Impact of Drawing Stress on the Tensile Strength of Oxide Glass Fibers

The sources of the tensile strength and fracture of both continuous glass fibers and discontinuous wool fibers are explored in terms of structural anisotropy, enthalpy relaxation, defect orientation, and surface inhomogeneities. The fibers are spun from the E‐glass and the basaltic glass melts, resp...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2010-10, Vol.93 (10), p.3236-3243
Main Authors: Lund, Majbritt D., Yue, Yuanzheng
Format: Article
Language:English
Subjects:
Anisotropy
Annealing
Axial stress
Ceramics
Continuous fibers
Defects
Fibers
Fibres
Fractures
Glass
Glass fibers
Oxides
Stress state
Tensile strength
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Summary:The sources of the tensile strength and fracture of both continuous glass fibers and discontinuous wool fibers are explored in terms of structural anisotropy, enthalpy relaxation, defect orientation, and surface inhomogeneities. The fibers are spun from the E‐glass and the basaltic glass melts, respectively. It is revealed that axial stress plays an important role in enhancing the strength of the oxide glass fibers. The increase of axial stress leads to the increase of both the structural anisotropy and the defect (flaws, bubbles, striae, etc.) orientation, and hence the increase of the tensile strength. Besides the axial stress, the increase of the cooling rate also increases the tensile strength of the continuous fibers. These findings are further substantiated by annealing experiments on both continuous and wool fibers below Tg. The onset annealing temperature of the tensile strength decay is close to that of the anisotropy relaxation of the continuous fibers. The relative contributions of the different factors to the fiber strength are schematically scaled with the help of the sub‐Tg annealing.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2010.03879.x