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.

Determination and uncertainty propagation of sensitivity coefficients in rockwell hardness measurements / Rizza, Pierluigi; Machado, Renato; Germak, Alessandro. - (2023), pp. 1-6. (Intervento presentato al convegno Joint IMEKO TC3, T5, TC16 and TC22 International Conference tenutosi a Cavtat-Dubrovnik, CROATIA nel 11-13 October 2022) [10.21014/tc5-2022.093].

Determination and uncertainty propagation of sensitivity coefficients in rockwell hardness measurements

Rizza, Pierluigi
;
Germak, Alessandro
2023

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.
2023
Joint IMEKO TC3, T5, TC16 and TC22 International Conference
11-13 October 2022
Cavtat-Dubrovnik, CROATIA
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/76600
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