Low Cycle Impact Fatigue on Pure Aluminum

Abstract

To investigate the influence of the surface layer rataining the roll effect on the low cycle impact fatigue properties of pure aluminum plate, the tensile impact fatigue tests were carried out within 100 impact blows using the two types of specimens. The specimen of the first type had the surface layer which retained the roll effect, and the specimes of the second type were fully annealed ones and were consisted of the grains of about 30μ diameter. Observations were made on the impact stress pattern and the elongation of the specimens during the tests. The surface deteriorations due to the plastic strain were also examined by means of an optical microscope and by an X-ray diffractometer. From these results, the impact fatigue behaviors of both types of specimens were compared and discussed from various view points.