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Hardness is defined as the "Resistance to Deformation". When doing a hardness test, the hardness tester applies a fixed load and the depth of penetration is measured by different means and converted to different units. More simply put, when using a fixed force (load) and a given indenter, the smaller the indentation, the harder the material. Indentation hardness value is obtained by measuring the depth or the area of the indentation using one of over 12 different test methods.
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