Virtual Description of a Biaxial 0°/90° Non-Crimp Fabric with Normally Distributed Filament Directions

摘要

This study aims at predicting the mechanical behavior of a 0°/90~° biaxial tricot-chain NCF using digital chain elements. In order to reproduce the entanglements of the filaments and their deviation from the ideal 0°/90~° paths, the orientation of the digital chains is sampled with a normal distribution. This enables an accurate reproduction of the geometrical deviations observed on the material. Moreover, averaged periodic boundary conditions have been developed to apply an overall mesoscopic periodic deformation to a model that doesn't exhibit any periodicity at the scale of the digital chains. These models have subsequently been used for virtual characterization of the compaction behavior and were compared to experimental results. It is shown that the resulting thickness and compaction stiffness are very sensitive with respect to the distribution used to sample the chain's directions. Moreover, the smallest representative volume element (RVE) compliant with the mesoscopic periodicity is already able to capture the defects and the compaction behavior with reduced computation time.