Mechanical surface treatments such as shot peening and cavitation peening are useful techniques to enhance fatigue strength of metallic materials. In order to establish mechanical surface treatments of mechanical components, the effects of geometry on enhancement of fatigue strength should be investigated. In the present paper, a plate with a hole as a typical shape, which had a corner and inner wall, was treated. The tested material was Duralumin Japanese Industrial Standards JIS A2017-T3. The plate was treated by shot peening and cavitation peening. Although the fatigue life of shot peened specimen was shorter than that of non-peened specimen, cavitation peening could improve fatigue life when the cavitation bubbles were shed and collapsed on the inner wall surface.
