首页> 外文期刊>RSC Advances >Poromechanical modeling of moisture induced swelling anisotropy in cellular tissues of softwoods
【24h】

Poromechanical modeling of moisture induced swelling anisotropy in cellular tissues of softwoods

机译:水分诱导软木细胞组织肿胀各向异性的多孔机械建模

获取原文
获取原文并翻译 | 示例
           

摘要

Experimental studies reveal that softwoods exhibit different swelling patterns at the cellular scale depending on the position of the tracheid cells within the growth ring. Thin-walled earlywood cells show anisotropic swelling behavior while the swelling of thick-walled bulky latewood cells is generally isotropic. A poromechanical model is developed to explore the anisotropic swelling behavior of softwoods at the cellular scale. The general description for the macroscopically observable free swelling strain of cellular tissues is derived by upscaling the constitutive equations of a double porosity medium which is found to be dependent on stiffness, Biot coefficient, Biot modulus and the geometry of the cells. The effective poroelastic constants of earlywood and latewood cells are computed from a periodic honeycomb unit cell by means of an efficient finite-element-based computational upscaling scheme. The estimated swelling coefficients compare well with experimental measurements. It is found that the anisotropy in swelling behavior of wood cells can be related to the anisotropy of elastic properties at the cell wall level and the geometry of the cells. The proposed poromechanical model provides a physically relevant description of swelling behavior which originates from the coupled interaction of water and solid phases within the porous cell walls of softwoods.
机译:实验研究表明,根据生长环内的颅内细胞的位置,软木在细胞比例下表现出不同的膨胀图案。薄壁早期细胞显示各向异性膨胀行为,而厚壁庞大的胶水细胞的肿胀通常是各向同性的。开发了一种多孔机制,探讨了蜂窝尺度的软木肿胀行为。通过升高发现双孔隙介质的组成方程来导出宏观观察的自由溶胀菌株的一般描述,该双孔隙率介质被发现依赖于刚度,生物系数,Biot模量和细胞的几何形状。通过基于有效的有限元的计算upcoging方案,通过周期性蜂窝单元电池计算早期蜂窝单元的有效孔隙弹性常数。估计的溶胀系数与实验测量相比很好。结果发现,木细胞的肿胀行为中的各向异性可以与细胞壁水平的弹性性质的各向异性和细胞的几何形状有关。所提出的多孔机械模型提供了一种物理相关的膨胀行为描述,该膨胀行为起源于软木的多孔细胞壁内的水和固相的耦合相互作用。

著录项

  • 来源
    《RSC Advances》 |2015年第5期|共7页
  • 作者单位

    McGill Univ Dept Mech Engn Montreal PQ H3A OC3 Canada;

    EMPA Swiss Fed Labs Mat Sci &

    Technol Lab Bldg Sci &

    Technol CH-8600 Dubendorf Switzerland;

    EMPA Swiss Fed Labs Mat Sci &

    Technol Lab Bldg Sci &

    Technol CH-8600 Dubendorf Switzerland;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 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