Impedance spectroscopy as a tool for moisture uptake monitoring in construction composites during service

Grammatikos, Sotirios; Ball, Richard; Evernden, Mark; Jones, Ryan G.

doi:10.1016/j.compositesa.2017.11.006

Cited by 31 publications

(16 citation statements)

References 66 publications

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“…However, bridges are relatively fragile and prone to wear and damage from the environment [5], particularly in regions featuring complex geological structures or natural disasters such as flooding, earthquakes, or typhoons [6,7]. Therefore, bridges must be safe and serviceable for users [8,9]. As an important part of highway transportation systems, the structural design and construction of bridges are of utmost importance to national development [10,11]; selecting appropriate construction methods is therefore crucial [6,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

An Interval‐Valued Pythagorean Fuzzy Compromise Approach with Correlation‐Based Closeness Indices for Multiple‐Criteria Decision Analysis of Bridge Construction Methods

Chen

2018

Complexity

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The purpose of this paper is to develop a novel compromise approach using correlation-based closeness indices for addressing multiple-criteria decision analysis (MCDA) problems of bridge construction methods under complex uncertainty based on interval-valued Pythagorean fuzzy (IVPF) sets. The assessment of bridge construction methods requires the consideration of multiple alternatives and conflicting tangible and intangible criteria in intricate and varied circumstances. The concept of IVPF sets is capable of handling imprecise and ambiguous information and managing complex uncertainty in real-world applications. Inspired by useful ideas concerning information energies, correlations, and correlation coefficients, this paper constructs new concepts of correlation-based closeness indices for IVPF characteristics and investigates their desirable properties. These indices can be utilized to achieve anchored judgments in decision-making processes and to reflect a certain balance between connections with positive and negative ideal points of reference. Moreover, these indices can fully consider the amount of information associated with higher degrees of uncertainty and effectively fuse imprecise and ambiguous evaluative ratings to construct a meaningful comparison approach. By using the correlation-based closeness index, this paper establishes effective algorithmic procedures of the proposed IVPF compromise approach for conducting multiple-criteria evaluation tasks within IVPF environments. The proposed methodology is implemented in a practical problem of selecting a suitable bridge construction method to demonstrate its feasibility and applicability. The practicality and effectiveness of the proposed methodology are verified through a comparative analysis with well-known compromise methods and other relevant nonstandard fuzzy models.

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Section: Introductionmentioning

confidence: 99%

An Interval‐Valued Pythagorean Fuzzy Compromise Approach with Correlation‐Based Closeness Indices for Multiple‐Criteria Decision Analysis of Bridge Construction Methods

Chen

2018

Complexity

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“…The proposed approach mainly devoted to carbon fiber reinforced composite for primary structures is of high commercial impact, as moisture uptake control is considered as a problem in modern aeronautics. Recent studies performed by Grammatikos et al [3] have begun, very recently, to apply a similar technique on pultruted glass fiber reinforced composite for civil engineering application by using dielectric spectroscopy for evaluation of moisture uptake.…”

Section: Introductionmentioning

confidence: 99%

“…Grammatikos et al [3], still in civil engineering, indicated that dielectric measurements methodology for determination of moisture uptake in carbon fiber reinforced polymers (CFRP) is preferable with respect to the commonly adopted gravimetric methodology, due to complication induced by chemical mass loss.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the dielectric analysis by measurements of the impedance modulus of the CML EEC becomes a viable path for SHM. • Furthermore, as previous studies assessed [3], it is not affected by the disadvantages found in other more traditional methods, such as the gravimetric method, which, moreover, is not suitable for measurements during the operational life of an aircraft. A dedicated sensor network should be applied to the structure in order to monitor its moisture uptake.…”

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confidence: 95%

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An Impedance Measurement Technique for Composite Materials Moisture Level Detection Devoted to Health Monitoring in Aeronautics

et al. 2019

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The current design practice of composite material aeronautical structures imposes the use of knock-down structural material allowables to take into account the high sensitivity to environmental exposure (i.e., moisture, temperature, damages). The “moisture derating factor” comes from specific mechanical test campaign and drastically reduces the advantage of using such materials; but the continuous monitoring of the moisture content of the structure could enable the use of higher design allowables. In the framework of FUSIMCO (Work developed within the frame of the Project FUSIMCO-FUSoliera Ibrida Metallo COmposito-co-financed by MIUR-Italian Ministry of Research with DAC-Campania Aerospace District as beneficiary and Leonardo Company-Aerostructure Division as “prime” partner) project, the aim of this study is to verify the effectiveness of the impedance measurement method as a health-monitoring tool to evaluate the moisture quantity absorbed by an aeronautical composite structure. The method is based on the idea that a composite laminate can be associated with an equivalent electric circuit (EEC). Some electrical characteristics of this EEC can be associated to the moisture content of the laminate. A simple EEC model, mainly capacitive, was used. A frequency sweep was the electric stimulus signal of some electrodes, glued onto the specimens to investigate the EEC parameters variation with respect to the induced moisture content variation (gravimetrically determined). The study confirmed the possibility of effectively using the impedance measurement method as a health-monitoring tool for moisture content evaluation of a composite laminate.

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“…[4][5][6][7][8] This technique has been employed in many fields of research (fuel cells, 9 supercapacitors, 10 construction, 11 corrosion, 12 photovoltaics, 13 etc.). Due to this, impedance equipment can be easily found in many research institutions, and highly accurate and reliable apparatus exist.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity, electrical resistivity, and dimensionless figure of merit (ZT) determination of thermoelectric materials by impedance spectroscopy up to 250 °C

Beltrán-Pitarch

Prado‐Gonjal

Powell

et al. 2018

Journal of Applied Physics

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Impedance spectroscopy has been shown as a promising method to characterize thermoelectric (TE) materials and devices. In particular, the possibility to determine the thermal conductivity λ, electrical conductivity σ, and the dimensionless figure of merit ZT of a TE element, if the Seebeck coefficient S is known, has been reported, although so far for a high-performance TE material (Bi2Te3) at room temperature. Here, we demonstrate the capability of this approach at temperatures up to 250 °C and for a material with modest TE properties. Moreover, we compare the results obtained with values from commercial equipment and quantify the precision and accuracy of the method. This is achieved by measuring the impedance response of a skutterudite material contacted by Cu contacts. The method shows excellent precision (random errors < 4.5% for all properties) and very good agreement with the results from commercial equipment (<4% for λ, between 4% and 6% for σ, and <8% for ZT), which proves its suitability to accurately characterize bulk TE materials. Especially, the capability to provide λ with good accuracy represents a useful alternative to the laser flash method, which typically exhibits higher errors and requires the measurement of additional properties (density and specific heat), which are not necessarily needed to obtain the ZT.

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Impedance spectroscopy as a tool for moisture uptake monitoring in construction composites during service

Cited by 31 publications

References 66 publications

An Interval‐Valued Pythagorean Fuzzy Compromise Approach with Correlation‐Based Closeness Indices for Multiple‐Criteria Decision Analysis of Bridge Construction Methods

An Interval‐Valued Pythagorean Fuzzy Compromise Approach with Correlation‐Based Closeness Indices for Multiple‐Criteria Decision Analysis of Bridge Construction Methods

An Impedance Measurement Technique for Composite Materials Moisture Level Detection Devoted to Health Monitoring in Aeronautics

Thermal conductivity, electrical resistivity, and dimensionless figure of merit (ZT) determination of thermoelectric materials by impedance spectroscopy up to 250 °C

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