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针对飞机金属结构在服役过程中的裂纹扩展实时监测需求,提出一种现代表面技术与电位法原理相结合的疲劳裂纹监测研究方案.在结构易出现裂纹的热点部位制备了一种具有绝缘隔离层、导电传感层和封装保护层3层结构的裂纹监测涂层传感器.然后进行了疲劳裂纹监测试验,结果表明:通过分析涂层传感器电阻(电位)的变化可以实现对2A12-T4铝合金连接结构多个部位的裂纹同时进行有效监测.此外,还对表面制备涂层传感器的试样与原始试样的疲劳特性进行了对比研究.结果表明:应用现代表面技术在2A12-T4铝合金表面制备涂层传感器,对其疲劳性影响甚微.
Aiming at the requirement of real-time monitoring of the crack propagation in the service life of aircraft metal structure, a research program of fatigue crack monitoring based on the combination of modern surface technology and potentiometric method is proposed.An insulating insulator layer , The conductive sensing layer and the package protection layer 3 layer structure crack monitoring coating sensor.Then fatigue crack monitoring test results show that: by analyzing the coating sensor resistance (potential) changes can be achieved on the 2A12-T4 aluminum alloy connection The structure of multiple parts of the crack at the same time effective monitoring.In addition, the preparation of the surface of the coating sensor samples and the fatigue properties of the original sample were compared.The results show that: the use of modern surface technology 2A12-T4 aluminum alloy surface preparation Coating sensors have little effect on their fatigue.