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Simply stated, hardness is the resistance of a material to permanent indentation. It is important to recognize that hardness is an empirical test and therefore hardness is not a material property.This is because there are several different hardness tests that will each determine a different hardness value for the same piece of material.

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Toughness is the ability of a material to absorb energy when impacted. It is tested with impact Charpy or Izod testing machines by measuring how much a predetermined weight will rise after impacting and breaking the piece under test.

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Impact strength. The impact strength is the ability of a material to absorb shock and impact energy without breaking. The impact strength is calculated as the ratio of impact absorption to test specimen cross-section. Impact strength is the resistance of a material to fracture under dynamic load.

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The impact strength is the ability of a material to absorb shock and impact energy without breaking. The impact strength is calculated as the ratio of impact absorption to test specimen cross-section. ... Macro-hardness measurement: Measurement of the Macro-hardness of materials is a quick and simple method of obtaining mechanical property data ...

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Hardness. Hardness is the resistance of a material to localized deformation. The term can apply to deformation from indentation, scratching, cutting or bending. In metals, ceramics and most polymers, the deformation considered is plastic deformation of the surface.

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Hardness - Wikipedia

Scratch hardness is the measure of how resistant a sample is to fracture or permanent plastic deformation due to friction from a sharp object. The principle is that an object made of a harder material will scratch an object made of a softer material.

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