权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Consideration of the charge balances of the ions regarding the behavior of ionic polymer-metal composites (IPMCs): A modeling concept within the framework of the Theory of Porous Media (TPM)

考虑离子聚合物-金属复合材料 (IPMC) 行为的离子电荷平衡：多孔介质理论 (TPM) 框架内的建模概念

基本信息

批准号：
396390451
负责人：
Professor Dr.-Ing. Joachim Bluhm
金额：
--
依托单位：
Institut für Mechanik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/396390451?language=en
关键词：
Consideration charge balances ions regarding

项目摘要

Ionic polymer-metal composites (IPMCs) are classified as smart materials. These multifunctional materials are made up of a network of polymer fibers with bound anions. The pores are filled with liquid and mobile cations. They can change their properties as a result of external influences and/or active energy supply. The deformations of IPMCs result from the relocation of the cations (diffusion/migration) in the material due to an electric field (actuators). In contrast, mechanical fields (force/displacement) generate an electrical voltage (sensors).Inspired by the behavior of biological systems, the development and production of IPMCs is a subject of international research with regard to new applications in the field of engineering disciplines, materials science and medical technology. An open scientific question is the prediction of the behavior of IPMCs, taking into account the balances of the charges of the ions with source terms (divergence of the electric current). In general, the charge densities of the ions are proportional to the corresponding concentrations (balance of charges are free of sources).The aim of the research project is the extension of a developed thermodynamically consistent model for the description of the coupled electro-chemomechanical behavior of IPMCs. The expansion of the multi-phase model within the framework of the Theory of Porous Media (TPM) refers to the consideration of additional terms with respect to the increments of the electrical energies. This approach is intended to show the dependence of the stresses of the ions on the corresponding electrochemical potentials. Furthermore, the influence of the electric current on the charge densities of the ions and on the electrical potential (Gaussian law) is to be analyzed. With respect to the numerical implementation, it is necessary, in comparison with the existing model, to prepare the weak forms of the balance equations of charges of the ions and the balance law of momentum of the cations (anions are bound to the polymer). The diffusion of the mobile cations and, consequently, the deformation behavior of the IPMCs are strongly influenced by the region of the polymer in close proximity to the electrodes. Thus, it is to be expected that a very fine discretization in space and time is required with regard to the FE-simulation. Therefore, the extended model for the use of ParFEAP (parallel finite element program FEAP) is to be processed in conjunction with the high-performance computing system magnitUDE (HPC system at the University of Duisburg-Essen). Numerical simulations with PARFEAP should show the applicability of the developed model. The results will be validated with available experimental data from the literature.

离子聚合物-金属复合材料（IPMCs）属于智能材料。这些多功能材料由具有结合阴离子的聚合物纤维网络组成。孔隙中充满了液体和移动的阳离子。它们可以由于外部影响和/或主动能量供应而改变其性质。IPMC的变形是由于电场（致动器）引起的材料中阳离子的重新定位（扩散/迁移）。相反，机械场（力/位移）产生电压（传感器）。受生物系统行为的启发，IPMC的开发和生产是工程学科、材料科学和医疗技术领域新应用的国际研究课题。一个开放的科学问题是预测IPMC的行为，考虑到离子的电荷与源项（电流的发散）的平衡。在一般情况下，离子的电荷密度是成比例的相应的浓度（电荷的平衡是免费的来源）。该研究项目的目的是扩展开发的电化学一致的模型，用于描述耦合的电化学力学行为的IPMCs。多孔介质理论（TPM）框架内的多相模型的扩展涉及相对于电能增量的附加项的考虑。这种方法旨在显示离子的应力对相应的电化学电势的依赖性。此外，电流对离子的电荷密度和对电势的影响（高斯定律）将被分析。在数值实现方面，与现有的模型相比，需要准备离子电荷平衡方程和阳离子动量平衡定律（阴离子与聚合物结合）的弱形式。移动的阳离子的扩散以及因此IPMC的变形行为受到聚合物紧邻电极的区域的强烈影响。因此，预计FE模拟需要在空间和时间上进行非常精细的离散化。因此，使用ParFEAP（并行有限元程序FEAP）的扩展模型将与高性能计算系统magnitUDE（杜伊斯堡-埃森大学的HPC系统）一起处理。数值模拟与PARFEAP应显示所开发的模型的适用性。结果将与文献中的实验数据进行验证。