How to Calculate Knoop hardness?
Knoop hardness calculator uses Knoop hardness=14.2*Indentation Load/(Diagonal length^2) to calculate the Knoop hardness, Knoop hardness test involves pressing the pyramid-shaped rhombic indenter (longitudinal edge angle 172.5°, transverse edge angle 130°) into a specimen with a defined test load (between 1 gf and 2 kgf). Knoop hardness and is denoted by HK symbol.
How to calculate Knoop hardness using this online calculator? To use this online calculator for Knoop hardness, enter Indentation Load (P) and Diagonal length (d) and hit the calculate button. Here is how the Knoop hardness calculation can be explained with given input values -> 1.42 = 14.2*0.980664999999931/(0.001^2).