Abstract：Brinell hardness test was conducted according to GB/T 231.1-2018 Metallic materialsBrinell hardness testPart 1: Test method. The main sources and sort of uncertainty, which influenced the measurement results, were analyzed. The uncertainty of measurement results was analyzed according to JJF 1059.1-2012 Evaluation and Expression of Uncertainty in Measurement. Meanwhile, the testing dispersion of expanded uncertainty was considered. The results showed that the uncertainty of Brinell hardness test in the laboratory was 2HBW10/3 000. The expanded uncertainty was (196±4)HBW10/3 000 when the coverage factor was 2. At the same time, the visual fatigue caused by longtime inspection of operator and the work hardening caused by overheating of surface of test specimen should be avoided in the process of testing.
2022, Vol. 40 
