Failure mode and mechanism of flexible eddy current array sensor in crack monitoring of metallic bolt hole
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摘要: 柔性涡流阵列传感器在集成实施金属螺栓孔孔边裂纹监测的过程中，会受到结构装配应力、工作应力等因素的影响，为提高传感器的耐久性，进行了集成后的有限元应力分析和裂纹监测试验，研究了传感器的失效模式和失效机理。试验结果表明，传感器容易在被监测金属结构裂纹对应区域出现裂纹或者线圈导线断裂，且传感器裂纹的走向与被监测金属结构裂纹的走向基本一致；传感器与被监测金属结构之间的静摩擦力、被监测金属结构裂纹区域较大的应力和变形是导致传感器失效的主要原因。Abstract: When the flexible eddy current array sensor was integrated to monitor cracks in metallic bolt hole edge, the sensor would suffer assembly stress and working stress from the metallic structure. In order to increase durability of the sensor, the failure mode and mechanism in monitoring cracks were investigated by finite element stress analysis and crack monitoring experiment. It was shown that the cracks and coil wire fracture would appear in the sensor corresponding to crack zone of metallic structure, and the propagation trend of crack in the sensor is similar to the crack in the metallic structure. It can be concluded that the static friction force between the sensor and the metallic structure, and the stress and distortion in crack zone of metallic structure lead to the failure of the sensor.
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