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Proceedings Paper

Strength, Toughness And Fracture Initiation Of Fluoride Glasses
Author(s): Carl C.M. Wu; Dave Lewis; Karl R. McKinney
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Paper Abstract

A ZBLAL fluoride glass produced at NRL was characterized mechanically both in bulk and fiber forms. Fracture toughness measurements gave Ki values of 0.38 ± 0.05 MPa.m1/2, about 1/2 that of Si02 glasses. Flexural strength of machined bars of the current ZBLAL glasses was about 60MPa, about 80% of similarly finished silicate glasses. While the fluoride glass has lower strength than Si02 glass, it had much less slow crack growth, which should give it a longer useful life over a range of stresses. Although the average tensile strength of fibers from initial fiber drawing trials was only about 170 MPa, fractographic examinations indicated that the useful strength of this fiber could be raised considerably with improved processing.

Paper Details

Date Published: 16 October 1984
PDF: 5 pages
Proc. SPIE 0484, Infrared Optical Materials and Fibers III, (16 October 1984); doi: 10.1117/12.943145
Show Author Affiliations
Carl C.M. Wu, Naval Research Laboratory (United States)
Dave Lewis, Naval Research Laboratory (United States)
Karl R. McKinney, Naval Research Laboratory (United States)

Published in SPIE Proceedings Vol. 0484:
Infrared Optical Materials and Fibers III
Paul Klocek, Editor(s)

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