Approach of calendar life extension for aircraft structures
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摘要: 针对若干现役飞机年飞行小时数较低的情况,提出了一种充分发挥其疲劳寿命潜力的日历寿命延寿方法.通过对达到日历总寿命的结构损伤状况分析,以一般环境下疲劳定寿结论和日历寿命指标为前提,以考虑腐蚀环境的寿命评定技术为基础,依据飞机的飞行和修理记录,确定结构的疲劳裕度和继续使用年限,从而给出各种典型使用情况下的日历延寿结论.该方法为老龄和现役飞机达到日历总寿命后继续安全有效地服役提供了明确可行的技术途径.Abstract: To extend service life of existing aircrafts approaching the end of their original life at the expiration of calendar life while fatigue life is far from running out due to low operation, a calendar life extension approach was proposed based on evaluating technique for life system of aircraft structures under corrosive condition. Methods of identifying candidates for life extension were discussed. Accumulated damage caused by fatigue and corrosion was analyzed to separate the candidates into different classes. On the basis of fatigue life evaluated in general environment (at room temperature and in laboratory air) and expected calendar repair intervals, the remaining fatigue life that considering the effects of corrosion and continued service years were calculated from loading and repair histories using fatigue life evaluation approach in corrosive environment, from which service life was reliably extended for typical operation. Life extension results along with repair schemes for a wing of a fighter shows effectiveness of the approach.
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Key words:
- service life /
- fatigue /
- corrosion /
- life extension /
- calendar life
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