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- W2912700896 abstract "Abstract Tuning the piezoresistive behavior of conductive polymeric composites requires an in-depth understanding of the structure-property relationships and deformation mechanisms at the polymer/conductive filler interface. In this paper, the unknown sources of nonlinearity (as frequently observed for specific material systems) are identified for the flexible and stretchable chopped carbon fiber (CCF)/polydimethylsiloxane (PDMS) conductive yarns. It is found that under cyclic loading the resistance initially reduces (negative piezoresistivity) up to a specific transition strain, beyond which positive piezoresistivity is observed until the onset of unloading. Apart from the opposing effects of fiber separation and Poisson's effect, the results suggest that such nonlinearity stems from carbon fiber (CF) buckling induced by CCF/PDMS interfacial friction upon unloading. Nevertheless, a low percolation threshold (1.41 wt%) was attained along with high sensitivity (gauge factors as high as ∼60 in cyclic loading) and stretchability (up to 25%). These characteristics make the CCF/PDMS sensors suitable for 3D-printable inks and stain sensing applications. For the latter, the sensors were integrated with a picture frame shear test setup to monitor the strain along the yarns in fiberglass/polypropylene fabrics subjected to Picture Frame test. Also, the capability of the sensors was demonstrated while used as wearable devices for detecting human joint motion." @default.
- W2912700896 created "2019-02-21" @default.
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- W2912700896 date "2019-05-01" @default.
- W2912700896 modified "2023-10-14" @default.
- W2912700896 title "Piezoresistive sensing in chopped carbon fiber embedded PDMS yarns" @default.
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- W2912700896 doi "https://doi.org/10.1016/j.compositesb.2019.01.090" @default.
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