Knoop hardness in Mechanical Behaviour and Testing Formulas

Knoop hardness test comprises of 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). And is denoted by HK. Knoop hardness is usually measured using the Kilogram-Force per Square Millimeter for Pressure. Note that the value of Knoop hardness is always positive.

Formulas to find Knoop hardness in Mechanical Behaviour and Testing

fxKnoop hardnessGo

List of variables in Mechanical Behaviour and Testing formulas

fx Indentation Load Go

fx Diagonal length Go

FAQ

What is the Knoop hardness?

Knoop hardness test comprises of 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 is usually measured using the Kilogram-Force per Square Millimeter for Pressure. Note that the value of Knoop hardness is always positive.

Can the Knoop hardness be negative?

No, the Knoop hardness, measured in Pressure cannot be negative.

What unit is used to measure Knoop hardness?

Knoop hardness is usually measured using the Kilogram-Force per Square Millimeter[kgf/mm²] for Pressure. Pascal[kgf/mm²], Kilopascal[kgf/mm²], Bar[kgf/mm²] are the few other units in which Knoop hardness can be measured.

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