The tabulated Janka Hardness numbers are an average.
2.
Vickers and Rockwell hardness numbers exhibit qualitatively different behaviour when used to describe some materials and phenomena.
3.
This numbering system is not standardized reeds with the same hardness number often vary in hardness across manufacturers and models.
4.
In all these, a process is defined for loading the indenter, measuring the resulting indentation and calculating a hardness number.
5.
In microindentation testing, the hardness number is based on measurements made of the indent formed in the surface of the test specimen.
6.
The hardness number is based on the applied force divided by the surface area of the indent itself, giving hardness units in kgf / mm?
7.
The hardness number is determined by the load over the surface area of the indentation and not the area normal to the force, and is therefore not pressure.
8.
To calculate Vickers hardness number using SI units one needs to convert the force applied from newtons to kilogram-force by dividing by 9.806 65 ( standard gravity ).
9.
Furthermore, experimental results obtained using these measurement methods has shown that the hardness number can be used to predict the stress required to permanently deform steel, a characteristic that fits in well with our idea of resistance to permanent deformation.
10.
In 2004 RADO created a'high-tech diamond', by the transformation of carbon into a nanocrystalline diamond with a Vickers hardness number of 10, 000, thus naming the watch the V10K . It is the hardest watch on Earth, certified by the Guinness Book of World Records.
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