Simulation of Fragmentation Characteristics of Projectile Jacket Made of Tungsten Alloy after Penetrating Metal Target Plate using SPH Method

Abstract

A smooth particle hydrodynamics (SPH) model was used to simulate the fragmentation process of the jacket during penetrator with lateral efficiency (PELE) penetrating the metal target plate to study the fragmentation characteristics of PELE jacket made of tungsten alloy. The validity of the SPH model was verified by experimental results. Then the SPH model was used to simulate the jacket fragmentation under different impact velocity and thickness of target plate. The influence of impact velocity and thickness of target plate on the jacket fragmentation was obtained by analysing the mass distribution and quantity distribution of the fragments formed by the jacket. The results show that the dynamic fragmentation of tungsten alloy can be simulated effectively using the SPH model, Johnson-Cook strength model, maximum tensile stress failure criterion and stochastic failure model. When the thickness of target plate is fixed, the greater the impact velocity, the greater the pressure produced by the projectile impacting the target plate; with the increase of impact velocity, the mass of residual projectile decreases, the number of fragments formed by fragmentation of jacket increases linearly, and the average mass of fragments decreases exponentially. When the impact velocity is constant, the greater the thickness of the target plate, the longer the pressure duration by the projectile impacting the target plate; with the increase of the thickness of target plate, the mass of residual projectile decreases, the number of fragments formed by fragmentation of jacket increases linearly, and the average mass of fragments decreases exponentially. The numerical calculation model and research method adopted in this paper can be used to study the impact fragmentation of solid materials effectively.

Fragmentation Characteristics and Damage Capacity of Radial Layered PELE

“…Stochastic failure model based on Mott's theory (Mott, 1947) was introduced to the failure criterion of tensile principal stress in numerical simulation. The experimental results show that the numerical model can effectively simulate the fragmentation of PELE (Cheng et al, 2019). In order to study the influence of impact velocity and target material on radial layered PELE, 2A12 aluminum alloy and Q235 steel were selected as the main target materials.…”

Perforation Characteristics of Metal Target plate subjected to PELE

“…The materials of target plate are 45 # steel and 2A12 aluminium alloy. The main material properties of tungsten alloy, nylon, 45 # steel and 2A12 aluminium alloy are shown in Table 1 (Cheng et al, 2019;Tang et al, 2006).…”

“…PELE is a new type of projectile which composed of high density cylindrical jacket and low density filling inside (Jimmy, 2015;Paulus and Schirm, 2006). After penetrated the target plate, the radial binding of the target plate to the jacket disappears, and the damaged jacket breaks up and the fragments disperse further under the radial force produced by the expansion of the filling (Cheng et al, 2019). Many scholars have studied the influence of material and structure of projectile on the fragments s produced by PELE, as well as the velocity and statistical rule of fragments (Zhu et al, 2009(Zhu et al, , 2010Fan et al, 2017;Ding et al, 2018), but one one has studied the damage mode of this kind of projectile to metal target plate.…”