Leeb rebound method
The Leeb rebound method or rebound hardness test according to Leeb is a dynamic hardness test method that was developed by the scientist Dietmar Leeb.
Here an impact body, at the front end of which there is a hard metal test tip, is driven with a defined energy against the surface of the test piece. The impact of the impact body causes a deformation of the surface, which leads to a loss of kinetic energy. This energy loss is determined by measuring the speed and a hardness value HL is calculated from it.
The defined energy of the impact can be generated by spring force or a downpipe device. The speed of the impact body is measured, for example, by means of a voltage signal induced on a stationary coil. Converted values of the test result can be converted into values of other hardness scales such as Rockwell (HRC, HRB), Brinell (HB), Vickers (HV) and Shore hardness (HS).
Norms and standards
The Leeb hardness method, the calibration of Leeb hardness testers and the calibration of Leeb hardness comparison plates have been developed as DIN EN ISO 16859-1, -2 and -3 by the DIN standardization committee for hardness testing of metals . The measuring principle used is standardized internationally as ASTM A956.
Individual evidence
- ↑ Physikalisch-Technische-Bundesanstalt: Standard measuring device for the calibration of the Leeb hardness
- ↑ A956 Standard Test Method for Leeb Hardness Testing of Steel Products ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
swell
- Presentation of the process ( German Society for Material Science ; PDF file; 2.01 MB)