Hardness testing is the measure of resistance an object has when indented using mechanical force. The work of a hardness tester involves gauging how long it takes for the object to disintegrate. The method is commonly used to understand the physical strength of building objects in mechanical operations. How strong the material is places it in specific categories. Every strength category fits into a deserving mechanical use.
Methods of Hardness Testing
The system of hardness testing varies according to the type of material. There are 4 main methods that explain how a hardness tester works.
- Rockwell Testing – the machine uses a cone-shaped indenter for testing metals and a particular cadre of plastics. It is economical as it requires a small sample and time. The depth of indentation ascertains the hardness of the material. A small load is placed on the material, then a big load. Both measurement are recorded. The difference in load measurement between the 2 loads is the basis of hardness testing.
- Vickers Testing – the basis of this method is the ability to withstand plastic deformation. The pyramid-shaped indenter produces impressions that are used to calculate the material’s hardness.
- Brinell Testing – it comprises of 25 load combinations. The focus of hardness testing is the variation between the ball size and the test force. It is made possible by the alloy ball indenter.
- Knoop Testing – the diagonals on the Knoop indenter estimates the variation of the hardness of a material. The procedure best suits small materials.