Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Maintaining the Accuracy of Charpy Impact Machines

Published

Author(s)

D P. Vigliotti, Thomas A. Siewert, Christopher N. McCowan

Abstract

The quality of the data developed by impact machines tends to degrade over time, due to the effects of weear 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 the observations and will allow, it is hoped, machines to be maintained at higher levels of accuracy.
Citation
ASTM Special Technical Publication

Keywords

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

Citation

Vigliotti, D. , Siewert, T. and McCowan, C. (2000), Maintaining the Accuracy of Charpy Impact Machines, ASTM Special Technical Publication, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851304 (Accessed June 14, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created May 1, 2000, Updated February 17, 2017