抄録
An effect of local plastic deformation on the fatigue life in the holed specimen was investigated. The local plastic deformation was applied around the hole by inserting pin into the hole, and the pin was removed before the testing. Used material was Aluminum alloy 2024-T3. After removing pin, there was circular hole or elliptical hole in the center of flat plane of the specimen. Due to applying local deformation, the fatigue lives of holed specimens became longer. Especially, the specimen where the holes shape was made elliptical was clearly improved in the fatigue life. Hardness distribution showed that the residual stress was distributed around the hole.
