超音波法によるレール軸力の評価に関する研究

（レール軸力とウェーブレット係数の関係について）

抄録

The part of rail joint becomes the causes of the disadvantage points such as the ride discomfort, the undesired sound and the track maintenance, etc.. For restraining those points, the long rail made by welding the standard length rails has been developed. However, the problems of the overhang or the breakage caused by bucking have been pointed out. Therefore, several evaluation techniques for managing those have been proposed. In the previous study, we had presented the relationship between the increases of compression stress and the behaviors of the ultrasonic echo to that stress. Concretely, it was shown that there is high correlation between the increase of the maximum wavelet coefficient of that echo and each load stress. In this study, the compression test to the actual rail were carried out. As the results, it was proven that the coefficient was effective for the stress estimation because the correlation between the stress and the coefficient was provided.