STP1380

    Maintaining the Accuracy of Charpy Impact Machines

    Published: Jan 2000


      Format Pages Price  
    PDF Version (388K) 12 $25   ADD TO CART
    Complete Source PDF (8.5M) 12 $136   ADD TO CART


    Abstract

    The quality of the data developed by impact machines tends to degrade over time, due to the effects of wear and vibration that are inherent in the test. This is the reason that impact standards specify periodic direct and indirect verification tests. Each year, we provide reference specimens for indirect verification of over 800 machines around the world. From evaluation of the absorbed energies and the fractured specimens, we are able to deduce the origin of energies that are outside the allowed ranges, and report these observations back to the machine owners. This report summarizes the basis for these observations and will allow, it is hoped, machines to be maintained at higher levels of accuracy.

    Keywords:

    absorbed energy, Charpy V-notch, impact test, machine repair, misalignment, verification testing, worn anvils


    Author Information:

    Vigliotti, DP
    Technician, Group Leader, and Metallurgist, National Institute of Standards and Technology, Boulder, Colorado

    Siewert, TA
    Technician, Group Leader, and Metallurgist, National Institute of Standards and Technology, Boulder, Colorado

    McCowan, CN
    Technician, Group Leader, and Metallurgist, National Institute of Standards and Technology, Boulder, Colorado


    Paper ID: STP14391S

    Committee/Subcommittee: E28.07

    DOI: 10.1520/STP14391S


    CrossRef ASTM International is a member of CrossRef.