Abstract
Metallic materials for machine structural use are usually composed of a number of fine crystal grains, and the crystallographic orientation of individual grain indicates the characteristic distribution pattern depending on the fabrication process. For the metal annealed sufficiently, the orientation is supposed to distribute at random in the material space. When the cyclic loading is applied to such a polycrystalline metal, slip bands are observed in the respective grains on the specimen surface. The orientation of each slip band is determined by the combination of the loading direction and the slip system of the crystal.
In this study, the slip bands formed on aluminum sheet specimens under the cyclic loading were carefully observed for a number of surface grains by an optical microscope, and the probabilistical analysis was developed on the distribution characteristics of the slip band orientation. The analytical distribution thus obtained was in good agreement with the experimental results on the orientation distribution of the slip bands.
