Monitoring Crack Extension in Fracture Toughness Tests by Ultrasonics

    Volume 4, Issue 6 (November 1976)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 8


    Klima, SJ
    Materials research engineers, National Aeronautics and Space Administration Lewis Research Center, Cleveland, Ohio

    Fisher, DM
    Materials research engineers, National Aeronautics and Space Administration Lewis Research Center, Cleveland, Ohio

    Buzzard, RJ
    Materials research engineers, National Aeronautics and Space Administration Lewis Research Center, Cleveland, Ohio

    Abstract

    An ultrasonic method was used to observe the onset of crack extension and to monitor continued crack growth in fracture toughness specimens during three-point bend tests. A 20-MHz transducer was used with commercially available equipment to detect average crack extension less than 0.09 mm. The material tested was a 300-grade maraging steel in the annealed condition. A crack extension resistance curve was developed to demonstrate the usefulness of the ultrasonic method for minimizing the number of tests required to generate such curves.


    Paper ID: JTE11370J

    DOI: 10.1520/JTE11370J

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    Author
    Title Monitoring Crack Extension in Fracture Toughness Tests by Ultrasonics
    Symposium , 0000-00-00
    Committee E07