Effects of Metallic Parameters for Distribution of Fatigue Crack Growth Rate - Dependence of Grain Size -;

피로크랙진전속도의 분포에 대한 금속학적 인자의 영향 - 결정입자 의존성 -

The strength of material is scattered owing to the inhomogenity of microstructure, in spite of the same material. Therefore, in order to design the mechanical structure with the reliability engineering, it is important to grasp the statistical nature of material strength. In this paper, effects of grain sezes for the statistical nature of the fatigue crack growth was discussed. And the statistical nature of mechanical properties was compared with the statistical nature of the fatigue crack growth rate.