Fatigue cracks at rivet holes occur at advanced service life of aircrafts due to cyclic loading. As a repair method, adhesively bonded stiffener patches enhance the fatigue life of the structure by delaying crack initiation and reducing crack growth. Combining a crack sensor with a repair patch to a sensor-based stiffener patch allows crack growth reduction and monitoring at the same time. This paper presents a feasibility study on the integration of eddy current sensors into carbon fibre reinforced plastic (CFRP) repair patches. To this end, a specific patch design is developed, and samples are manufactured by ultrasonic fabrication. The performance of the patches is investigated in fatigue tests in terms of ‘crack reinforcement’ and ‘crack detection.’ Both requirements are met. The undertaking of future efforts to tailor the sensor-based repair patch concept to an individual application in aircraft maintenance seems reasonable.

中文翻译：

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将涡流传感器集成到铆钉孔疲劳加固修复补片中

由于循环载荷，铆钉孔处的疲劳裂纹发生在飞机的高级使用寿命。作为一种修复方法，粘合的加劲肋补片通过延迟裂纹萌生和减少裂纹扩展来提高结构的疲劳寿命。将裂纹传感器与修复补片与基于传感器的加强补片相结合，可以同时减少裂纹扩展和监测。本文介绍了将涡流传感器集成到碳纤维增强塑料 (CFRP) 修复补丁中的可行性研究。为此，开发了特定的贴片设计，并通过超声波制造来制造样品。在疲劳测试中根据“裂纹加固”和“裂纹检测”来研究贴片的性能。两个要求都满足。