Piezoresistive sensing in chopped carbon fiber embedded PDMS yarns

Montazerian, Hossein; Dalili, Arash; Milani, Abbas S.

doi:10.1016/j.compositesb.2019.01.090

Cited by 51 publications

(28 citation statements)

References 57 publications

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“…Recently, a surge of interest has been directed toward the sensors based on stretchable thin yarns as they can be simply integrated into woven structures such as textiles in health-related applications and fiber reinforced composite fabrics in structural monitoring applications. [41][42][43] For the latter, the sensors cause minimal mechanical deterioration to the base part due to their yarn-like structure. For the above application, a conductive layer can be integrated with elastic fibers through the facile, low-cost, scalable, [44][45][46] and tunable approaches such as dip coating.…”

Section: Stretchable Yarn Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Montazerian

Rashidi

Dalili

et al. 2019

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This study presents a low‐cost, tunable, and stretchable sensor fabricated based on spandex (SpX) yarns coated with graphene nanoplatelets (GnP) through a dip‐coating process. The SpX/GnP is wrapped into a stretchable silicone rubber (SR) sheath to protect the conductive layer against harsh conditions, which allows for fabricating washable wearable sensors. Dip‐coating parameters are optimized to obtain the maximum GnP coating rate. The covering sheath is tailored to achieve high stretchability beyond the sensing limit of 104% for SpX/GnP/SR sensors. Adjustable sensitivity is attained by manipulating SpX immersion times broadening its application for a wide range of strains: Gauge factors as high as two orders of magnitude are achieved at tensile strains greater than ≈40%. The fabricated sensors are tested for two applications: First, the SpX/GnP sensors are integrated into composite fabrics (with no negative impact on the structural integrity of the part) for screening the yarn displacements, resin flow, solidification during the hot press forming process, and structural health monitoring under mechanical loads with minimal cross‐sensitivity to temperature/humidity. Second, the capability of SpX/GnP/SP sensors in detection of a wide range of bodily motions (from the joint motion to arterial blood pressure) is demonstrated.

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Section: Stretchable Yarn Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Montazerian

Rashidi

Dalili

et al. 2019

Small

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“…The magnitude of the piezoresistive effect and the electrical properties vary depending on the dimension, content, and morphology of the filler [ 12 , 13 , 14 ]. In addition, hysteresis may occur due to changes in the position and shape of the fillers in the composite, which are induced by various external deformations [ 15 , 16 , 17 ]. The piezoresistive effect and the hysteresis phenomenon play an important role in the sensors.…”

Section: Introductionmentioning

confidence: 99%

Bending Properties of Carbon Nanotube/Polymer Composites with Various Aspect Ratios and Filler Contents

2020

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The key characteristics of bending sensors are piezoresistive effect, hysteresis, and durability. In this study, to investigate the influence of the aspect ratio and contents of multi-walled nanotubes (MWNTs) on the properties of bending sensors, MWNT/polydimethylsiloxane (PDMS) composites were fabricated with various aspect ratios and filler contents. The MWNTs were uniformly dispersed in the composites using the three-roll milling method. By increasing the bending angle gradually, the sensitivity of each composite was analyzed. Furthermore, discontinuous cyclic bending tests were conducted to investigate the piezoresistive effect and hysteresis. In addition, stable repeatability of the composites was confirmed through continuous cyclic bending tests. As a result, optimal aspect ratios and filler contents have been presented for application in bending sensors of MWNT composites.

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“…Therefore, the measurement of the peak shift makes it possible to determine the stress in the substance . By using a lens focused laser as the incident light to obtain the Raman spectrum only from a micrometer‐sized region, it is possible to measure the stress in a microregion of the interface and stress anisotropy . Furthermore, the tip‐enhanced Raman spectroscopy technique has a potential to detect a fine strain of nanometer order …”

Section: Introductionmentioning

confidence: 99%

“…Most of the stress measurements using Raman spectroscopy have mainly been performed on semiconductors, oxide, ceramics, graphene, and composite materials . As examples of applications to resin samples, the tensile stress in the axial direction of highly oriented fibers such as aramid, polyethylene, natural and synthetic polyamides, polyester/PET, and poly(paraphenylene benzobisoxazole) have been reported.…”

Section: Introductionmentioning

confidence: 99%

Raman imaging of residual stress distribution in epoxy resin and metal interface

Abiko

Kato

Hohjo

et al. 2019

J Raman Spectroscopy

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A method for the distribution analysis of residual stress in epoxy resins by Raman microspectroscopy was developed. By using the uniaxial tensile method, a negative correlation between the peak shift of the aromatic C─H stretching vibration and external stress was obtained. By optimizing the precision of the Raman shift measurement, a reliable stress image was obtained for a bulk epoxy resin. This method was applied to the evaluation of the residual stress distribution in epoxy resin/aluminum bonded materials. Raman spectra imaging revealed that stress concentration strongly occurred in the interface of the cured epoxy resin with aluminum, and it was found that Raman spectra images of the small residual stress of the resin interface were affected by the curing process and physical properties of the epoxy resin. Therefore, Raman spectra imaging would appear to have significant potential as a technique for the evaluation of local thermal residual stress in the interface of multimaterial structures. K E Y W O R D Sadhesion interface, epoxy resin, stress distribution, thermal residual stress

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Piezoresistive sensing in chopped carbon fiber embedded PDMS yarns

Cited by 51 publications

References 57 publications

Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Graphene‐Coated Spandex Sensors Embedded into Silicone Sheath for Composites Health Monitoring and Wearable Applications

Bending Properties of Carbon Nanotube/Polymer Composites with Various Aspect Ratios and Filler Contents

Raman imaging of residual stress distribution in epoxy resin and metal interface

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