Modeling of extrinsic defects in silica fibers using Vickers identification

Bochien Lin; Andrew P. Stanzeski; M. John Matthewson

doi:10.1117/12.230101

15 January 1996 Modeling of extrinsic defects in silica fibers using Vickers identification

Bochien Lin, Andrew P. Stanzeski, M. John Matthewson

Proceedings Volume 2611, Optical Network Engineering and Integrity; (1996) https://doi.org/10.1117/12.230101
Event: Photonics East '95, 1995, Philadelphia, PA, United States

Abstract

Vickers indentation has been used to introduce controlled flaws in fused silica optical fiber in order to model the behavior of 'weak' defects encountered in practice. Novel techniques are used in order to conveniently examine indentations over a broad range of residual strength; these include the use of flat fiber which facilitates specimen alignment during indentation and subsequent strength measurement in bending. The strength of indented silica fiber measured in pH 7 buffer reveals a bimodal behavior at the threshold for radial crack formation which is related to the 'pop-in' of radial cracks after indentation or during strength testing. An unusually low value of the stress corrosion parameter for subthreshold indentations of n approximately equals 11 is observed in pH 7 buffer. This suggests that under some conditions the usual assumption of n approximately equals 20 may lead to an overestimation of fiber reliability.

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Bochien Lin, Andrew P. Stanzeski, and M. John Matthewson "Modeling of extrinsic defects in silica fibers using Vickers identification", Proc. SPIE 2611, Optical Network Engineering and Integrity, (15 January 1996); https://doi.org/10.1117/12.230101

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