ころがり接触による残留応力の変化

概要

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The changes in residual stress occurring in hardened steels as a result of rolling contact operation between the cylinder and the ball are described. The relationship of contact load, the number of the loading cycles and the hardness of the specimen (H_RC 63-54) to the extent of residual stress alteration have been examined. The threshold stress exists, below which no marked residual stress change occurs. For H_RC 62, 58 specimen, the threshold stress is about P_max=350 kg/mm^2, and for H_RC 54 specimen, it is about P_max=250 kg/mm^2. With the rise of contact stress, the peak value of compressive residual stress due to the rolling contact becomes larger, and the location of the peak become deeper. The peak depth corresponds to the depth of maximum shear stress. When P_max=600 kg/mm^2, the residual compressive stress in the H_RC 58, 54 specimen reaches to the saturation whithin the loading cycle of 10 or so, and the lower the hardness of the specimen is, the lower the saturation value is. In case of the rolling contact between the cylinder and the ball of the same hardness (H_RC 58, 54) the residual stress changes due to the operation are similar in both specimens. The reason for this producing unsimilar distribution is not clear, but it is through to be due to the difference in hardness or in residual stress distribution of specimens before the operation.
社団法人日本材料学会の論文
1969-07-15