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Knoop Hardness

The Knoop hardness is the measure of the Knoop hardness test, a micro-hardness test for mechanical hardness used particularly for very brittle materials or thin sheets, where only a small indentation may be made for testing purposes.

The Knoop hardness equals the applied force divided by the length of the long-axis indentation squared and the correction factor.

Formula

QuantityVariable["HK", "Pressure"] == QuantityVariable["P", "Force"]/(QuantityVariable["L", "Length"]^2*QuantityVariable[Subscript["C", "p"], "Unitless"])

symbol description physical quantity
HK Knoop hardness "Pressure"
L length of long-axis indentation "Length"
P applied force "Force"
Cp correction factor "Unitless"

Forms

Examples

Get the resource:

In[1]:=
ResourceObject["Knoop Hardness"]
Out[1]=

Get the formula:

In[2]:=
FormulaData[ResourceObject["Knoop Hardness"]]
Out[2]=

Use some values:

In[3]:=
FormulaData[ResourceObject["Knoop Hardness"], {QuantityVariable[ \!\(\*SubscriptBox[\("C"\), \("p"\)]\),"Unitless"] -> 0.070279`, QuantityVariable["L","Length"] -> Quantity[3.37`, "Millimeters"]}]
Out[3]=

Source Metadata

  • Creator:
  • Date: 1939

Publisher Information