Design of a Microscale Optomechanical Load Cell for Micro-/Nanostructured Materials Testing Applications

Leseman, Zayd Chad

doi:10.1007/s13369-021-06019-2

Cited by 5 publications

(3 citation statements)

References 46 publications

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“…To determine the true strain sensitivity, that is, the characteristics of the dependence of the electrical conductivity of the composite on mechanical stress, 38 it is necessary to know the mechanical properties of fibrous composites by measuring experimental values of the force arising in the material during stretching and elastic contraction. [39][40][41] During mechanical tensile tests of the composite, it is possible to reliably measure the tension force of the tape with a known width, and the stress value can be characterized by a conditional load value, since it is impossible to determine the exact knitwear thickness under load. The functions of the conditional stress (load) from the relative elongation during cyclic deformation of composites during stretching and contraction are qualitatively different in Figure 8.…”

Section: Resultsmentioning

confidence: 99%

Production and properties of electrically conductive polymer composites reinforced with cotton threads

Kondratov,

Lozitskaya,

Volinsky

2024

J of Applied Polymer Sci

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The problem of strength loss in electrically conductive composites made with dispersed fillers in the polymer binder is solved by spraying an aerosol of graphite on a textile material with a 3D weave of threads, or on knitwear of fibers with various structure and chemical composition. The loose microstructure of cotton fibers and the developed surface of elastic filaments made of synthetic polymers retain colloidal graphite particles in a layered composite during cyclic deformation. The electrical conductivity of knitwear with graphite changes during stretching due to the reversible displacement of graphite particles, first during straightening and then during stretching of elastic threads. The 130 ± 5 strain sensitivity GF and 12,000 ± 95 кPa−1 stress sensitivity QF of the composites presented in this paper exceed the corresponding parameters of known electrically conductive composites. The combination of a significant change in electrical conductivity with the elasticity of the developed knitwear‐based composite is important for the use in load cells, smart clothes, medical devices, and robotics.

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Section: Resultsmentioning

confidence: 99%

Production and properties of electrically conductive polymer composites reinforced with cotton threads

Kondratov,

Lozitskaya,

Volinsky

2024

J of Applied Polymer Sci

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“…Прогресс робототехники обусловливает необходимость разработки и массового применения различных резисторов, антенн, тензодатчиков и датчиков деформаций из эластичных материалов. Кроме реализации больших деформаций в некоторых случаях к тезодатчикам предъявляются требования совместимости с тканями верхней одежды и нижнего белья, высокой тензочувствительности в широком диапазоне удлинений [1,2].…”

Section: Introductionunclassified

Electrical conductivity of modified fabrics with carbon coating

Lozitskaya,

Kondratov,

Yamilinets

2023

Vestn. Voronež. gos. univ. inž. tehnol.

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Using the example of fabrics and knitwear from a mixture of natural and synthetic polymer fibers, the possibility of obtaining polymer compositions intended for the manufacture of electrically conductive elements for aviation, robotics and so-called "wearable electronics" for medical purposes is shown. The mechanical and electrical properties of fibrous compositions filled with carbon dispersions in various allotropic forms in combination with both soluble and insoluble high-molecular compounds in the form of powders or solutions have been studied. Dispersions of various forms of carbon with a close particle size distribution were selected from among commercially available brands of printing pigments and ingredients of rubber and electrical products. Carbon dispersions were investigated: graphite, carbon black and single-walled nanotubes in the form of a stabilized aqueous suspension. The well-known and justified optimal technological methods of introducing electrically conductive ingredients into the composition of composite materials, taking into account the structure and composition of fabrics. The advantage of spraying electrically conductive graphite particles on the surface of fibers and filaments in combination with the application of solutions and dispersions is shown, which makes it possible to obtain compositions for resistors and strain sensors with a sufficient level of strength and elasticity. The stretching diagram of the sensors and the dependence of the electrical resistance of the composition on the elongation with a high degree of confidence can be divided into two linear sections. The first section in the range of relative tensile strain from 2 to 30% is most consistent with practical application. The coefficient of sensitivity to deformation (GF) of a fabric-based strain gauge does not exceed 10 in the range of deformation in the diagonal direction up to 20%, and the coefficient of sensitivity to deformation on knitwear, regardless of the direction of cutting samples from the canvas, is two orders of magnitude higher and is about 950 to a relative elongation of 30% and 90 in the range of a relative elongation of 30÷45%. The maximum strain sensitivity (QF) of laboratory samples based on knitted fabric, with a deformation of less than 30%, is about 1350 kPa-1 and 4900 kPa-1 at maximum elongation%. The hysteresis of electrical properties with multiple deformations does not exceed 4%.

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“…Requirements for compatibility with outerwear and underwear fabrics and/or the possibility of their manufacture by applying electrically conductive polymer layers to fabric products are imposed on such sensors and strain sensors. The composition of electrically conductive polymer layers and the methods of their formation on tissue are the subject of numerous studies [12][13][14][15]. The pliability and elastic properties of the fabric backing are important.…”

Section: Introductionmentioning

confidence: 99%

Application of strain-sensitive graphite layers on fabric

Lozitskaya

Кондратов

2022

J. Phys.: Conf. Ser.

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The possibility of manufacturing wearable electronics elements, for example, strain gauges or antennas of RFID tags, by applying or locally applying a layer of electrically conductive graphite polymer compositions to the surface of a fabric (knitwear) using printing technologies has been studied. The pliable tape-shaped prints can be used as strain gauges to be placed on human clothing or robot arms. The tensile limits of sensors made on fibrous substrates of various structures using graphite dispersions in the form of powders and aerosols have been established. The strain sensitivity coefficients of the sensors are determined. The advantage of glueless spraying of a liquid composition of graphite in the form of an aerosol onto fibrous materials is shown.

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Design of a Microscale Optomechanical Load Cell for Micro-/Nanostructured Materials Testing Applications

Cited by 5 publications

References 46 publications

Production and properties of electrically conductive polymer composites reinforced with cotton threads

Production and properties of electrically conductive polymer composites reinforced with cotton threads

Electrical conductivity of modified fabrics with carbon coating

Application of strain-sensitive graphite layers on fabric

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