STP733: Multiple-Mist Regions on Glass Fracture Surfaces

    Abdel-Latif, AIA
    Supervisor, Materials Engineering, General Electric Co., Valley Forge Space Division, Philadelphia, Pa.

    Bradt, RC
    Professor of Ceramic Science and Engineering and head, Department of Materials Science and Engineering, and associate professor of Ceramic Science and Engineering and Chairman, Ceramic Science Program, Pennsylvania State University, University Park, Pa.

    Tressler, RE
    Professor of Ceramic Science and Engineering and head, Department of Materials Science and Engineering, and associate professor of Ceramic Science and Engineering and Chairman, Ceramic Science Program, Pennsylvania State University, University Park, Pa.

    Pages: 12    Published: Jan 1981


    Abstract

    Observations of the formation of multiple-mist regions on the fracture surfaces of soda-lime-silicate and fused silica glasses are reported. These regions occur only in high-strength specimens. The same empirical equation that is applicable to the basic fracture mirror-primary mist also describes secondary and tertiary mist regions, although the proportionality constants increase as the order of the mist region increases. Results suggest that these mist radii constants may be related in specific ratios, which decrease with successive mist regions. Criteria of mist-region formation are reviewed with respect to additional restrictions imposed by the consideration of multiple mists. The authors suggest that an energy criterion is most applicable, and a schematic diagram is proposed.

    Keywords:

    fractography, fracture mirrors, fracture mist, fused silica, glass, hackle lines, materials, materials science, mirror constants, soda-lime-silicate glass


    Paper ID: STP33435S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP33435S


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