Fuzzy corrosion fatigue model for aging aircraft structure reliability

The integrity and safety of aircraft structure are greatly degraded because of corrosion and corrosion fatigue. The failure mechanism of corrosion and fatigue is very complicated and combined with randomness and fuzziness. For precisely describing the corrosion fatigue life of aircraft structure, based on the obtained investigating service data of the again aircraft, a fuzzy reliability approach is proposed in this paper. Meanwhile, the effects of the pit aspect ratio, the crack aspect ratio and all fuzzy factors on corrosion fatigue life of aircraft structure are discussed as well. Application was proved this methodology is working well in accessing the corrosion fatigue reliability of aging aircraft structure.