Volume 27, Issue 2 (March 1999)

    Ultrasonic Measurement of the Dynamic Elastic Moduli of Small Metal Samples

    (Received 29 December 1997; accepted 18 November 1998)

    CODEN: JTEOAD

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    Abstract

    Ultrasonic velocity measurements were used to determine the dynamic elastic moduli of small metal samples to a 2σ measurement uncertainty of better than 1%. The samples were cylindrical in shape, possessing nominal diameters of 12 mm and thicknesses of 6 mm. Aluminum, titanium, and stainless steel compositions were examined. In the longitudinal wave measurements, a 20-MHz quartz piezoelectric element transducer was employed in pulse-echo mode using a tone-burst excitation. These longitudinal time-of-flight measurements were made with a repeatable 2σ measurement uncertainty of ≤1.0 ns. Shear time-of-flight measurements, using a 10-MHz contact ceramic piezoelectric element transducer subjected to tone-burst excitation, were made with a repeatable 2σ measurement uncertainty of ≈2.0 ns. NIST calibration facilities provided measurements for the density and lengths of these samples, as needed for the moduli calculations. Results indicate that the measurement uncertainties for elastic moduli measurements of this type can be kept quite small.


    Author Information:

    Slotwinski, JA
    Manufacturing Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD

    Blessing, GV
    Manufacturing Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD


    Stock #: JTE12056J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12056J

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    Author
    Title Ultrasonic Measurement of the Dynamic Elastic Moduli of Small Metal Samples
    Symposium , 0000-00-00
    Committee E07