腐蚀损伤对典型铝合金结构疲劳寿命的影响研究

目的研究严酷服役条件下飞机结构的寿命衰减问题。方法以飞机关键结构模拟件为研究对象，基于编制的某机场环境加速试验谱进行当量加速腐蚀试验，采用MTS810材料试验系统进行预腐蚀后的疲劳试验。结果通过对试验结果的分析，确定了关键结构疲劳寿命腐蚀影响系数与腐蚀损伤尺寸之间的对应关系。结论关键结构腐蚀损伤宽度与疲劳寿命腐蚀影响系数相关性最好。

Relationship between the Corrosion Influencing Factor of Fatigue Life and the Corrosion Damage Size of Aircraft Airframe Critical Structure

Objective To study the effect of service environment on aircraft structure.Methods The critical structure coupons of aircraft airframe were tested, and accelerated corrosion experiment was carried out based on the accelerated corrosion spectrum of a field airport environment. Test of fatigue after pre-corrosion was conducted using MTS810. ResultsThrough analysis of testing results, the relationship was determined, between the corrosion influencing factors of fatigue life and the corrosion damage size of aircraft airframe critical structure. Conclusion The result shows that there is a significant correlation between the corrosion damage width and the corrosion influencing factor of fatigue life of aircraft critical structure.