Fatigue cracks in pure aluminum rolled sheets do not propagate to the mode I direction, but to the rolling direction as mixed mode I+II condition when rolling direction is about 30 degrees from the tensile fatigue load. In order to clarify the cause of this phenomenon, fatigue crack growth path, crystal grain sizes and crystal orientation were investigated of pure aluminum rolled sheets. As the results, the crystal grain size doesn't affect the fatigue crack growth path. The fatigue crack growth path doesn't orient to the rolling direction after annealing. On the other hand, the effect of annealing time and temperature control the crack growth path. In addition, the textures of slip plane (111) affects fatigue crack growth paths.
