Brinellhårdhetsprovning

Brinell hardness is a method for testing the hardness of materials. It was developed by the Swedish metallurgist Johan August Brinell in 1900. The Brinell hardness test is a simple and widely used method for determining the hardness of metals and alloys.

The test involves pressing a hardened steel or carbide ball of a specific diameter into the surface of the material to be tested. The ball is pressed into the material with a predetermined load for a specific 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.

The Brinell hardness test is suitable for a wide range of materials, including soft metals like aluminum and copper, as well as harder materials like steel. However, it is not recommended for very hard materials that would deform the ball, or for very thin materials that might be penetrated completely. The test results can be influenced by factors such as surface finish, temperature, and the presence of any surface contaminants.

The Brinell hardness test provides a measure of a material's resistance to plastic deformation by indentation. It is commonly used in manufacturing and quality control to ensure that materials meet specified hardness requirements. Different standardized ball diameters and loads are used depending on the material being tested, with common ball diameters being 10 mm, 5 mm, 2.5 mm, and 1 mm. The load is applied for typically 10 to 30 seconds.