SYMPOSIA PAPER Published: 01 January 2000
STP14391S

Maintaining the Accuracy of Charpy Impact Machines

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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.

Author Information

Vigliotti, DP
National Institute of Standards and Technology, Boulder, Colorado
Siewert, TA
National Institute of Standards and Technology, Boulder, Colorado
McCowan, CN
National Institute of Standards and Technology, Boulder, Colorado
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Details
Developed by Committee: E28
Pages: 134–145
DOI: 10.1520/STP14391S
ISBN-EB: 978-0-8031-5429-2
ISBN-13: 978-0-8031-2864-4