DETERMINATION AND UNCERTAINTY PROPAGATION OF SENSITIVITY COEFFICIENTS IN ROCKWELL HARDNESS MEASUREMENTS

Pierluigi Rizza, Renato Machado, Alessandro Germak
Abstract:
In the field of hardness measurements, a problem arises when trying to understand how different measurement parameters (speed of the indenter, force, thermal drift, etc.) affect the outcome of the measurement itself. Because the mathematical model defining hardness scales do not consider such factors, the simplest way to include additional influence parameters in the mathematical model is to introduce them linearly via sensitivity coefficients, which are obtained experimentally and thus characterized by uncertainties. Uncertainties of the sensitivity coefficients are in general not considered in the evaluation of the combined standard uncertainty of the hardness measurements. In this paper a general procedure is presented and applied to HRA and HRC measurements.
Keywords:
uncertainty propagation; sensitivity coefficient; hardness; law of propagation of uncertainty
Download:
IMEKO-TC5-2022-093.pdf
DOI:
10.21014/tc5-2022.093
Event details
IMEKO TC:
TC5
Event name:
TC5 Conference 2022
Title:

14th TC5 Conference on the Measurement of Hardness (together with the 24th TC3 Conference on the Measurement of Force, Mass and Torque, the 6th TC16 Conference on Pressure and Vacuum Measurement, and the 5th TC22 Conference on Vibration Measurement)

Place:
Cavtat-Dubrovnik, CROATIA
Time:
11 October 2022 - 13 October 2022