...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Physics >Computational study of filler microstructure and effective property relations in dielectric composites
【24h】

Computational study of filler microstructure and effective property relations in dielectric composites

机译：介电复合材料中填料微观结构与有效性能关系的计算研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Phase field modeling and com puter simulation is employed to study the relations between filler microstructures and effective properties of dielectric composites. The model solves electrostatic equations in terms of polarization vector field in reciprocal space using a fast Fourier transform technique and parallel computing algorithm. Composites composed of linear constituent phases of different dielectric constants are considered. Interphase boundary conditions are automatically taken into account without explicitly tracking interphase interfaces in the composites. Various factors associated with filler microstructures are systematically investigated, including dielectric constant mismatch between fillers and matrix, particle size, shape, orientation, volume fraction, and spatial arrangement as well as directional alignment. Heterogeneous distributions of polarization, charge density, and local electric field are calculated for each composite microstructure, based on which effective dielectric constant and dielectric anisotropy of the composites are determined. It is found that electrostatic interactions among high-dielectric-constant fillers embedded in low-dielectric-constant matrix play critical roles in determining the composite properties, which sensitively depend on filler arrangement and, especially, directional alignment into fibrous microstructures (chains). Such microstructurally engineered composites, whose fillers are not randomly dispersed, exhibit strong dielectric anisotropy despite all constituent components being isotropic.
机译：利用相场建模和计算机仿真研究了填料微观结构与介电复合材料有效性能之间的关系。该模型使用快速傅里叶变换技术和并行计算算法，根据互易空间中的极化矢量场求解静电方程。考虑了由不同介电常数的线性组成相组成的复合材料。自动考虑相间边界条件，而无需明确跟踪复合物中的相间界面。系统研究了与填料微观结构相关的各种因素，包括填料与基体之间的介电常数不匹配，粒径，形状，取向，体积分数，空间排列以及方向排列。计算每个复合材料微结构的极化，电荷密度和局部电场的非均质分布，并以此为基础确定复合材料的有效介电常数和介电各向异性。已经发现，嵌入低介电常数基体中的高介电常数填料之间的静电相互作用在确定复合性能方面起着关键作用，这主要取决于填料的排列，尤其是定向排列成纤维微结构（链）。尽管所有组成成分都是各向同性的，但这种填料没有随机分散的微结构工程复合材料仍表现出很强的介电各向异性。

著录项

  • 来源
    《Journal of Applied Physics》 |2011年第10期|p.681-688|共8页
  • 作者

    Yu U. Wang; Daniel Q. Tan;

  • 作者单位

    Department of Materials Science and Engineering, Michigan Technological University, Houghton,Michigan 49931, USA;

    Dielectrics and Electrophysics Laboratory, GE Global Research Center, One Research Circle,Niskayuna, New York 12309, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号