It comes with no surprise that hardness is a characteristic of a material which is not a fundamental physical property. This is something which is defined as the resistance to indentation and it is determined by measuring the permanent depth of the indentation. It can be simply put at the point when using a fixed force load at the given indenter. The smaller the indentation the harder the material could be for sure.
That is why, there’s the need of Hardness Testers by which the hardness of the material can easily be tested. The indentation hardness value is what is accumulated by measuring either the depth or the area of the indentation by utilizing one of over 12 different test methods. Else, there is the famous Rockwell hardness test method that is defined in ASTM E-18 and is the most commonly used hardness test method today. One has to accumulate a copy of this standard and understand the standards completely prior to attempt the Rockwell test.
This method is known for measuring the permanent depth of the indentation that is produced by the load on an indenter. In the first place, a preliminary test force is applied towards a sample by using a diamond or a ball indenter. This preload breaks through the surface for the purpose of reducing the effects of surface finish. After holding the preliminary test force for a specified dwell time and the baseline depth of the indentation is measured after that. A Hardness Tester is always a good option for this task.
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