Influence of Surface Effects and Flexoelectricity on Vibration of Piezoelectric Nanobeams
Nanostructured piezoelectric materials hold a promise for the development of novel nanodevices in nanoelectromechanical systems (NEMS) due to their efficient electromechanical coupling.To fulfill their potential applications,it is essential to quantitatively predict their fundamental physical and mechanical properties.In this work,the unique size-dependent properties of piezoelectric nanomaterials,which are believed to attribute to surface effects and flexoelectricity,are investigated through a modified Euler beam model.The surface effects are accounted in a modified beam theory through the surface piezoelectricity model and the generalized Young-Laplace equations,while the flexoelectricity is considered by using the higher-order theory of piezoelectricity.Simulation results on the vibration analysis of piezoelectric nanobeams reveal that the influence of surface effects and flexoelectricity varies with beam thickness and aspect ratio,in particular,such influence becomes more pronounced with the decrease of beam thickness.Vibration analysis also identifies possible frequency tuning of piezoelectric nanobeams by electrical load.In addition,the effect of axial boundary constraints in modeling has been studied,which provides a clear interpretation on the relaxation phenomenon of nanobeams under certain boundary constraints.This study is expected to provide a quantitative understanding on the fundamental physics of piezoelectric materials,thus leading to a better design for piezoelectric nanobeam-based devices.
Surface effects Flexoelectricity Size-dependent properties Piezoelectric nanobeam
Zhi Yan Liying Jiang
Department of Mechanical & Materials Engineering,Western University,London N6A 5B9,Canada
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）