Influence of surface polyurea coating on the ballistic performance of kevlar fabric

With the increasing lethality of modern weapons, the development of body armor has become increasingly important. The main objective of current research is to make protective gear lighter and increase material ballistic performance. Here, a model ballistic-resistant composite material was produced consisting of a polyurea coating on Kevlar plain weave fabric. The effects of coating location and thickness on the ballistic performance of this aramid fabric was examined using yarn pull-out test, ballistic impact test, and numerical simulation. The results demonstrated that the polyurea coating significantly increased the friction between yarns. The maximum yarn pull-out force of the polyurea-coated fiber composite was 40-fold greater than that of the uncoated fiber. Moreover, the application of the coating on the front side outperformed the rear side in terms of ballistic performance. In particular, the front-side 0.2 mm coating was observed to result in the most considerable ballistic limit improvement, increasing the ballistic limit of a single layer of Kevlar fabric from 90.8 to 143.45 m/s. A high precision mesoscale simulation model was developed to analyze the impact of the polyurea coating on the deformation and damage of the Kevlar fabric. These results will contribute to developing new bullet-proof composite materials for the safety protection of personnel.