ASTM C1607 Checking the Suitability of Ceramicware for use in Microwave

ASTM C1607 estimates the fracture toughness of ceramic glassware to determine their suitability for use in microwaves. C ritical mechanical properties like hardness, toughness, and elastic modulus can be measured very precisely by this method. The ceramic glassware is also assessed for thermal shock resistance.... Read More

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    Scope:

    ASTM C1607 method is a convenient tool to estimate and evaluate fracture toughness and the related mechanical parameters of brittle materials on a small scale. It does not require a large sized sample.

    Procedure:

    For ASTM C1607, a traverse scratch is placed in the center of the flexure specimen, and then the specimen is inserted inside the bridge pre-cracker. A crack is produced across the cross-section of the sample and the sample is broken to four-points flexural loading. The crack produced is analyzed on the fracture surface after the fracture happens. Fracture toughness is evaluated by checking a stress intensity shape factor, the critical crack size, and fracture force. After the fracture, a stereo optical microscope is used for testing the cracks.

    Specimen Size : 

    In ASTM C1607 the sample size varies from micrometers to millimeters.

    Data:

    Crack size is measured in millimeters, and the fracture force is measured in newton. The given formula calculates fracture toughness for ASTM C1607:

    KIC=Yσ√ a

    Y denotes stress intensity shape factor 

    σ denotes flexure strength at fracture 

    a denotes precrack depth

    Ceramic glassware generally has lower KC values than metals and ranges from 0.6 to 0.8MPa.

    Conclusion:

    ASTM C1607 estimates the fracture toughness of ceramic glassware to determine their suitability for use in microwaves.

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