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. Critical 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.

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    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.


    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.


    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.


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


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