Abstract
In a field of railroad operation, various kinds of checking and nondestructive testing are executed periodically in order to maintain thorough safety. In this report recent techniques are reviewed for important three parts such as axle, wheel, and rail. Then, three new techniques developed by us are introduced. The first is ultrasonic nondestructive technique using SH-waves to evaluate fretting fatigue cracks on axle of Shinkansen vehicle. Second is acoustoelasticity measurement of residual stresses in wheel rim, and the third is nondestructive measurement of axial stress in long rail.
