Deformation modeling of polyvinylidenedifluoride (PVDF) symmetrical microfiltration hollow-fiber (HF) membrane
Deformation modeling of polyvinylidenedifluoride (PVDF) symmetrical microfiltration hollow-fiber (HF) membrane
复制标题
聚偏二氟乙烯（PVDF）对称微滤中空纤维（HF）膜的变形建模
DOI：
10.1016/j.memsci.2015.09.048
复制
发表时间：
2016-01-01
影响因子：
9.5
通讯作者：
Chen, Xi
中科院分区：
文献类型：
--
作者：
Iio, Shouichi;Yonezu, Akio;Chen, Xi
研究了聚偏二氟乙烯（PVDF）对称微滤中空纤维（HF）膜的拉伸变形行为。该膜具有具有三维开孔结构的亚微米孔。通过FESEM（场发射扫描电子显微镜）观察多孔膜的表面和横截面，以研究细胞的微观结构，即其尺寸和韧带几何形状。在单轴拉伸试验中，膜经历弹性变形和塑性变形。大变形引起孔隙沿拉伸方向生长，导致透水率增加。为了建立拉伸变形的力学模型，采用了有限元法（FEM）。在此模型中，使用开尔文多面体（截角八面体结构）来模拟三维开孔结构。创建了基于该结构的单晶胞，并采用周期性边界条件进行有限元计算。有限元模型可以再现多孔膜的整体弹塑性变形行为，并为多孔膜的制造和水净化的可靠运行提供有用的见解。 (C) 2015 Elsevier B.V. 保留所有权利。
The tensile deformation behavior of polyvinylidenedifluoride (PVDF) symmetrical microfiltration hollow-fiber (HF) membranes was studied. The membranes had submicron pores with a three-dimensional open-cell structure. The surface and cross section of the porous membranes were observed by FESEM (field emission scanning electron microscope) to investigate the microstructure of the cell, namely, its size and ligament geometry. During uniaxial tensile tests, the membranes underwent elastic deformation and plastic deformation. Large deformation induced pore growth along the tensile direction, resulting in an increase in water permeability. In order to establish a mechanical model for tensile deformation, the finite element method (FEM) was employed. In this model, the Kelvin polyhedron (truncated octahedron structure) was used to mimic a three-dimensional open-cell structure. A one-unit cell based on this structure was created, and a periodical boundary condition was employed for the FEM computation. The FEM model could reproduce the overall elastoplastic deformation behavior of the porous membrane and provide useful insight into the fabrication of porous membranes and reliable operation of water purification. (C) 2015 Elsevier B.V. All rights reserved.