Cool Vickers Hardness Testing Ideas. See our hardness testing conversion table. The indenter produces a square indentation, the diagonals of which are measured.
It uses an elongated pyramid to make the impression, with the measurement of the long diagonal used to calculate the knoop hardness. The test force varies from 49.03n (5kgf) to 980.7n (100kgf). The yield stress can be approximated from the hardness (given in hv) as follows:
