging of E-glass has been observed 19,20,22 and has been correlated to the increase in fiber surface roughness features that are likely calcium carbonate.…”