Numerical Simulation Research Of Ballistic Performance Of Kevlar129/EVA Composites

High performance Kevlar129 /EVA composite is a kind of bulletproof composites widely used in the field of composite armor. It is a bullet proof composite material with the advantages of light weight, high modulus, high strength, good anti-fatigue performance and no two damage effect. Kevlar129 /EVA composites play an important role in the present human body protection and weapons systems armor protection, such as bulletproof vest, helmet, tank, aircraft and ship and so on. Therefore, it is of great significance to study on the ballistic performance of Kevlar129 /EVA composites.The basic theory of fragment penetrating target was firstly introduced in this paper from the three aspects of the determination of penetration type and analysis of penetration process, the basic equation of penetration process and the basic finite element theory,and the penetration resistance of Kevlar129 /EVA composite was studied from the following two aspects based on the finite element simulation.(1) The fragment vertical penetrating into finite thickness Kevlar129 /EVA composites target was simulated by means of the finite element. The studies were focus on the influence of the fragment velocity, fragment shape and target thickness on the ballistic performance. According to the results of numerical simulation, the four penetration stages of fragment penetrating targets were analyzed. The relationship between the ballistic limit and target thickness was obtained as well as the relationship between energy absorption characteristics and target thickness. The relationship between the fragment residual velocity and initial velocity were analyzed as well as the relationship between the fragment penetrating target depth and the initial velocity. A comparative analysis was carried out on different shape and length to diameter ratio of fragment impacting target impacting the targets.(2) The studies focus on the influence of fragment initial velocity, length to diameter ratio and incident angle on the target effective penetration depth and the ballistic depth were conducted by the finite element simulation on fragment oblique penetrating the semi-infinite Kevlar129 /EVA composites. The influence between the target surface crater shape and the incident angle was analyzed as well as the influence between stress distribution and the incident angle, and the influence between ballistic penetration path and the incident angle. All of the studies on the ballistic performance of the finite thickness Kevlar129 /EVA composites target and the semi-infinite Kevlar129 /EVA composites obtained by finite element simulation and analysis are of great significance for the further study of Kevlar fiber reinforced composite materials.