Strength, Toughness And Fracture Initiation Of Fluoride Glasses

Carl C.M. Wu; Dave Lewis; Karl R. McKinney

doi:10.1117/12.943145

16 October 1984 Strength, Toughness And Fracture Initiation Of Fluoride Glasses

Carl C.M. Wu, Dave Lewis, Karl R. McKinney

Proceedings Volume 0484, Infrared Optical Materials and Fibers III; (1984) https://doi.org/10.1117/12.943145
Event: 1984 Technical Symposium East, 1984, Arlington, United States

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.

Citation Download Citation

Carl C.M. Wu, Dave Lewis, and Karl R. McKinney "Strength, Toughness And Fracture Initiation Of Fluoride Glasses", Proc. SPIE 0484, Infrared Optical Materials and Fibers III, (16 October 1984); https://doi.org/10.1117/12.943145

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