CAJ | 학술논문

采用有限元分析方法研究压电纳米线的形变方式和尺寸对机电转换性能的影响.结果表明，在相同外力作用下，压电纳米线径向弯曲产生的压电势是轴向弯曲的7倍，前者比后者具有更高的机电转换效率.压电纳米线径向弯曲模型中，应力和电场为非均匀分布.纳米线长度的增加可提高其弯曲时产生的压电势，当纳米线长度较短时，应力和电场的非均匀分布使压电势随纳米线长度的增加非线性增大.当纳米线长度超过20 mm时，可忽略非均匀分布对机电转换效率的影响，压电势随纳米线长度的增加线性增加.①
채용유한원분석방법연구압전납미선적형변방식화척촌대궤전전환성능적영향.결과표명，재상동외력작용하，압전납미선경향만곡산생적압전세시축향만곡적7배，전자비후자구유경고적궤전전환효솔.압전납미선경향만곡모형중，응력화전장위비균균분포.납미선장도적증가가제고기만곡시산생적압전세，당납미선장도교단시，응력화전장적비균균분포사압전세수납미선장도적증가비선성증대.당납미선장도초과20 mm시，가홀략비균균분포대궤전전환효솔적영향，압전세수납미선장도적증가선성증가.①
The effect of deformation and length of the nanowires on their electromechanical conversion properties were studied by using finite element analysis (FEA). The results show that the piezoelectric potential generated by radically bent nanowire is 7 times higher as that generated by the axially compressed nanowires. The former one exhibits higher electromechanical conversion efficiency than the latter one. The stress and electrical field are non-uniformly distributed in the radically bending models. The increase of nanowire length will lead to the increase of the piezoelectric potential generated by the bent nanowire. When the nanowire is relatively short,the piezoelectric potential will non-linearly increase with the length of the nanowire due to the non-uniformly distributed stress and electrical field. The influence of the non-uniformly distribution of the stress and electrical field can be neglected when the nanowire is longer than 20 mm,which will result in the linear increase of the piezoelectric potential with the length.