THE CORRECTION OF HARDNESS VALUE MEASURED ON A CURVED SURFACE SPECIMEN

In view of the difficulties in solving the hardness problems, the assu mptions to simplify the problems have been presented based on (1) the analogy between the elastic solution in the linear elastic indentation problem and the elastic-plastic solution derived from Meyer's law, (2 ) the concept of the equivalent spherical indenter for a conical (or p yramid) indenter, and (3) Euler's formula which relate a spherical sur face with a general curved surface, in this paper. By means of these a ssumptions, the calculating formulas of the corrective value (or coeff icient) of the hardness value measured on a curved surface specimen ha ve been given. To examine whether the formulas obtained in this paper are right or ndt, we compare them with the experimental results. It is shown that all the theoretical values seem to agree with experimental data. (C) 1998 Elsevier Science Ltd. All rights reserved.