STP1248: The Production of Calibration Specimens for Impact Testing of Subsize Charpy Specimens

    Alexander, DJ
    Oak Ridge National Laboratory, Oak Ridge, TN

    Corwin, WR
    Oak Ridge National Laboratory, Oak Ridge, TN

    Owings, TD
    Retired from Oak Ridge National Laboratory,

    Pages: 7    Published: Jan 1995


    Abstract

    Calibration specimens have been manufactured for checking the performance of a pendulum impact testing machine that has been configured for testing subsize specimens, both half-size (5.0 × 5.0 × 25.4 mm) and third-size (3.33 × 3.33 × 25.4 mm). Specimens were fabricated from quenched-and-tempered 4340 steel heat treated to produce different microstructures that would result in either high or low absorbed energy levels on testing. A large group of both half- and third-size specimens were tested at -40°C. The results of the tests were analyzed for average value and standard deviation, and these values were used to establish calibration limits for the Charpy impact machine when testing subsize specimens. These average values plus or minus two standard deviations were set as the acceptable limits for the average of five tests for calibration of the impact testing machine.

    Keywords:

    impact testing, calibration, subsize specimens


    Paper ID: STP14655S

    Committee/Subcommittee: E28.07

    DOI: 10.1520/STP14655S


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