飞机结构疲劳关键部位损伤与可靠性评定技术

Technology on evaluating damage and reliability of aircraft structure fatigue critical parts

从分析结构疲劳失效和损伤演化的本质特征,得到了以疲劳损伤描述的结构可靠性分析模型,并在此基础上,给出了使用过程中飞机结构疲劳关键部位的损伤与可靠性评定技术和相应参数指标.该方法以一般环境下全尺寸结构疲劳试验结论的完整资料和服役中记录的每架飞机飞参数据为主要依据,能够实现利用每架飞机的飞参适时地对其结构损伤状态与可靠性给出评估,满足飞机结构疲劳损伤监控技术的需求.最后结合某型飞机的具体服役情况给出评估示例.研究表明,采用该方法可适时地计算出某型飞机结构的疲劳损伤和可靠性,并可为使用方合理决策提供重要参考信息,以在保障结构安全可靠的前提下合理地调配使用飞机.

Analysis was started with character of fatigue failure and damage evolution of structure. The structure reliability analysis model which expressed in fatigue damage of critical parts was given. The damage and reliability evaluation technique and corresponding parameter index of fatigue critical parts of in service aircraft were presented by basing on above model. The method based on integrated data of full-scale fatigue test on aircraft structure at room environment and flight parameters of every aircraft recorded in service. The method can carry out timely calculating structure damage state and reliability using flight parameters of every aircraft, and can satisfy with requirement of fatigue damage monitoring technique of aircraft in service. Finally the engineering demonstration based on usage of certain type aircraft was given. The method can be applied to timely evaluating structure damage and reliability of certain type aircraft, as also can provide important service information of every aircraft structure in service for the user. Then it is possible to allocating and using every aircraft in service reasonable with the precondition of ensuring aircraft structure safely.