Volume 31, Issue 2 (March 2003)

    Ultrasonic Attenuation and Velocity in Pearlitic Rail Steel During Fatigue Using Longitudinal Wave Probing

    (Received 30 May 2002; accepted 1 October 2002)

    CODEN: JTEOAD

      Format Pages Price  
    PDF 8 $25   ADD TO CART


    Abstract

    A computer-controlled narrowband ultrasonic pulser/receiver system was used to determine changes in the coefficient of attenuation and the acoustic velocity in pearlitic steel specimens during reverse bending fatigue. The specimens were interrogated through their length, in a direction normal to the loading and crack formation planes, using longitudinal wave bursts at 5 MHz. The ultrasonic data are compared with microscopic observations of microcracks in the fatigue-damaged zone and the fractured surfaces. The pattern in which attenuation evolves with respect to fatigue life is found to be sensitive to the onset of microcracks but appears to be unaffected by the magnitude of fatigue load, number of cracks causing failure, prior low-load fatigue history, or the hardness of the specimen. The change in velocity is found to be more pronounced during the early stages of fatigue than during the more advanced stages. It appears to be insensitive to microcracks but sensitive to stress accumulation and dislocation pileup.


    Author Information:

    Kenderian, S
    The Johns Hopkins University, Center for Nondestructive Evaluation, Baltimore, MD

    The Johns Hopkins University, Baltimore, MD

    Berndt, TP
    NASA Langley Research Center, Nondestructive Evaluation Sciences Branch, Hampton, VA

    Green, RE
    The Johns Hopkins University, Center for Nondestructive Evaluation, Baltimore, MD

    The Johns Hopkins University, Baltimore, MD

    Boro Djordjevic, B
    The Johns Hopkins University, Center for Nondestructive Evaluation, Baltimore, MD


    Stock #: JTE12417J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12417J

    ASTM International is a member of CrossRef.

    Author
    Title Ultrasonic Attenuation and Velocity in Pearlitic Rail Steel During Fatigue Using Longitudinal Wave Probing
    Symposium , 0000-00-00
    Committee E07