Fatigue tests and damage model development on Al-Si-Mg aluminum alloys with low-velocity impact pit

摘要

An experimental-analytical investigation was conducted to study the fatigue properties of ZL114A aluminum alloy with low-velocity impact pit. The analysis of the fracture surfaces indicated that the cracks initiated at the position with tension residual stress rather than at the pit. Considering that the pit depth has a direct correlation with the magnitude of residual stresses, a new damage evolution equation involving a dimensionless parameter about pit depth was proposed to reflect the detrimental effect of pit. The proposed model was applied to the fatigue life prediction of specimens and hole plates with impact pit, and the result was within a twice-error band compared with the experimental data.