Strain and Damage Monitoring of CFRP Laminates by Means of Electrical Resistance Measurement

Todoroki, Akira; Ueda, Mikito; Hirano, Yoshiyasu

doi:10.1299/jmmp.1.947

Cited by 43 publications

(28 citation statements)

References 94 publications

(62 reference statements)

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“…electrical resistance change method (ERCM) [34,5,6], electrical impedance spectroscopy (EIS) [32,17,57] and electrical impedance tomography (EIT) [28,15,56].…”

Section: Impedance-based Cfrp Composite Characterizationmentioning

confidence: 99%

“…Many researchers have utilized the electrical resistance change method to detect damage in CFRP composites [34,5,6]. ERCM applies a DC or AC current with constant amplitude at a particular frequency and measures the surface potential ( Fig.…”

Section: Impedance-based Cfrp Composite Characterizationmentioning

confidence: 99%

“…electrical resistance or impedance methods) [34,5,6] have been found to be fast and low-cost methods that are suitable for offline or online inspection of carbon fiber reinforced polymer (CFRP) composites. Electrical impedance tomography (EIT) can be non-invasive and used for in-situ and real-time monitoring of structural integrity in terms of electrical impedance.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Laser-based surface preparation of composite laminates leads to improved electrodes for electrical measurements

Almuhammadi

Selvakumaran

Alfano

et al. 2015

Applied Surface Science

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Laserbased surface preparation of composite laminates leads to improved electrodes for electrical measurements, Applied Surface Science (2015), http://dx.doi.org/10.1016/j.apsusc. 2015.10.086 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Page 1 of 32 A c c e p t e d M a n u s c r i p t AbstractElectrical impedance tomography (EIT) is a low-cost, fast and effective structural health monitoring technique that can be used on carbon fiber reinforced polymers (CFRP). Electrodes are a key component of any EIT system and as such they should feature low resistivity as well as high robustness and reproducibility. Surface preparation is required prior to bonding of electrodes. Currently this task is mostly carried out by traditional sanding. However this is a time consuming procedure which can also induce damage to surface fibers and lead to spurious electrode properties. Here we propose an alternative processing technique based on the use of pulsed laser irradiation. The processing parameters that result in selective removal of the electrically insulating resin with minimum surface fiber damage are identified.A quantitative analysis of the electrical contact resistance is presented and the results are compared with those obtained using sanding.

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“…electrical resistance change method (ERCM) [34,5,6], electrical impedance spectroscopy (EIS) [32,17,57] and electrical impedance tomography (EIT) [28,15,56].…”

Section: Impedance-based Cfrp Composite Characterizationmentioning

confidence: 99%

Section: Impedance-based Cfrp Composite Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laser-based surface preparation of composite laminates leads to improved electrodes for electrical measurements

Almuhammadi

Selvakumaran

Alfano

et al. 2015

Applied Surface Science

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“…Several SHM techniques have been proposed utilizing an optical fiber sensor (1), (2) , piezoelectric sensor (3), (4) , a frequency change (5), (6) and electric property changes (7) of CFRP. Embedding an optical fiber sensor into the laminate may cause damage and repair is difficult.…”

Section: Introductionmentioning

confidence: 99%

“…Strain and damage monitoring can be done by measuring the change in an electric property of CFRP (7)~ (15) . No additional sensor is, therefore, required for the method as CFRP is used as a sensor.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Study on Delamination Identification in Quasi-Isotropic CFRP Laminate by Residual Stress Release Using the Electric Potential Change Method

Ueda

Todoroki

2008

JMMP

Self Cite

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The electric potential change method (EPCM) was applied to identify delamination in quasi-isotropic carbon fiber reinforced plastic (CFRP) laminate. The authors have introduced EPCM previously to detect delamination in a cross-ply CFRP laminate although it was difficult to apply to quasi-isotropic CFRP laminate because of its complicated electric anisotropy. In this study, a new concept was introduced to resolve this problem. Residual stress that developed during the curing process in CFRP laminate fabrication was utilized. This residual stress was released locally by the creation of a delamination which resulted in a local strain variation on the laminate surface. Since the electric conductivity of CFRP may change with applied strain because of its piezoresistivity a CFRP cloth was used as a strain sensor. The release of residual stress was detected as an electric potential change of the CFRP cloth by applying electric current to the laminate. The delamination location and size were estimated from electric potential changes. A finite element study was performed to investigate the applicability of the method. Two steps of finite element analysis were performed to calculate the electric potential change due to delaminations and matrix cracks, structural analyses to calculate strain variation due to release of the residual stress by the delamination and then electric field analyses to calculate electric potential change due to strain variation. The delamination location and size were estimated from electric potential changes using a response surface methodology. A numerical simulation was successful in estimating delaminations in quasi-isotropic CFRP laminate.

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On the anisotropic behavior of electrodes for electrical‐based monitoring of CFRP laminated composites

2018

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Electrical impedance tomography (EIT) is a promising structural health monitoring technique for carbon fiber‐reinforced polymer (CFRP) composites. EIT technique has been specifically adopted as a non‐destructive testing method along with the electrical characterization methods. Electrodes are the primary component in any EIT system because they act as an interface connecting the instrument/hardware to the structure under inspection. Simulation of electrical inspection of CFRP usually assumes the electrodes to be electrically isotropic interfaces. We show here that such isotropic assumption is a very poor approximation. We experimentally investigated the electrodes contact impedance behavior on CFRP‐laminated composite specimens for different surface processing (sanding, CO2 laser, and Yb‐fiber laser). The effective electrical responses of electrodes are characterized in‐depth, so an accurate description can be proposed. Our findings emphasize that the electrodes contact impedance is strongly anisotropic, and varies largely between the on‐axis (along surface fibers) and the off‐axis (bias and perpendicular to the surface fibers) for all tested surface processing. POLYM. COMPOS., 2018. © 2018 Society of Plastics Engineers

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Strain and Damage Monitoring of CFRP Laminates by Means of Electrical Resistance Measurement

Cited by 43 publications

References 94 publications

Laser-based surface preparation of composite laminates leads to improved electrodes for electrical measurements

Laser-based surface preparation of composite laminates leads to improved electrodes for electrical measurements

Finite Element Study on Delamination Identification in Quasi-Isotropic CFRP Laminate by Residual Stress Release Using the Electric Potential Change Method

On the anisotropic behavior of electrodes for electrical‐based monitoring of CFRP laminated composites

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