The Knoop hardness

The Knoop hardness (Knoop こうど, Knoop hardness) is one of the standards to express the hardness of industrial materials and is a kind of the burglary hardness.

Because numerical increase and increase of the hardness support in comparison with Mohs scale more continually, I am used for a quantitative index of the hardness.

I divide examination load by indentation surface area and am calculated.

${\displaystyle HK={P \over {C_{p}L^{2}}}}$

An item:

L2 = indentation surface area (unit mm²)

Cp = correction factor 0.070279

P = weighting (unit kgf)

Example

Materials	The hardness
Money	69
Quartz	820
Silicon carbide	2480
High pressure aspect boron nitride	4700
Diamond	8000

Allied item

• Young's modulus (vertical elastic coefficient)
• Rigidity

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This article is taken from the Japanese Wikipedia The Knoop hardness

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