Crack size monitoring in necked double shear lugs using the electro-mechanical impedance method

Winklberger, Markus; Kralovec, Christoph; Heftberger, Peter; Schagerl, Martin

doi:10.1117/12.2583208

Cited by 6 publications

(1 citation statement)

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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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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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Monitoring growing cracks in aircraft lugs by means of the electro-mechanical impedance method

Winklberger

Kralovec

Heftberger

et al. 2022

Procedia Structural Integrity

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Development of Aircraft Spoiler Demonstrators for Cost-Efficient Investigations of SHM Technologies under Quasi-Realistic Loading Conditions

2021

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An idealized 1:2 scale demonstrator and a numerical parameter optimization algorithm are proposed to closely reproduce the deformation shape and, thus, spatial strain directions of a real aerodynamically loaded civil aircraft spoiler using only four concentrated loads. Cost-efficient experimental studies on demonstrators of increasing complexity are required to transfer knowledge from coupons to full-scale structures and to build up confidence in novel structural health monitoring (SHM) technologies. Especially for testing novel sensor systems that depend on or are affected by mechanical strains, e.g., strain-based SHM methods, it is essential that the considered lab-scale structures reflect the strain states of the real structure at operational loading conditions. Finite element simulations with detailed models were performed for static strength analysis and for comparison to experimental measurements. The simulated and measured deformations and spatial strain directions of the idealized demonstrator correlated well with the numerical results of the real aircraft spoiler. Thus, using the developed idealized demonstrator, strain-based SHM systems can be tested under conditions that reflect operational aerodynamic pressure loads, while the test effort and costs are significantly reduced. Furthermore, the presented loading optimization algorithm can be easily adapted to mimic other pressure loads in plate-like structures to reproduce specific structural conditions.

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Crack size monitoring in necked double shear lugs using the electro-mechanical impedance method

Cited by 6 publications

References 0 publications

A Flexible Eddy Current TMR Sensor for Monitoring Internal Fatigue Crack

A Flexible Eddy Current TMR Sensor for Monitoring Internal Fatigue Crack

Monitoring growing cracks in aircraft lugs by means of the electro-mechanical impedance method

Development of Aircraft Spoiler Demonstrators for Cost-Efficient Investigations of SHM Technologies under Quasi-Realistic Loading Conditions

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