摘要
基于Tadokoro理论模型,采用有限元方法对离子交换膜金属复合材料(ionic polymermetal composite, IPMC)的电致动特性进行了数值模拟.通过比较求解控制方程中不考虑水分子扩散阻力和考虑水分子扩散力的两种计算模型,着重探讨和比较了水分子扩散阻力对钠离子携带周围水分子的迁移运动规律和变形过程中各个特征物理量的影响.结果表明,控制方程中增加水分子扩散阻力这一非线性项,对最终的宏观挠曲位移影响并不明显;但是对于钠离子浓度、等效应变、内部平衡力分布等物理量影响很大;这种影响还具有区域性特征,主要集中于电极板附近区域,其他区域影响较弱.控制方程中增加水分子扩散力可以更准确地描述钠离子在迁移过程各物理量的变化规律.
Based on the mechanism of Tadokoro model, the dynamic electro-mechanical response of Ionic polymer-metal composite （IPMC） has been simulated using finite element method. Generally, the water molecule diffusion force is neglected in the most of the former numerical simulation works. In the present paper, the influence of water diffusion resistance force in the process of the movement of sodium ion has been emphatically explored and compared, by introducing two different governing equations： with and without consideration of water diffusion resistance force. The water diffusion resistance force is described as a non-linear term and the corresponding governing equation is solved by iteration. The numerical results show that the water diffusion force has no obvious effect on the displacement, but significant effect on the sodium ion concentration, effective moisture distribution and internal balance force. In addition, the effect exhibits the area selection, especially at the region close to the anode and cathode. The predicting accuracy will be improved by involving this nonlinear component within the governing equation.
出处
《力学学报》
EI
CSCD
北大核心
2009年第3期342-349,共8页
Chinese Journal of Theoretical and Applied Mechanics
基金
香港理工大学基金资助项目(G-YF06).~~
