抄録
In order that we do the cause survey of failure accident precisely, we need to accumulate the knowledge regarding the detailed fracture information in the failure accident that occurred in the past time. Last year. two accidents occurred in a railroad. One was the damage of two truck bolts. The other was the damage of a brake shoe. As a result of the fractography, the cause of the truck bolt's damage was fretting fatigue destruction. Also, it understood the cause of the brake shoe's damage that is a heat crack the fatigue destruction as an origin. In this paper, we described the fracture structure that was observed with those fracture analyses.
