転造Vみぞ付き試験片の回転曲げ疲れ強さについて

概要

論文の詳細を見る
The fatigue strength of round specimens with single cold-rolled V-groove was investigated for two sorts of steel, carbon steel of 0.25% carbon content and low nickel-chrome steel of 0.47% carbon content, under correlation with the rate of reduction of area due to cold-rolling. The bottom diameter of the groove was constant, namely 11mm, and so, the outer diameter was varied to get various reduction of area. According to the results, an increase of fatigue limit as much as 40 to 67% in comparison with plane round specimens, and an increase from 140 to 175% in comparison with specimens having turned V-notches were obtained in the case of the rate of reduction of area from 43 to 46%. Larger increase in the fatigue limit is expected for specimens with larger reduction of area. The causes of the remarkable increase in the fatigue limit are attributed to residual stresses, formation of fiber structure, and strain-hardening in wide range.
一般社団法人日本機械学会の論文
1953-11-25