Elastoplastic finite-element analysis of heat-sealed area in laminated plastic film used for liquid packaging bags under different temperatures

摘要

In this study, stress and strain on a cross section of a heat-sealed area in laminated plastic film used for liquid packaging bags under different temperatures were analyzed using the elastoplastic finite-element method upon application of static load to dynamically investigate the cause of bursting of the bags. Prior to the analysis, Young's moduli, Poisson's ratios and stress-strain curves of the components constituting the film, which were necessary in the analysis, were measured using a grid method. In addition, the force acting on an area was determined by measuring the pressure in the bags. The shapes of cross sections obtained by the analysis of their material properties and the force were in good characteristic distributions of equivalent stress and strain, which depend on temperature, were found in the area.