Various works have been published with reference to hardness tested on cylindrical surfaces, but the experiments concerning the Brinell and Vickers hardness are very scarce. Authors developed the method for compensating the Brinell and Vickers hardness on cylindrical specimens basing on Ingerson's assumption, and referred these results to experimental ones.
It was found that the values calculated on his assumption coincided with the experimen-tal results of the tests on the Brinell specimens, but not so well on the Vickers specimens. Therefore the next compensating factor K was found experimentally.
Put K=1/ (1+k. d'/D),
where d'= diagonal of impression in mm
D=diameter of cylinder in mm
Then the value of Kis about from 0.7 to 1.0 and will change corresponding to materials or hardness numbers.