X線による金属材料疲れ破損に関する研究 : 鋳鉄および鋳鋼材料に繰返し応力が作用する場合のX線回折線半価幅の変化について

DOI Web Site Web Site

書誌事項

タイトル別名
  • X-Ray Study on Fatigue of Metals : On a Change of Half-Value Breadth due to Stress Cycles of Cast Iron and Cast Steel
  • Xセン ニ ヨル キンゾク ザイリョウ ツカレ ハソン ニ カンスル ケンキュウ

この論文をさがす

抄録

As a continuation of previous investigation concerned with fatigue of steel, the fatigue process in cast iron and cast steel is studied by observing the half-value breadth of intensity distribution curves taken from X-ray diffraction lines. X-ray photographs were taken at several stages of fatigued specimens subjected to rotary bending. It is found that the fatigue process of cast iron and cast steel is similar to that of steel from the stand point of the change of half-value breadth. Results conducted are as follows : (1) As pointed out in the previous papers, on a view of the half-value breadth variation during stress repetition, it is considered that the fatigue process consists of the three sequent stages, that is, (a) A stage in which the half-value breadth changes markedly with stress cycles (the first stage of fatigue)-in the process, the work hardening is considered to occur.(b) A stage in which the half-value breadth changes steadily with stress cycles (the secondary stage of fatigue)-the fatigue fine cracks are intiated and grow by the micro-stress concentration around micro-cracks due to stress cycles.(c) A stage in which the half-value breadth steeply varies until fracture occurs (the tertiary stage of fatigue)-in the process it is considered that the visible cracks, which lead to fracture, are initiated.(2) At the end of the secondary stage of fatigue the half-value breadth has a constant value irrespective of the magnitude of alternate stresses.(3) The relation between b/B and log n/N, where b and B are the current and the initial value of half-value breadth and n and N are the current and ultimate number of stress cycles respectively, is represented by a straight line irrespective of magnitude of alternate stress applied. This relation offers the possibilty of the non-destructive prediction of fatigue life.

収録刊行物

詳細情報 詳細情報について

問題の指摘

ページトップへ