抄録
A lot of studies on fatigue by using X-ray diffraction methods have been conducted during these ten years. The X-ray diffraction makes it possible to measure not only macro-stress but also various parameters on microstructure such as micro-stress in materials. Therefore the use of X-rays is promising as source for creation of new and significant fields in the fatigue study, and its application by the persons concerned about this kind of problems is foreseen. The 2nd Division of the Committee for the X-ray Study on Deformation and Fracture of Solid Material in the Society of Material Science, Japan, have conducted a series of studies by collaboration of scientists with a view to achieving further development in this field of studies.
The first report of the Division was presented in the Journal of Material Science, Japan, vol. 18, p. 679 and 685 (1969), as a survey of the investigation conducted. One of the suggestions given in the report was that the broadening of X-ray diffraction line would represent the state of fatigued metals well and possibly indicate the extent of fatigue damage. This suggestion has stimulated engineering interest. Therefore as many experimental results on the change in broadening of the diffraction line during fatigue have been gathered as possible, and examination has been made of its application to the nondestructive method indicating fatigue damage, for the second report of the Division.
