Framework for Strain Measurements at Cyclic Loaded Structures with Planar Elastoresistive Sensors Applying Electrical Impedance Tomography

Wagner, Jonas; Kralovec, Christoph; Kimpfbeck, Daniel; Heinzlmeier, Lukas; Schagerl, Martin

doi:10.1007/978-3-031-07254-3_81

Cited by 3 publications

(6 citation statements)

References 23 publications

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“…In Figure 2 the experimental setup, including the investigated CFRP plate with centrally placed circular hole and the used clamping fixture and hydraulic cylinder, the 3D-DIC system and the EIT measurement system are illustrated. For the EIT reconstructions, an experimental framework, developed by the authors [31], is applied consisting of all components with which the EIT measurements and evaluations are performed. In this arrangement, the wiring of the elastoresistive thin-film sensor (frontside) is routed into a multiplexer, driven by an Arduino ® Mega 2560.…”

Section: Methodsmentioning

confidence: 99%

“…In this arrangement, the wiring of the elastoresistive thin-film sensor (frontside) is routed into a multiplexer, driven by an Arduino ® Mega 2560. This allows a defined current injection pattern in accordance with [31]. As current source the Keithley ® 6620 is used.…”

Section: Methodsmentioning

confidence: 99%

“…These components are also depicted in Figure 2. The principle of the framework is described in Section 2.4, whereas a more detailed description is given in [31][32][33]. As illustrated in Figure 2, the plate is positioned in the center of the clamping fixture and held in place by tightening the clamping screws to avoid slipping out.…”

Section: Methodsmentioning

confidence: 99%

“…By masking the screen beforehand, the sensor size and shape is specified. The chosen SunChemical C2130819D1 Carbon Paste has been used by the authors in a previous study, were it was successfully used as EIT sensor material on a high cycle loaded aluminum specimen [31].…”

Section: Specimenmentioning

confidence: 99%

“…In this way, systematic voltage measurements on the placed electrodes are performed throughout the experiment (see Section 2.2) and give the boundary potential to solve the inverse solution. The EIT evaluation framework for measurement data collection, preprocessing and conductivity reconstruction was developed in a previous work [31]. In this process, the Gauss-Newton one-step algorithm is utilized to solve the differential inverse EIT reconstruction using a maximum a posteriori regularization approach [41][42][43].…”

Section: Damage Evaluation By Electrical Impedance Tomography (Eit)mentioning

confidence: 99%

See 4 more Smart Citations

Damage Evaluation in Plain-Woven CFRP Plate with Circular Hole under Cyclic Tensile Loading Using Electrical Impedance Tomography

Heinzlmeier,

Wagner,

Kimpfbeck

et al. 2024

Preprint

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Understanding and predicting damage progression within thin plain-woven CFRP components is an essential issue for scheduling maintenance intervals and structural inspections, and typically require extensive test series. However, uncertainties always remain and result in conservative design and unnecessary downtimes due to the repeated inspections of a healthy structure. SHM can be used to reduce these uncertainties, as it allows to evaluate the condition of a mechanical structure during operation. Numerous SHM methods are developed , that achieve different levels of damage identification but are often investigated at small coupons with non-realistic structural damages and loading conditions on both, structure and sensor. The present research investigates the electrical impedance tomography (EIT) featuring an elastoresistive thin-film sensor to evaluate damage that propagates from a circular hole in a large plate under cyclic tensile-tensile multi-block loading. Applied fatigue loads were increased multiple times up to a total number of two million cycles. During the loading damage initiated at the hole and continuously propagated into the plate. Repeated EIT evaluations of the applied sensor and validating evaluations by means of digital image correlation clearly revealed the robustness of the hardware and the potential of the SHM method for damage evaluation of plain-woven CFRP components.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Specimenmentioning

confidence: 99%

Section: Damage Evaluation By Electrical Impedance Tomography (Eit)mentioning

confidence: 99%

See 3 more Smart Citations

Damage Evaluation in Plain-Woven CFRP Plate with Circular Hole under Cyclic Tensile Loading Using Electrical Impedance Tomography

Heinzlmeier,

Wagner,

Kimpfbeck

et al. 2024

Preprint

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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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Damage evaluation in plain-woven CFRP plate with circular hole under cyclic tensile loading using electrical impedance tomography

Heinzlmeier,

Wagner,

Kimpfbeck

et al. 2024

Structural Health Monitoring

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Understanding and predicting damage progression within thin plain-woven carbon fiber-reinforced polymer (CFRP) components is an essential issue for scheduling maintenance intervals and structural inspections and typically requires extensive test series. However, uncertainties always remain and result in conservative design and unnecessary downtimes due to the repeated inspections of a healthy structure. Structural health monitoring (SHM) can be used to reduce these uncertainties, as it allows one to evaluate the condition of a mechanical structure during operation. Numerous SHM methods have been developed, which achieve different levels of damage identification but are often investigated at small coupons with nonrealistic structural damages and loading conditions on both structure and sensor. The present research investigates electrical impedance tomography (EIT) featuring an elastoresistive thin-film sensor to evaluate damage that propagates from a circular hole in a large plate under cyclic tensile–tensile multiblock loading. Applied fatigue loads were increased multiple times up to a total number of two million cycles. During the loading, damage initiated at the hole and continuously propagated into the plate. Repeated EIT evaluations of the applied sensor and validating evaluations by means of digital image correlation clearly revealed the robustness of the hardware and the potential of the SHM method for damage evaluation of plain-woven CFRP components.

show abstract

Framework for Strain Measurements at Cyclic Loaded Structures with Planar Elastoresistive Sensors Applying Electrical Impedance Tomography

Cited by 3 publications

References 23 publications

Damage Evaluation in Plain-Woven CFRP Plate with Circular Hole under Cyclic Tensile Loading Using Electrical Impedance Tomography

Damage Evaluation in Plain-Woven CFRP Plate with Circular Hole under Cyclic Tensile Loading Using Electrical Impedance Tomography

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

Damage evaluation in plain-woven CFRP plate with circular hole under cyclic tensile loading using electrical impedance tomography

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