The authors have conducted fatigue tests on the induction-hardened V-notched specimens, 50 mm in diameter. The experimental results are summalized in the following. In the normalized V-notched specimen (α is nearly 7.65), the value of σ
w2 is 6.5kg/mm
2 and σ
w1 is 1.5 kg/mm
2 (this is tredicted on Mr. Ouchida's data), but in the induction-hardened V-notched specimen, these values are very large, that is, σ
w2 is the fatigue limit causing the failure of a whole piece, and σ
w1 is the lowest of the stresses causing the start of crack at the bottom of V-notch after infinite number of repetitions. Lastly, the authors discussed the reason why σ
w2 and σ
w1 of the induction-hardened specimens are very large in comparison with those of the normalized ones.
抄録全体を表示