The Experimental And Theoretical Study On Hyperelasticity Of Plastic Micro-capillary Films

Plastic micro-capillary films (MCF) is a new kind of plastic extrusion products. Combined with the plastic film, hollow fiber, foam plastics processing technology, we can manufacture the plastic films with the micron-size channels or catheters. The advantages of MCF exist in low investment, low cost and high value-added, etc. Due to its special characteristics in structure and performance, MCF has the extensively potential applications in biomedicine, energy engineering, aerospace, environmental monitoring, ocean engineering, pharmaceutics, automation, and high-end packaging, etc.This thesis studies the influence of the stretching speed, hole size, membrane thickness and material properties on the mechanical behaviors of plastic micro-capillary films (MCFs) under uniaxial tensile experiments. The reliable and truthful data are obtained which can be used in theoretical analysis of MCFs.Based on the uniaxial tensile test data, the proper strain energy density function is selected and the constitutive model is established for MCFs. An analytical solution is obtained for the hyperelastic cylindrical tube when subjected to the internal pressure. The effect of axial pre-stretch and inner-to-outer radius ratio on deformation of the hyperelastic cylindrical tube is investigated.With the aid of the finite element software ABAQUS, large deformation analysis of the MCFs with the multiple channels when subjected to internal pressures is performed. The influence of the number of the channels on the deformation characteristics of MCFs, such as the configuration and the cross sectional aera of the channels, under different internal pressures is analyzed.