UNCERTAINTY EVALUATION OF CHARPY IMPACT TESTING MACHINES

Saher R. Gawda, A. Abu-Sinna, M. I. Mohamed, Moanes M. Mohamed, Ali E. Abuelezz

Abstract

To determine the confidence of the test results, it is necessary to evaluate the main factors contributing to the uncertainty in Charpy impact measurements (pendulum impact). These factors are: the uncertainty of reference force and length measuring devices and its long term instability (drift), machine resolution, rated energy error, indicated energy error, losses due to the drag of the pointer, friction losses in the bearing and air resistance, and other geometric parameters. In this study the calibration process based on the relevant international standard is explained. Most of the uncertainty elements are identified and directly verified. Other elements that could not be directly verified are analyzed or assessed using the available information.

Keywords

calibration, impact testers, uncertainty, direct method

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IMEKO-TC3-2010-012.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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