On the Errors of Rockwell Hardness Number : 2nd Report, The Effect of the Form of Diamond Indentor

Abstract

Regarding the error introduced into Rockwell hardness numbers by the error of form of diamond indentor, this paper reports the results of experiment and the calculated results from Meyer's law. Results obtained by observation and theoretical calculation respectively coincided well with each other. The errors resulted from the errors in the total load W₂ kg, the preliminary load W₁ kg (see the first report), the tip radius R mm and the angle of cone θ (rad) of diamond indentor will be as follows : [numerical formula]