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Temperature and time dependence of the electro-mechanical properties of flexible active fiber composites

机译：柔性活性纤维复合材料的机电性能的温度和时间依赖性

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摘要

Active fiber composites (AFCs) are comprised of piezoelectric fibers embedded in a polymeric matrix. AFCs use interdigitated electrodes, which produce electric field lines parallel to the fiber direction, thus taking advantage of the larger d(33) piezoelectric coefficient. The polymer volume content of the AFCs is generally more than 50%; since polymers tend to have behaviors affected by their viscoelastic characteristics especially at elevated temperatures, it is necessary to understand the thermo-electro-mechanical behavior of AFCs at different loading rates. In this study, mechanical, electrical and electromechanical properties of AFCs were measured at different isothermal temperatures, namely 25 degrees C, 50 degrees C and 75 degrees C and at different loading rates. The measurements of all the properties of AFCs were done along the fiber direction. It was found that at higher temperatures, the modulus and tensile strength decreased for all strain rates and the strain at failure increased. The remnant polarization increased with decrease in frequency and increase in temperature; however, the coercive field decreased with temperature and was not affected by the frequency. Due to the viscoelastic behavior of the epoxy, the piezoelectric coefficient d(33) increased at higher temperature and lower frequency. It was also noted that this coefficient is dependent on the magnitude of the electric field.
机译：活性纤维复合材料（AFC）由嵌入聚合物基体中的压电纤维组成。 AFC使用叉指式电极，它们产生平行于纤维方向的电场线，因此利用了较大的d（33）压电系数。 AFC的聚合物体积含量通常超过50％;由于聚合物往往具有受其粘弹性特性影响的行为，尤其是在高温下，因此有必要了解不同加载速率下AFC的热电机械行为。在这项研究中，在不同的等温温度（即25摄氏度，50摄氏度和75摄氏度）以及不同的加载速率下测量了AFC的机械，电气和机电性能。沿纤维方向对AFC的所有特性进行了测量。发现在更高的温度下，所有应变速率下的模量和拉伸强度均降低，而破坏时的应变则提高。剩余极化随着频率的降低和温度的升高而增加;但是，矫顽力场随温度降低而不受频率的影响。由于环氧树脂的粘弹性行为，压电系数d（33）在较高的温度和较低的频率下会增加。还应注意，该系数取决于电场的大小。

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