Abstract
This paper presents the experimental data and the analytical explanation of the yielding of a mild steel cylinder with a radial hole under compression. In the experiment, the relationship between, not only the yield stress and the various ratios of the hole diameter to the external diameter of cylinders with variable sizes, but also the yield stress and the various ratios of the internal to the external diameter of the cylinder, were examined under compression. In order to analyze the experimental data, the maximum point of stress occurring in the cylinder was determined in the experiment, and then the yield stress of the cylinder was analyzed in relation to two kinds of problems. One, in the case of thick-walled cylinders, is a strip perpendicular to the radial hole of the cylinder with a hole at the maximum point of stress. The other, in the case of the intermediate-walled cylinders, is an infinite plate with a hole. From the analytical results, it was found that the yield stress of the cylinder could be accounted for by considering the effect of the surface layer near the hole.
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