Residual Fatigue Life Analysis of Cracked Aluminum Lithium Alloy Plates Repaired with Titanium Alloy Patches for Different Sizes

摘要

The main issues after selectively repairing an aluminum lithium alloy plate are the crack tip stress intensity factors and the residual fatigue life of the plate. Crack propagation is investigated, based on the software ABAQUS. Stress intensity factors are estimated with the FRANC3D software. The fatigue crack growth rate is calculated with the NASGRO equation and the Paris equation. The fatigue residual life and a-n curve of repair structure are obtained by the post-processing under the conditions of different repair structure sizes. The study demonstrates that a structural repair having a relative length of 50%, relative width of 35.7% and relative thickness of 83.3% increased the residual fatigue life.