Hollow structure specimens which represent the similar topology of components are produced

and dry blast and wet blast are used to strengthen the surface. Then

fatigue tests are carried out. The experimental results show that the fatigue property of polished specimen is the lowest

and specimen by the dry blast process is higher and the fatigue life is as 10.4 times as that of polished specimen. The experimental results also show that the fatigue property of specimen by wet blast processed is the highest

and the fatigue life is at least as 3.3 times as that of specimen by dry blast processed. This conclusion can be useful to improve shot peening parameters.