Abstract

The shock wave generates the strain gradient and consequent electric polarization in samples due to the flexoelectric effect during the impact process. At present, some scholars have studied the influence law of different impact velocities, but the influence of different thickness and cross-sectional area of samples on flexoelectric effect is still blank. In this letter, we have studied the voltage variation of barium titanate samples with different thickness and cross-sectional area under a certain impact velocity. The results show that the maximum voltage value caused by flexoelectric effect increases as the thickness increases, which is basically in positive proportion; it decreases with the increase of diameter, which is in inverse proportion. This research will lay a theoretical foundation for the fabrication of flexoelectricity sensor.

摘要

由于冲击过程中的挠曲电效应，冲击波在样品中产生应变梯度和随之而来的电极化。目前，已有学者研究了不同冲击速度的影响规律，但样品不同厚度和截面积对挠曲电效应的影响仍属空白。在这封信中，我们研究了不同厚度和横截面积的钛酸钡样品在一定冲击速度下的电压变化。结果表明，挠曲电效应引起的最大电压值随着厚度的增加而增加，基本呈正比例关系；它随直径的增加而减小，成反比。该研究将为柔性电传感器的制备奠定理论基础。