Hardness is a measurement method, when a force acts on a particular solid material, the solid material the resistivity of the various permanent change in shape. This term may also refer or tempered hardness or scratch, abrasion or cutting. Hardness is a characteristic of the substance, when applying one load or force, it can resist permanent deformation (bending, breaking or changing shape). For some polymers and elastomers, the hardness is defined by the elastic deformation resistance of its surface. The larger the hardness of the metal, the greater the resistance to deformation. This experiment Vickers hardness test. Indenter tip is diamond, square bottom, the angle between the two pyramids 136 degrees.
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