PREDICTIONS OF ANISOTROPY AFFECTED FATIGUE CRACK PROPAGATION PATHS IN PURE ALUMINUM SHEETS

摘要

The anisotropy affected fatigue cracks that propagate on the rolling direction as mixed mode I-II cracks in CCT-specimens of pure aluminum sheets were predicted using Finite Element Method. The crack growth paths were estimated based on the value of mode I, II, total stress intensity factor range, and the ratio of mode II and mode I energy release rate of the crack. The predictions of crack propagation paths in no-hole specimens and 6-type holed specimens with 0, 30, 45 and 60 degrees of rolling direction towards loading direction were performed and the results were coincided with experimental results.