Equation icon  Knoop hardness

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Resource type: Equation
Description: The Knoop microhardness test is a measure of a material's resistance to permanent deformation at the surface using a pyramid diamond indenter. Although not strictly speaking a property, hardness is often used in materials selection process. The equation relates specifically to the Knoop testing process and equipment, used primarily for brittle and thin materials at a small scale.

TeX format: HK = {P \over {C_pL^2}}

HK {HK} = Knoop hardness (Pa) {Pa}
P {P} = Indenter load (N) {N}
Cp {C_p} = Indenter shape correction factor
L {L} = Largest indent length/diameter (m) {m}

Keywords: hardness • Knoop • diamond indent • testing • surface • microhardness • cermic hardness • brittle
Categories: Science approaches
Properties > Mechanical & thermal > Yield strength
Properties > Mechanical & thermal > Hardness
Properties > Mechanical & thermal > Impact toughness
Testing, analysis & experimentation > Mechanical testing
Scale > Micro
Created by: The University of Liverpool
License: This resource is released under the Creative Commons Attribution license (2.0 UK: England & Wales).
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Date created: 07 July 2010
Date added: 04 August 2010
Resource ID: 3178