Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 25, 2025 - November 29, 2025
The puncture resistance of Polyethylene (PE)-based mono-material films play a significant role in flexible packaging product’s performance. Due to its inherent thinness, obtaining the fracture properties directly through laboratory experiments is difficult. Therefore, in this paper, numerical analysis was employed to reproduce the force and displacement results from static puncture test. First, the analysis was conducted for single layer stretched PE films. Results were found in an excellent agreement when the Hosford-based orthotropic plasticity model was applied, in contrast to the conventional isotropic hardening model. This improved material model was then applied into multilayer film, which consists of LLDPE, HDPE, and stretched PE. Experimental results show good agreement when the previously reproduced single-layer stretched-PE simulation results were extracted and incorporated as biaxial stress and strain properties into the multilayer model. For failure prediction, layer-by-layer failure analysis was conducted. Through employing parametric optimization against maximum plastic strain failure criteria for stretched PE and HDPE, the experimental result can be reproduced up until the maximum load. This work brings out a novel approach of applying the orthotropic plasticity model and layer-by-layer failure modeling to obtain the biaxial failure strain of multilayer PE films, which is valuable for the development process of mono-material packaging.
