球状黒鉛鋳鉄FCD 45 の微小き裂の発生と進展の両挙動 : 回転曲げと繰返しねじりの比較

概要

論文の詳細を見る
Using the conditions of rotating bending and reversed torsion, these fatigue limits of smooth specimens were verified to be critical stress required to propagate the microcracks nucleated in the neighborhood of the graphites. The ratio of the critical stress in torsion to that in bending was about 80%. This value was nearly equal to that in a carbon steel with a micro-hole under the same loading conditions. At the stress level above the fatigue limit in bending, the ratios the number of cycles to microcrack nucleation and to microcrack coalescence to the total life were 3 to 7% and 78 to 89%, respectively. These ratios in torsion were 0.4 to 12% and 77 to 97%, respectively. While the ratios in bending were independent to the stress level, those in torsion were larger at the lower stress level.
一般社団法人日本機械学会の論文
1985-04-25