摘要
通过引入腐蚀影响系数,将民机结构实际使用环境下用当量地空地循环数表示的设计目标寿命折算为疲劳损伤相同的一般环境下当量地空地循环数,从而建立腐蚀条件下疲劳分析的细节疲劳额定值(detail fatigue rating,DFR)方法。对于民机结构,腐蚀影响系数包括地面停放预腐蚀、空中飞行环境预腐蚀和空中腐蚀疲劳影响,引入基于腐蚀电化学理论的折算系数,将空中飞行时间等腐蚀损伤地折算为地面停放时间,从而综合考虑地面停放和空中飞行环境预腐蚀影响。针对典型使用情况下的支线客机,对其疲劳关键部位——机身长桁机加接头部位,采用腐蚀条件下DFR方法进行疲劳分析,验证该方法的可行性和合理性。
The designed ＇target life of civil aircraft structure which expressed as equivalent ground-air-ground （GAG） cycles under service environment was converted to GAG cycles under common environment by introducing corrosion influence factor. Then DFR（detail fatigue rating） method of civil aircraft structure fatigue analysis under corrosion condition was established. For the civil aircraft, the corrosion influence factors included pre-corrosion influence on ground, and pre-corrosion and corrosion fatigue influence in the air. The flight hours were converted to ground hours by introducing the covert coefficients based on corrosion electrochemistry theory. Then the pre-corrosion influence on the ground and in the air could take into account synthetically. Aimed at regional airliner under typical usage, fatigue analysis of fuselage truss joint parts was carried out using the DFR method under corrosive condition. Then the validity and rationality of this method were validated.
出处
《机械强度》
EI
CAS
CSCD
北大核心
2008年第5期804-808,共5页
Journal of Mechanical Strength
关键词
腐蚀
腐蚀疲劳
细节疲劳额定值方法
民用飞机
疲劳寿命
Corrosion
Corrosion fatigue
Detail fatigue rating method
Civil aircraft
Faligue life
