低炭素鋼平滑材の疲労強度に及ぼす微小予ひずみの影響

概要

論文の詳細を見る
Fatigue behavior of plain specimens of low carbon steel subjected to small tensile prestrains is investigated through rotating bending tests, and compared with that of annealed or strain-aged specimens. It is found that 3 % prestraining causes the acceleration of slip initiation and crack initiation, and increases the growth rate of a small surface crack of less than 0.3 mm. It decreases the fatigue limit and the fatigue life but gives no effect on the propagation of a large crack under small scale yielding. On the other hand, aging increases the fatigue strength of the prestrained specimens and the stress for the slip initiation. These effects of the small prestrain are explained on the unpinning of dislocation locking due to tensile strain before the fatigue test.
一般社団法人日本機械学会の論文
1988-08-25