• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Composites Science and Technology >Dynamic capillary impact on longitudinal micro-flow in vacuum assisted impregnation and the unsaturated permeability of inner fiber tows
【24h】

Dynamic capillary impact on longitudinal micro-flow in vacuum assisted impregnation and the unsaturated permeability of inner fiber tows

机译：动态毛细作用对真空辅助浸渍过程中纵向微流的影响以及内部纤维束的不饱和渗透性

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

This paper addresses issues of the synergetic dynamic effect of capillary force on the longitudinal impregnation driven by external pressures, especially under vacuum assistance. An apparatus was designed to detect the axial infiltration along unidirectional fiber bundles which were all aligned closely to give a representation of micro-flow channel of inner fiber tows. The external driving pressures were controlled sufficiently low, 20-60 kPa, on the order of capillary pressures. Based on the analysis of infiltration velocities under different external pressures, dynamic capillary pressures can be determined experimentally. The results showed that capillary pressures, the most important force of microscopic flow through inner fiber yarns, acted as a drag force on the infiltration flow for vacuum assisted penetration into unidirectional fiber bundles. This unique drag effect is very different from traditional unsaturated infiltration, different from the compressed air driving permeation and the theoretical calculated data in this paper. Moreover, values and even signs of the dynamic capillary pressures varied with the fiber fraction of the assemblies as well as the fluid types. Further analysis demonstrated that the function of capillary pressure was closely related to the capillary number (Ca), acting as drag force when Ca larger than a critical value, and as a promotive force with smaller Ca. Consequently, unsaturated permeabilities of the unidirectional fiber bundles were estimated by taking consideration of both dynamic and quasi-static capillary pressures.
机译：本文探讨了毛细作用力在外部压力（特别是在真空辅助下）的驱动下对纵向浸渍的协同动态效应的问题。设计一种设备来检测沿单向纤维束的轴向渗透，这些纤维束都紧密对齐以表示内部纤维束的微流通道。将外部驱动压力控制在足够低的20-60 kPa（按毛细管压力的顺序）。通过分析不同外部压力下的渗透速度，可以实验确定动态毛细压力。结果表明，毛细压力是微观流经内部纤维纱线的最重要力，它是对渗透流的牵引力，用于真空辅助渗透入单向纤维束。这种独特的阻力效应与传统的非饱和渗透有很大不同，不同于压缩空气驱动渗透和本文的理论计算数据。而且，动态毛细管压力的值甚至符号随组件的纤维分数以及流体类型而变化。进一步的分析表明，毛细管压力的功能与毛细管数（Ca）密切相关，当Ca大于临界值时，其作用为阻力，而当Ca较小时，其作用为推动力。因此，通过考虑动态和准静态毛细管压力来估计单向纤维束的不饱和渗透率。

著录项

  • 来源
    《Composites Science and Technology》 |2010年第11期|p.1628-1636|共9页
  • 作者

    Min Li; Shaokai Wang; Yizhuo Gu; Zuoguang Zhang; Yanxia Li; Kevin Potter;

  • 作者单位

    Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    Advanced Composites Centre for Innovation and Science, University of Bristol, University Walk, Bristol BS8 1TR, UK;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A. Polymer-matrix composites (PMCs).E. Resin transfer moulding (RTM)'D. Permeability; B. Porosity/voids;

    机译：聚合物基复合材料（PMC）。树脂传递模塑（RTM）'D。渗透性B.孔隙/空隙;

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