海洋环境下飞机结构疲劳性能退化规律研究

某型飞机服役了20多年，且大部分日历时间停放在海边机场，腐蚀损伤严重。文中分析了该飞机服役环境特点，采用从该飞机机体上拆卸下来结构材料加工成疲劳试验件，针对外形尺寸完全一致的新、旧材料试件进行对比疲劳试验，分别计算了新旧材料的细节疲劳额定值（DFR），得到了在海洋环境条件下飞机机体结构材料的疲劳性能衰减退化规律。研究结果表明，试件结构形式不同，服役环境对结构细节抗疲劳性能影响程度不一致；结构形式相同的试件，服役环境条件作用后的疲劳性能会下降大约4-16％。

Research on the degradation rule of fatigue performance of aircraft structure under marine environment

A certain type of aircraft in service for over 20 years, and most of the calendar time parked at the seaside airport, got serious corrosion damage. Analysis of the characteristic about aircraft service environment using the body＇s removal from the plane, processed into pieces put into fatigue testing of structural materials, for exactly the same dimensions of the new and old materials, fatigue testing specimen were compared. The details of the calculation of the new and old material fatigue rated value （DFR）, respectively. The marine environment under the conditions of airframe structural materials degradation in the fatigue properties of attenuation laws was gamed. The result shows that the structure of specimen is different, and then the extent of service environment influence the structural details of impact of anti-fatigue performance is inconsistent; Specimen which has the same structure after experiencing the environmental conditions, the fatigue performance will be reduced by about 4-16%