Brinellmittaukset

Brinell hardness testing is a method used to determine the hardness of a material. Developed by Johan August Brinell in 1900, it is one of the oldest and most common hardness testing techniques. The test involves pressing a hardened ball of a specific diameter into the surface of the material being tested. The ball is typically made of tungsten carbide or steel and is pressed into the material with a standard load for a set amount of time.

After the load is removed, the diameter of the indentation left by the ball is measured. The Brinell hardness number (HB) is then calculated using a formula that takes into account the diameter of the ball, the applied load, and the diameter of the indentation. A larger indentation indicates a softer material, resulting in a lower Brinell hardness number. Conversely, a smaller indentation signifies a harder material, yielding a higher Brinell hardness number.

Brinell hardness testing is particularly useful for materials with a coarse grain structure or those that exhibit significant plastic deformation under the indenter. It is often used for testing metals, alloys, and some plastics. The test is relatively simple to perform and provides a good indication of a material's resistance to scratching and wear. However, it can leave a relatively large indentation, which may be undesirable for some applications where surface integrity is critical. Standards such as ASTM E10 and ISO 6506 define the procedures and specifications for conducting Brinell hardness tests.