Ballistic Resistance Modeling of Aramid Fabric with Surface Treatment.

The minimization of mass and reducing the value of deflection of the back surface of an armored panel, which will lower the level of trauma to the human body, are crucial tasks in the current development of body armors. A significant part of the bullet energy is dissipated due to the friction of pulling-out yarns from ballistic fabrics in the body armor. We present a method for controlling the process of dry friction between yarns – surface treatment with various compositions (PVA suspension, rosin). This procedure causes only a slight increase weighting of the fabric. We investigated an impact loading of aramid fabrics of plain weave P110 with different types of surface treatment and without it (the samples were located on the backing material – technical plasticine). The indenter speed was in the range of 100–130 m/s. We also developed a model of an impact loading of considered samples in explicit FE code LS-DYNA. The surface treatment of the fabric in the model was taken into account by only one parameter – the coefficient of dry friction. We considered several methods of the task parallelizing. Numerical experiments were conducted to study the problem scalability. We found that the surface treatment reduces deflection of fabric up to 37% with an increase in weight up to 5.1%. The numerical values of the depths of the dents in the technical plasticine are in good agreement with the experimental data.