Determining mechanical breakage characteristic values

摘要

The method includes the application of two pyramidal indentation impressions (1,2) simultaneously at a selected distance in the material to be tested. So that from the diametrical corner points of the impressions facing each other, cracks emerge which connect at the surface, and this crack connection is detected. The connection crack (3) resulting between the impressions, cuts through a conductor path connected with the surface. A current circuit is interrupted, and this interruption is indicated in an indicator. A transmitter and a receiver can be introduced in the system.