軟鋼の回転曲げ疲労過程における動ひずみ振幅の観察

概要

論文の詳細を見る
Annealed mild steel specimens have been subjected to rotation under bending stress of 21〜31 kg/mm^2 with the speed of stress repetition at 3〜3000 rpm at room temperature to examine its dynamic strain amplitudes and creep strains. A wire strain gage and an ocillogram have been employed by means of a slip ring to record the process. (1) Fatigue process, which is expressed by the dynamic strain amplitude, can be divivded into three stages : first stage of softening, second stage of hardening, and third stage of apparent softening. (2) When the speed of stress repetition is slow and the stress amplitude on the specimens is larger than that of the speed of stress repetition. From the experimental results, it has been made clear that fatigue life is in inverse proportion to the peak of dynamic strain amplitude, i. e. the maximum value of softening process. (3) With the exception of the third stage, the dynamic strain amplitude on fatigue process is proportional to the transient creep strain during fatigue process.
社団法人日本材料学会の論文
1969-07-15