C标尺洛氏硬度试验的不确定度评定

Uncertainty evaluation of scale C rockwell hardness test

根据C标尺洛氏硬度试验中标准硬度块、硬度计及试样等影响不确定度的因素,提出一种试验室洛氏硬度测量值不确定度的评定的方法,即通过对产生不确定度的若干分量的计算,最后计算出扩展不确定度.被测试样的扩展不确定度U=0.62HRC,硬度值的相对偏差小于1%,表明不确定度对试验的影响在可接受范围之内.

This paper proposes a method on the evaluation of uncertainty of scale C Rockwell hardness test, in which those uncertainties associated with hardness-reference blocks, hardness tester, and specimen are taken into account. In other words, the effect on the separated uncertainties is calculated to derive the expanded uncerlainty. The expanded uncertainty of test piece U=0.62HRC, and the relevant deviation of hardness within 1% show that the effect of uncertainties on the experiment is acceptable.