2022
DOI: 10.3390/s22218168
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Comparison of the Capacitance of a Cyclically Fatigued Stretch Sensor to a Non-Fatigued Stretch Sensor When Performing Static and Dynamic Foot-Ankle Motions

Abstract: Motion capture is the current gold standard for assessing movement of the human body, but laboratory settings do not always mimic the natural terrains and movements encountered by humans. To overcome such limitations, a smart sock that is equipped with stretch sensors is being developed to record movement data outside of the laboratory. For the smart sock stretch sensors to provide valuable feedback, the sensors should have durability of both materials and signal. To test the durability of the stretch sensors,… Show more

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“…9,10 How the material properties affect the signal properties remains unclear, but viscoelastic stretch sensors that were used to measure activities of daily living, subsequent to subjection of HCF, exhibited drift in their output over time potentially due to the retention of a modicum of strain with each cycle. 78 Further, the shape of the peak stress in the stress-life curve suggests that the Rabinowitz-Beardmore model curve 9 may be general enough to apply to all polymers, not just thermoplastics, provided that the model is adapted to account for elastomeric phenomena such as cross-link density, polymer chain debonding, polymer chain rearrangement, and cross-link breakdown. 19,20 In broad terms, nano-to microstructurally small crack incubation may begin with the initial monotonic overload and transition stages, and continue until long crack propagation results in failure of the material 5,9,79 but, as Opp et al 7 have noted, these results may depend on the polymer being tested, and more studies assessing the effect of fatigue on the microstructure of the dielectric elastomer sensors is needed to determine the times needed to incubate and propagate the cracks.…”
Section: Discussionmentioning
confidence: 99%
“…9,10 How the material properties affect the signal properties remains unclear, but viscoelastic stretch sensors that were used to measure activities of daily living, subsequent to subjection of HCF, exhibited drift in their output over time potentially due to the retention of a modicum of strain with each cycle. 78 Further, the shape of the peak stress in the stress-life curve suggests that the Rabinowitz-Beardmore model curve 9 may be general enough to apply to all polymers, not just thermoplastics, provided that the model is adapted to account for elastomeric phenomena such as cross-link density, polymer chain debonding, polymer chain rearrangement, and cross-link breakdown. 19,20 In broad terms, nano-to microstructurally small crack incubation may begin with the initial monotonic overload and transition stages, and continue until long crack propagation results in failure of the material 5,9,79 but, as Opp et al 7 have noted, these results may depend on the polymer being tested, and more studies assessing the effect of fatigue on the microstructure of the dielectric elastomer sensors is needed to determine the times needed to incubate and propagate the cracks.…”
Section: Discussionmentioning
confidence: 99%