抄録
The tensile deformation behavior of polyvinylidenedifluoride (PVDF) hollow fiber membranes used for water purification was studied. The present PVDF membrane has sub-micron pores with open cell structure. The surface and cross section of the membranes were observed by FESEM to investigate the microstructure (cell size and geometry of the cell ligament). During uni-axial tensile test, the membranes underwent elastic deformation and plastic deformation. In order to establish the mechanical model for such a tensile deformation, finite element model (FEM) was carried out. In this model, Kelvin polyhedron (truncated octahedron) was employed to create 3D open cell structure. Such one-unit cell approach can predict elastoplastic deformation and then it is concluded that we establish a fundamental FEM model to describe the deformation behavior of porous structure. The present model enables the prediction of the macroscopic deformation behavior of the membrane, by taking into account of pore structure. The insight may be useful for porous membrane fabrication and for reliable operation of water purification.
