NIST Recommended Practice Guide: Computing Uncertainty for Charpy Impact Machine Test Results

Published

September 1, 2007

Author(s)

Jolene Splett, Christopher N. McCowan, Hariharan K. Iyer, Chih-Ming Wang

Abstract

The purpose of this recommended practice guide is to demonstrate how to determine the uncertainty associated with mean absorbed energy of specimens tested on a Charpy impact machine. We assume that the Charpy machine has successfully met the requirements for both direct and indirect verification as described in the ASTM E 23, Standard Test Methods for Notched Bar Impact Testing of Metallic Materials. We follow the recommendations and procedures in the Guide to the Expression of Uncertainty in Measurement for computing uncertainty.We assume the reader is somewhat familiar with the Charpy machine verification program administered by the National Institute of Standards and Technology.

Citation

Special Publication (NIST SP) -

NIST Pub Series

Special Publication (NIST SP)

Pub Type

NIST Pubs

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Keywords

absorbed energy, Charpy V-notch, impact test, pendulum impact test, uncertainty, verification testing

Citation

Splett, J. , McCowan, C. , Iyer, H. and Wang, C. (2007), NIST Recommended Practice Guide: Computing Uncertainty for Charpy Impact Machine Test Results, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=150515 (Accessed October 16, 2025)