UNCERTAINTY EVALUATION OF CHARPY IMPACT TESTING MACHINES |
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| 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
- Download:
- IMEKO-TC3-2010-012.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC3
- Event name:
- TC3 Conference 2010
- Title:
21st Conference on Measurement of Force, Mass and Torque (together with TC5 HARDMEKO 2010 and 2nd TC22 Meeting on Vibration Measurement)
- Place:
- Pattaya, THAILAND
- Time:
- 21 November 2010 - 25 November 2010