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针对飞机金属结构在服役过程中的裂纹实时监测需求,提出一种Ti/TiN导电薄膜与电位监测原理相结合的结构裂纹监测研究方案。首先,通过真空离子镀膜技术在结构易于出现裂纹的部位制备了Ti/TiN薄膜传感器。然后,进行了传感器膜层与2A12-T4铝合金基体的损伤一致性验证。结果表明,传感器与基体具有良好的损伤一致性。最后,进行了两组基于Ti/TiN薄膜传感器的裂纹监测试验,主要研究结构裂纹与传感器电位之间的相互关系,并对两组电位监测结果进行对比。结果表明,通过分析Ti/TiN薄膜传感器电位的变化可以实现对2A12-T4铝合金结构裂纹萌生和扩展进行实时监测,两组试验的电位监测结果具有良好的重复性。
Aiming at the requirement of real-time crack detection of aircraft metal structure in service, a research program of structural crack monitoring combining Ti / TiN conductive film and potential monitoring principle is proposed. First, the Ti / TiN thin film sensor was prepared by the vacuum ion plating technique in the structure where cracks easily appeared. Then, the damage consistency between the sensor film and 2A12-T4 aluminum alloy substrate was verified. The results show that the sensor and the substrate have good damage consistency. Finally, two sets of crack monitoring tests based on Ti / TiN thin film sensors were carried out, and the relationship between structural cracks and sensor potentials was mainly studied. The potential monitoring results of two groups were compared. The results show that the crack initiation and propagation of 2A12-T4 aluminum alloy can be monitored in real time by analyzing the change of potential of Ti / TiN thin film sensor. The potential monitoring results of the two groups have good repeatability.