brinell number
Học thuậtThân thiện
Definition
Noun: A numerical value that represents the hardness of a material, derived from the Brinell hardness test. This test measures the resistance of a material to permanent indentation by pressing a hard, spherical indenter into its surface under a specified load. The Brinell number (HB) is calculated as the applied force divided by the surface area of the resulting indentation.
Usage
The Brinell number is used to specify and compare the hardness of metals and alloys, particularly those with coarse or uneven grain structures. It is a standard engineering and metallurgical parameter. - The specification requires the steel to have a minimum Brinell number of 200. - Softer materials like aluminum will yield a lower Brinell number than hardened steel.
Advanced Usage
- Reporting a Brinell number: The value is often reported with the test conditions, such as "350 HBW 10/3000", where HBW indicates a tungsten carbide ball indenter, '10' is the ball diameter in millimeters, and '3000' is the applied force in kilograms-force.
- Comparative analysis: While the Brinell number is useful for bulk hardness, other scales (like Rockwell or Vickers) may be preferred for thinner materials or harder surfaces.
Variants and Related Words
- Brinell hardness test (noun phrase): The standard test method from which the Brinell number is derived.
- Brinell hardness (noun phrase): Often used synonymously with Brinell number.
Synonyms
- Brinell hardness value
- HB number (common abbreviation)
Related Terms and Concepts
- Indentation hardness: The general category of hardness measurement the Brinell number belongs to.
- Rockwell hardness number: A different, more common hardness scale derived from a different test method.
- Vickers hardness number: Another hardness scale, suitable for a wider range of materials.
Noun
- measure of the hardness of a material