Open Access
Table 5
Results analysis of Vickers hardness measurements.
| Quantity | Value | Standard uncertainty | Distribution | Sensitivity coefficient | Uncertainty contribution |
|---|---|---|---|---|---|
| Force (F), kgf | 30.001 | 0.249 | Normal | 13 | 3.3 |
| Indentation diameter (d), mm | 0.372060 | 0.305 × 10−3 | Normal | −2200 | −0.66 |
| The expanded uncertainty | ±6.7 HV | Coverage factor 2 at confidence level 95% | |||
| Mean value | 401.9 HV | ||||
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