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Uncertainty evaluation of metal material Vickers hardness measurement

Lai Xu

Abstract

The uncertainty of Vickers hardness is from testing force,repeatability of indentation diagonal line,standard block inhomogeneity and hardness tester.The mathematical model of Vickers hardness and testing force,indentation depth is established.Vickers hardness is proportional to testing force,in inverse proportion to square of indentation depth.According to GB/T 4340.1—1999,to analyze from following influence factors such as testing force,indentation and standard block,when coverage factor Kp is 2,confidence interval is 95%,the uncertainty of Vickers hardness measurement is 2.5%.

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Available abstract

Key concepts: Vickers hardness test, Indentation, Indentation hardness, Materials science, Knoop hardness test, Composite material, Diagonal, Measurement uncertainty