TheBrinellhardnessnumberisafunctionofthetestforcedividedbythecurvedsurfaceareaoftheindent.Theindentationisconsideredtobesphericalwitharadiusequaltohalfthediameteroftheball.Theaverageofthetwodiagonalsisusedinthe
The Brinell Hardness Test is the oldest method of hardness testing commonly used today. The Brinell test was invented in Sweden by Dr. Johan August Brinell in 1900. This test is often used to determine the hardness of castings and forgings whose grain structure is too course for accurate Rockw...
Dozens of different hardness tests find use today, including Brinell, Rockwell and Vickers. Each has variants based on the load used to create the indentation. Brinell tests use the largest loads, suiting it for testing thicker test pieces with relatively rough surfaces,...
is calculated from the load and the cross-sectional-area, or the depth, of the indentation. A schematic illustration is presented inFigure 11.15.73For example, theBrinell testemploys a 10mm diameter sphere of steel ortungstencarbide, and theBrinell HardnessNumber (BHN) is given by the formula:...
For example, an approximate equation connecting the two variables for steel is σUTS (psi) = 500 HB, where HB is the Brinell hardness. In addition, theory has shown that the hardness value (H) is related to the yield stress of metals through the formula H = 3σ0 and this relationship...
So, can the Rockwell Hardness value of the workpiece be directly calculated from the indentation diameter of the Brinell hardness tester? The answer is of course yes. According to the Brinell Hardness and Rockwell Hardness conversion table, an empirical formula that is easy to calculate and easy ...
The Pin Brinell’s load to indentation size ratio provides a displacement that is equivalent to the most common Brinell test (3000 kg load, 10mm ball). The Brinell values are arrived at using the standard Brinell formula. Available in two models: the CPIT Impact Tester and CPST Static & ...
exchange. The calculation formula can be probably recorded as: 1HRC = 1/10HB. According to the German standard DIN50150, the following is a comparison between the tensile strength of common steel and Vivtorinox hardness, Brinell hardness and Rockwell hardness. ...
method) and on the total depth of the indentation (measurement with a sensor in the hardness meter, indentation under the load of the measuring force). The Brinell hardness, calculated from the diameter of the plastic indentation, was marked as HBdand calculated according to a Formula (1): ...
During the test, a small steel or carbide ball is forced into the material of unknown hardness with a set amount of pressure. The area of the resulting indentation is measured, and a mathematical formula is applied to yield a Brinell hardness number. Brinell hardness is commonly used in ...