Electroluminescent strain sensing on carbon fiber reinforced polymer

Qiu, Jun; Idris, Mohamad Kannan; Grau, Gerd; Melenka, Garrett W.

doi:10.1016/j.compositesb.2022.109893

Cited by 10 publications

(2 citation statements)

References 21 publications

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“…This makes it necessary for very high aspect ratios of fibers to be used in order to get reasonable stress transfer, or else the fibers will slip upon load. Some commercial applications of carbon fiber-reinforced polymer matrix composites include aircraft and aerospace systems, automotive systems and vehicles, electronics, government defense and security, pressure vessels, and reactor chambers, among others [71,72]. Progress in the development of low-cost methods to effectively produce carbon fiber-reinforced polymer matrix composites remains very slow [73,74].…”

Section: Resultsmentioning

confidence: 99%

Electrical and mechanical properties of catalytically-grown multi-walled carbon nanotube-reinforced epoxy composite materials

Chen

2023

Preprint

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Carbon nanotubes are excellent candidates for the development of nano-reinforced polymer composite materials. However, assurance of homogeneous dispersion, interfacial compatibility between the carbon nanotube and the polymer, and exfoliation of the aggregates of carbon nanotubes, are required for the successful integration of carbon nanotubes into nanocomposites. The present study is focused primarily upon the electrical and mechanical properties of catalytically-grown multi-walled carbon nanotube-reinforced epoxy composite materials. Particular emphasis is placed upon the effect of carbon loading on the electrical conductivity and the influence of temperature on the loss factor and modulus for the composite materials. The results indicate that the electrical properties of the composite would not be changed from those of the bulk polymer until the average distance between the carbon nanotubes is reduced such that either electron tunneling through the polymer or physical contacts may be formed. Among the challenges introduced in the fabrication of carbon nanotube-filled polymer composites is the necessity to creatively control and make use of surface interactions between carbon nanotubes and polymeric chains in order to obtain an adequate dispersion throughout the matrix without destroying the integrity of the carbon nanotubes. Frequency domain material properties are therefore limited to applications where strains are small and stress is approximately linear with strain and the strain rate. Frequency domain material properties become irrelevant if the material exhibits nonlinear elastic behavior or is subjected to large strains. Depending on the type of polymers in the matrix, above a certain temperature limit, degradation starts or cross-linking starts. The deformed elastic body possess an amount of potential energy equal to the initial amount of potential energy minus the amount of energy irreversibly dissipated. The modulus and loss factor variables of a damping material are highly dependent upon the temperature of the damping material and the vibration frequency. Because of their viscoelastic nature, the stress and strain in viscoelastic materials are not in phase, and, in fact, exhibit hysteresis. The resonant frequency is related to the modulus of the catalytically-grown multi-walled carbon nanotube-reinforced epoxy composite. Keywords: Composite materials; Electrical properties; Mechanical properties; Carbon nanotubes; Electrical conductivity; Loss modulus

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Section: Resultsmentioning

confidence: 99%

Electrical and mechanical properties of catalytically-grown multi-walled carbon nanotube-reinforced epoxy composite materials

Chen

2023

Preprint

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“…The composite structural element configurations determine the strain-sensing capability and attributes of continuous carbon fibre polymer composites [149][150][151][152]. The strain sensitivity of continuous unidirectional carbon-fibre-reinforced epoxy composites has been reported in the fibre direction.…”

Section: Graphene-based Self-sensing Geosyntheticsmentioning

confidence: 99%

Smart Geosynthetics and Prospects for Civil Infrastructure Monitoring: A Comprehensive and Critical Review

et al. 2023

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Civil infrastructure monitoring with the aim of early damage detection and acquiring the data required for urban management not only prevents sudden infrastructure collapse and increases service life and sustainability but also facilitates the management of smart cities including smart transportation sectors. In this context, smart geosynthetics can act as vital arteries for extracting and transmitting information about the states of the strain, stress, damage, deformation, and temperature of the systems into which they are incorporated in addition to their traditional infrastructural roles. This paper reviews the wide range of technologies, manufacturing techniques and processes, materials, and methods that have been used to date to develop smart geosynthetics to provide rational arguments on the current trends and utilise the operational trends as a guide for predicting what can be focused on in future researches. The various multifunctional geosynthetic applications and future challenges, as well as operational solutions, are also discussed and propounded to pave the way for developing applicable smart geosynthetics. This critical review will provide insight into the development of new smart geosynthetics with the contribution to civil engineering and construction industries.

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Soft Sensors via Conductive Textile Stitching: Enabling Strain, Tactile, and Volumetric Sensing

Seong,

Lee,

Han

2024

Adv Materials Technologies

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In fields such as wearable technology and soft robotics, sensors that detect bending and pressure using flexible materials are becoming essential. This study aims to develop textile sensors using stitching methods with conductive yarn. Four types of sensors introduced: tensile and tactile sensors with rubber bands, flex sensors with films, and volumetric sensors with balloons. High sewing density and multi‐layer design improve performance. Experiments reveale a gauge factor (GF) of 1.52 for the multi‐layered tensile sensor under 11% strain, indicating a 20% improvement over single‐layer sensors. Flex sensors effectively detect resistance changes due to curvature, varying with bending velocity. Volumetric sensors demonstrate their adaptability in many shapes and materials with response times under 1 s. There is significant potential for these flexible and adaptable soft sensors in the healthcare and medical industries, especially due to their easy integration with wearable devices.

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Electroluminescent strain sensing on carbon fiber reinforced polymer

Cited by 10 publications

References 21 publications

Electrical and mechanical properties of catalytically-grown multi-walled carbon nanotube-reinforced epoxy composite materials

Electrical and mechanical properties of catalytically-grown multi-walled carbon nanotube-reinforced epoxy composite materials

Smart Geosynthetics and Prospects for Civil Infrastructure Monitoring: A Comprehensive and Critical Review

Soft Sensors via Conductive Textile Stitching: Enabling Strain, Tactile, and Volumetric Sensing

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