Electro-Mechanical Impedance Method for Structural Health Monitoring of Space Structures: from Laboratory Experiments to Measurements during Spaceflight

Zagrai, Andrei; Misla, Aaron; Sanchez, John; Powell, Dyllian

doi:10.2514/6.2020-3529

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2023

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“…Ultrasonic guided waves are mostly used for damage monitoring of composite structures, which has a wide monitoring range. They can also be used to monitor bolt looseness [18][19][20][21][22] and fatigue cracks [23,24]. Comparative vacuum sensor monitoring technology and smart coating sensor technology, which have high crack monitoring accuracy, are mainly used to monitor cracks, but they can only monitor surface cracks.…”

Section: Introductionmentioning

confidence: 99%

A Flexible Eddy Current TMR Sensor for Monitoring Internal Fatigue Crack

Yang,

He,

Fan

et al. 2023

Sensors

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This paper proposes a flexible eddy current TMR (FEC-TMR) sensor to monitor the internal crack of metal joint structures. First, the finite element model of the FEC-TMR sensor is established to analyze the influence of the sensor’s crack identification sensitivity with internal crack propagation at different depths and determine the optimal location and exciting frequency of the sensor. Then, the optimal longitudinal spacing and exciting frequency of the sensor are tested by experiment. The experimental results are consistent with the simulation results, which verify the correctness of the simulation model. Finally, the experiment is carried out for internal cracks of different depths to verify that the sensor can monitor internal cracks, and the crack identification sensitivity gradually decreases with the increase in the depth of the crack from the surface.

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