𝑯𝒂𝒓𝒅𝒏𝒆𝒔𝒔 𝑻𝒆𝒔𝒕

 




𝑯𝒂𝒓𝒅𝒏𝒆𝒔𝒔 𝑻𝒆𝒔𝒕:

The hardness test is a mechanical test for material properties which are used in engineering design, analysis of structures, and materials development. The principal purpose of the hardness test is to determine the suitability of a material for a given application, or the particular treatment to which the material has been subjected. The ease with which the hardness test can be made has made it the most common method of inspection for metals and alloys.

Hardness is defined as the resistance of a material to permanent deformation such as indentation, wear, abrassion, scratch. Principally, the importance of hardness testing has to do with the relationship between hardness and other properties of material. For example, both the hardness test and the tensile test measure the resistance of a metal to plastic flow, and results of these tests may closely parallel each other. The hardness test is preferred because it is simple, easy, and relatively nondestructive.

There are many hardness tests currently in use. The neccessity for all these different hardness tests is due to the need for categorizing the great range of hardness from soft rubber to hard ceramics.

Current practice divides hardness testing into two categories:





𝟏) 𝐌𝐚𝐜𝐫𝐨 𝐇𝐚𝐫𝐝𝐧𝐞𝐬𝐬 𝐓𝐞𝐬𝐭𝐞𝐫𝐬 𝐋𝐨𝐚𝐝𝐬

 Rockwell

 Brinell

 Vickers





𝟐) 𝐌𝐢𝐜𝐫𝐨 𝐇𝐚𝐫𝐝𝐧𝐞𝐬𝐬 𝐓𝐞𝐬𝐭𝐞𝐫𝐬

 Knoop diamond

 Vickers diamond pyramid

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