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.

Analysis of Charpy impact verification data: 1993-2003



Jolene D. Splett, Christopher N. McCowan


Indirect verification tests, used to verify the performance of Charpy impact machines according to ASTM Standard E23, are evaluated by the National Institute of Standards and Technology (NIST) and the data from these tests are co1lected in a database. The data include the capacity and the pendulum design of the impact machine, the energy obtained for each specimen tested, the reference energy for the specimen lot tested, and the test date. The principal use of this data is to track the performance of individual impact machines. However, the data also provide an opportunity to evaluate existing and proposed requirements for the indirect verification of Charpy impact machines. The results of more than 16,000 verification tests are used to compare the current verification requirements of ASTM Standard E23 with those ISO Standard 148-2. Discussions focus on the identification of reasonable, practical, and meaningful verification requirements that might be proposed for use in both documents.
J. Amer. Soc. Test. Mater. (ASTM)


Charpy V-notch, impact certification program, impact testing, notched-bar testing, pendulum impact machines, reference specimens


Splett, J. and McCowan, C. (2006), Analysis of Charpy impact verification data: 1993-2003, J. Amer. Soc. Test. Mater. (ASTM), [online], (Accessed April 19, 2024)
Created March 1, 2006, Updated January 27, 2020