Modeling and simulation of multiferroic nanostructures with surface effects

具有表面效应的多铁纳米结构的建模和模拟

• 批准号: 198320462
• 负责人: Professor Dr.-Ing. Chuanzeng Zhang
• 金额: --
• 依托单位: Lehrstuhl für Baustatik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/198320462?language=en
• 关键词: Modeling; simulation; multiferroic; nanostructures; surface

This project is focused on the static and dynamic analyses of multiferroic or magnetoelecroelasticnanostructures, in which the coexistence of several order parameters leads to novel physical phenomena and therefore offers the possibilities for design novel multi-functional structures and devices. In particular, the overall mechanical behavior of multiferroic structures at the nanoscale could be totally different from that of their macroscopic counterpart, since surface effects in these structures and devices with a high surface-to-volume ratio play a crucial role and cannot be neglected. Hence, the traditional or classical continuum theories without surface effects may become invalid. The main objectives of the present project are to develop systematically onedimensional and two-dimensional simplified structural theories for multiferroic nanostructures incorporating surface effects, which will be verified by an efficient and accurate numerical simulation tool based on the boundary integral equation or boundary element method. The primary goal of the project is to gain a better understanding and a deeper insight into the mechanical behavior of multiferroic nanostructures and their magnetoelectric effects, all being very important for the design of multiferroic nanostructures. The simplified structural theories and the numerical simulation tool can be conveniently applied to obtain optimized multi-functional multiferroic devices with high performances for innovative engineering applications such as sensors and energy harvesters.

本项目的重点是对多铁性或磁电弹性纳米结构的静态和动态分析，其中多个序参量的共存导致了新的物理现象，从而为设计新型多功能结构和器件提供了可能性。特别是，在纳米尺度下的多铁性结构的整体力学行为可能完全不同于它们的宏观对应物，因为在这些结构和具有高表面积体积比的器件中，表面效应起着至关重要的作用，不能被忽视。因此，没有表面效应的传统或经典连续介质理论可能失效。本项目的主要目标是系统地发展包含表面效应的多铁性纳米结构的一维和二维简化结构理论，这将通过基于边界积分方程或边界元方法的高效和精确的数值模拟工具来验证。该项目的主要目标是更好地理解和更深入地了解多铁性纳米结构的力学行为及其磁电效应，这些对于多铁性纳米结构的设计非常重要。简化的结构理论和数值模拟工具可以方便地应用于获得优化的多功能多铁性器件，具有高性能的创新工程应用，如传感器和能量收集器。