Electromechanical Fatigue Properties of Dielectric Elastomer Capacitive Sensors Based on Plantarflexion of the Human Ankle Joint
Electromechanical Fatigue Properties of Dielectric Elastomer Capacitive Sensors Based on Plantarflexion of the Human Ankle Joint
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DOI：
10.1149/2754-2726/acb21e
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
A. Persons;Carver Middleton;Erin Parker;J. Ball;R. Burch V.;David Macias;C. L. Simpson;S. Elder
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文献类型：
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作者：
A. Persons;Carver Middleton;Erin Parker;J. Ball;R. Burch V.;David Macias;C. L. Simpson;S. Elder
可穿戴拉伸传感器在包括医学和体育在内的许多领域都有潜在的应用，但由于缺乏对传感器材料和传感器产生的信号的高周疲劳（HCF）研究，传感器在重复使用过程中产生的数据的准确性在很大程度上是未知的。为了克服这些限制，使用基于人体生理的参数，拉伸传感器进行准静态测试和HCF，同时捕获信号。然后将传感器产生的应变与测试仪器产生的应变进行比较，结果表明，在准静态条件下，拉伸传感器的输出与测试仪器的输出密切相关;然而，这种相关性在疲劳条件下恶化。这种劣化可能是几个因素的结果，包括材料对疲劳的响应和信号对疲劳的响应之间的不匹配。从材料的角度来看，构成传感器的聚合物的应力-寿命曲线的形状符合聚合物疲劳的Rabinowitz-Beardmore模型。基于这些结果，有必要考虑拉伸传感器的材料特性，以确定传感器的输出对于给定应用的准确度。
Wearable stretch sensors have potential applications across many fields including medicine and sports, but the accuracy of the data produced by the sensors over repeated uses is largely unknown due to a paucity of high-cycle fatigue (HCF) studies on both the materials comprising the sensors and the signal produced by the sensors. To overcome these limitations, using human physiologically-based parameters, stretch sensors were subjected to quasi-static testing and HCF with simultaneous capture of the signal. The strain produced by the sensor was then compared to the strain produced by testing instrument, and the results suggest that the output from the stretch sensors is strongly correlated with output from the testing instrument under quasi-static conditions; however, this correlation deteriorates under fatigue conditions. Such deterioration may be the result of several factors, including a mismatch between the material response to fatiguing and the signal response to fatiguing. From a materials perspective, the shape of the stress-life curve for the polymers comprising the sensors conforms to the Rabinowitz-Beardmore model of polymer fatigue. Based on these results, consideration of the material properties of a stretch sensor are necessary to determine how accurate the output from the sensor will be for a given application.