Influence of impact velocity on flexoelectric effect

Abstract

Flexoelectric effect is the coupling of the inhomogeneous deformation and electric polarization, which exists widely in dielectrics. At present, although some scholars have carried out the experimental research on the measurement of the flexoelectric coefficient under impact loading, there is still no research on the variation law of flexoelectric effect under different impact velocities. In this letter, the voltage variations of barium titanate (BT) samples at different impact velocities are studied. The result shows that when the impact velocity is above 230 m/s, the increasing amplitude of the maximum voltage generated by the flexoelectric effect becomes larger, and when the impact velocity is below 200 m/s, the maximum voltage change is gentle. Finally, the longitudinal flexoelectric coefficient of BT is calculated as 33.57×10-6 C/m, which is consistent with the published measured value. This can provide theoretical guidance for the preparation of dynamic sensors based on flexoelectric effect in the future. Keywords: Flexoelectricity, Impact speed, Voltage