3609 A Method Arresting Crack Initiation from Stop Drilling Hole

Abstract

Drilling a hole at crack tip is one of the methods for arresting crack growth. This hole is called stopping hole. Some application studies for arresting crack growth were performed and the improvement of fatigue life of cracked material was shown. In the present study, also, the arresting method of crack growth was investigated with drilling plural holes at crack tips and in the vicinity of the crack tips. In some cases of drilling positions of holes, fatigue life became longer than the case that stopping holes only were drilled. This is related to the decreasing stress concentration at the stopping hole edges.