Strain sensing behaviors of epoxy nanocomposites with carbon nanotubes under cyclic deformation

Cao, Xiao‐Han; Wei, Xiangdong; Li, Guojie; Hu, Chao; Dai, Kun; Guo, Jiang; Zheng, Guoqiang; Liu, Chuntai; Shen, Changyu; Guo, Zhanhu

doi:10.1016/j.polymer.2017.01.068

Cited by 100 publications

(47 citation statements)

References 53 publications

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“…There are many factors affecting the mechanical properties of polymer matrix composites, including the dispersion of fillers, the combination of fillers and polymer matrix, crack propagation, force transfer, energy dissipation, and so on . As expected, the key factor for improving the mechanical performance is the dispersion of the reinforcement in the polymer matrix . Figures and provide strong evidences to support this conclusion.…”

Section: Resultssupporting

confidence: 55%

Enhanced Solid Particle Erosion Properties of Thermoplastic Polyurethane‐Carbon Nanotube Nanocomposites

Dong

Wang

Liu

et al. 2019

Macro Materials & Eng

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A co‐coagulation method combined with hot pressing technique is successfully applied to fabricate thermoplastic polyurethane (TPU) nanocomposites with different contents of carbon nanotubes (CNTs). Obviously, the mechanical and thermal properties of the nanocomposites are improved with increasing the CNT content. In addition, the existence of hydrogen bonding between CNTs and polymer matrix is demonstrated. Furthermore, the influences of impact parameters on solid particle erosion behavior are investigated systematically. The surface roughness and line roughness are also investigated to illustrate the mechanism of solid particle erosion. As elastic nanocomposites, the maximum and minimum erosion rate (ER) occur at 30° and 90°. The ER is relatively small when the impact velocity is at 10 m s−1, then is increased rapidly between 20 and 30 m s−1. As the size of impact particles increases to 300 µm, a rapid increase of ER occurs between 10 and 20 m s−1. All these results indicate CNTs improve the erosion resistance of TPU matrix.

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Section: Resultssupporting

confidence: 55%

Enhanced Solid Particle Erosion Properties of Thermoplastic Polyurethane‐Carbon Nanotube Nanocomposites

Dong

Wang

Liu

et al. 2019

Macro Materials & Eng

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“…This effect could be attributed to the viscoelastic effect of stress relaxation accompanied by thermal heating due to a mild Joule effect. During cycling deformation the progressive reduction of resistance is attributed to extension-retraction cycles, that gradually form a better conductive network, due to the partial mobility of the polymeric matrix, as previously observed for PP, PLA, TPU, and epoxy (Zhang et al, 2013;Zhao et al, 2013;Moriche et al, 2016b;Cao et al, 2017).…”

Section: Long Term Testing Creep and Cyclic Loadingsupporting

confidence: 61%

“…These results suggest a pre-mechanical conditioning of 3D products by specific cyclic loading at controlled strain in dependence on the required applications (controlled max strain and/or max stress). The same comments were presented by various authors (Zhang et al, 2013;Zhao et al, 2013;Cao et al, 2017) with the indication of stabilization of piezoelectrical behavior during cycling loading, due to a competitive disruption and reformation of new electrical paths.…”

Section: Long Term Testing Creep and Cyclic Loadingsupporting

confidence: 55%

Fused Filament Fabrication of Piezoresistive Carbon Nanotubes Nanocomposites for Strain Monitoring

2020

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Conductive carbon nanotubes (CNT)/acrylonitrile butadiene styrene (ABS) nanocomposites parts were easily and successfully manufactured by fused filament fabrication (FFF) starting from composite filaments properly extruded at a laboratory scale. Specific specimens for strain monitoring application were properly evaluated in both short term and long term mechanical testing. In particular, samples of ABS filled with 6 wt.% of CNT were additively manufactured in two different infill patterns: HC (0 • /0 • ) and H45 (−45 • /+45 • ). The piezoresistivity behavior was investigated under various loading conditions such as ramp tensile tests at different rate and extension, and also creep and cyclic loading at room temperature. Experimental work revealed that the resistance changes in the conductive samples were properly detectable during stress or strain modification, as consequence of damage and/or reassembling of the percolation network. The measurement of the gauge factor in various testing conditions evidenced an initial higher sensitivity of the 3D-built parts within H45 pattern in comparison to the correspondent HC counterparts. The CNT conductive network path in the investigated samples seems to be reformed during creep and cycling experiments, showing a progressive reduction of gauge factor that seems to stabilize at about 2.5 for both HC and H45 samples after long term testing. These findings suggest that conductive CNT/ABS nanocomposites at 6 wt.% of loading can be successfully processed by FFF to produce stable strain sensors in the range −25 • and +60 • C, as confirmed by the constancy of resistivity in these temperatures.

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“…We embedded the carbon nanotube lines into the silica gel polymer to form the mesh model, so this kind of arti cial skin could transfer the strain [13] source to the sensor network; therefore, the skin can get the information promptly.…”

Section: Methodsmentioning

confidence: 99%

Electric Conductivity and Piezoresistivity of Carbon Nanotube Artificial Skin Based on the Design of Mesh Structure

Wen

Wang

et al. 2018

Advances in Materials Science and Engineering

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is paper introduces a new method of sensing pressure by using carbon nanotube yarns which are embedded in artificial skin, based on the design of the mesh structure. With the sensing technology, a kind of mesh model has been established for piezoresistive effect detection of carbon nanotube yarns in artificial skin. By analyzing the sensing characteristics of carbon nanotube yarns, we can conclude that the artificial skin embedded with yarns in a mesh model could be used for sensing pressure. It may cover the surface of the robot and has significant theoretical as well as practical value for intelligent robot research in the future.

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Strain sensing behaviors of epoxy nanocomposites with carbon nanotubes under cyclic deformation

Cited by 100 publications

References 53 publications

Enhanced Solid Particle Erosion Properties of Thermoplastic Polyurethane‐Carbon Nanotube Nanocomposites

Enhanced Solid Particle Erosion Properties of Thermoplastic Polyurethane‐Carbon Nanotube Nanocomposites

Fused Filament Fabrication of Piezoresistive Carbon Nanotubes Nanocomposites for Strain Monitoring

Electric Conductivity and Piezoresistivity of Carbon Nanotube Artificial Skin Based on the Design of Mesh Structure

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