Abstract
In studying plastic deformation by measurement of hardness [1] it is necessary to use a hardness-stress calibrating graph plotted from the results of tests under the simplest stress conditions. For the use of these graphs in plastic deformation in general to be well-founded, it is essential to have experimental data confirming that the hardnessstress curve is common to various states of stress. However, [1–3] give this data from tensile, compressional and torsional tests only. Clarification of this problem is particularly important, because all the stress and deformation components for a number of cases of practical importance can be determined by reference to the stress intensities at various points in a body [4].
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