Study On Failure Process Of Projectile Penetrating Concrete Based On Three Dimensional Numerical Simulation

The behavior of concrete target to projectile impact is described as a complicatedimpact dynamic problem, in which the process of dynamic response and damage-failurebehavior of concrete target are involved. This paper presents a three-dimensionalnumerical simulation of projectile penetrating into concrete target by using the non-linearfinite element software ANSYS/LS-DYNA. By comparing the numerical results withexperimental data, it is verified that the calculation model, mesh, material model andparameters are reliable for simulation. Moreover, perforation of concrete target issimulated under different thickness and different nose profile projectile.For the ogival-nosed projectile penetrating into concrete target, three main stages ofdamage evolution of concrete target were observed and analyzed. According to the stressevolution characteristics, the mechanism of meso-elements failure and their failure modesare analyzed. It is shown that the concrete target elements in front of projectile presentcrushing failure, but the elements at the bottom and the sides of concrete target failured intensile. Moreover, a suddenly zero stress status will appear in an element just before it wascrushed. The crushed concrete elements will dissipate the projectile’s kinetic energy anddecrease projectile’s velocity in penetration. The penetration depth, spallation at the backof the concrete target and punching failure at the both sides of target determine whether aprojectile can pass through a concrete target or not. So, understanding of the crushingfailure and the three stages of concrete target failure are very important for the design ofpractical engineering.Failure mode of flat-faced projectile penetrating into concrete is different fromogival-nose projectile. Numerical simulation results obtained the damageprocess, that isthe conrete damage is found around penetration area zone at initial penetration, with thepenetration depth, the target body near the front of projectile occurs failure and thedamage expands to the middle-lower section, and then propagates and induces the bottomspallation, and finally, the channel between the partical damage zone and the targetplate avalanche destruction zone is formed.