Brinell hardness tester
The Brinell hardness tester applies the oldest approach of hardness testing widely used in recent times. The hardness testing method was invented in Sweden by Dr Johan August Brinell in 1900.
Brinell hardness test is usually used to figure out the hardness of forging and casting whose grain structure is very course for a correct Vickers or Rockwell testing.
This testing method has about 25 different ball or load combinations of testing which gives room for nearly all metals to be tested using the hardness test method by just varying the load size and testing the force in accordance with specimen dimension and design. Oftentimes, the result of the test is considered correct as long as the test force ratio and load size remain constant.
Brinell hardness tester results are used in the industry as the basis for commercial shipment acceptance and quality control purpose. This hardness testing method results sometimes correlate with some other metallic characteristics which include wear resistance, ductility, and tensile strength.
How to Carryout Brinell Hardness Testing Method
A Brinell hardness test can be carried out in two easy steps:
The first step is the use of a known force and indicator. The known force is applied through the known indenter perpendicular to the specimen and holds the known force for a particular period of time.
In step two the diameter of the resulting indentation is to be measured in at least two different directions perpendicular to each other. After which the Brinell hardness value is calculated from the mean of the diameter measurement with the help of mathematical formula specially developed for this purpose.