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为了研究如何利用声发射(AE)技术监测飞机主结构件的腐蚀损伤从而为确定飞机日历寿命提供科学依据。首先介绍了航空铝合金材料在加速腐蚀过程中的AE信号特征,说明如何利用AE技术来监测腐蚀损伤,进而讨论如何对材料的安全性能和剩余寿命进行评估。试验表明, AE能比超声和涡流等常规无损检测方法更早地发现铝合金材料的腐蚀损伤。通过研究加速腐蚀过程中腐蚀损伤程度及腐蚀AE信号随加速腐蚀时间的变化规律,获得了腐蚀损伤与AE参数之间的变化关系。说明AE技术可用于探测早期腐蚀、研究腐蚀发展规律及监测和评估腐蚀损伤方面。
In order to study how to use acoustic emission (AE) technology to monitor the corrosion damage of the main structural parts of the aircraft so as to provide a scientific basis for determining the calendar life of the aircraft. First of all, the characteristics of AE signal of aviation aluminum alloy in accelerating corrosion process are introduced. The AE technology is used to monitor the corrosion damage, and then how to evaluate the safety performance and remaining life of the material is discussed. Experiments show that AE can detect the corrosion damage of aluminum alloy earlier than conventional nondestructive testing methods such as ultrasonic and eddy current tests. The relationship between corrosion damage and AE parameters was obtained by studying the extent of corrosion damage and the variation of corrosion AE signal with accelerated corrosion time. AE technology can be used to detect early corrosion, research on the development of corrosion and monitoring and assessment of corrosion damage.