The same value of f/D 2 will, in principle, give the same hardness value for different loads and the load used in practice depends on the nature and the hardness of the material under test. Five standard values of f/D 2, i.e. 30, 10, 5, 2.5 and 1, have been adopted.Recommended combinations of load and diameter for different materials are given in BS EN 10003-1:1996.
Read On