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    STP855

    Chevron-Notch Bend Testing in Glass: Some Experimental Problems

    Published: 0


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    Abstract

    This study describes experimental difficulties in the use of the chevron-notch bend test to determine the plane-strain fracture toughness, KIc, for brittle materials. Four-point flexure tests were performed on soda-lime-silica glass and vitreous silica in both “wet” and “dry” environments and at various loading rates. Results show that an inability to produce stable crack growth in the chevron-notch bend test can lead to serious overestimates of KIc as well as to significant scatter in the data. It is also shown that water enhanced crack growth can reduce the measured value of KIc.

    Keywords:

    fracture, glass, chevron notch, bend test, fracture toughness, crack growth


    Author Information:

    Chuck, L
    Mechanical engineer, physicist, and ceramic engineer, National Bureau of Standards, Washington, D.C.,

    Fuller, ER
    Mechanical engineer, physicist, and ceramic engineer, National Bureau of Standards, Washington, D.C.,

    Freiman, SW
    Mechanical engineer, physicist, and ceramic engineer, National Bureau of Standards, Washington, D.C.,


    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP32728S