Smoothed particle hydrodynamics modeling of linear shaped charge with jet formation and penetration effects

Abstract

a b s t r a c tShaped charge, as a frequently used form of explosive charge for military and industrial applications, can produce powerful metal jet and lead to stronger penetration effects onto targets than normal charges. After the explosion of high explosive (HE) charge, the detonation produced explosive gas can exert tremendous pressure on surrounding metal case and liner with very large deformation and even quick phase-transition. In this paper, the entire process of HE detonation and explosion, explosion-driven metal deformation and jet formation as well as the penetrating effects is modeled using a smoothed particle hydrodynamics (SPH) method. SPH is a Lagrangian, meshfree particle method, and has been widely applied to different areas in engineering and science. A modified scheme for approximating kernel gradient (kernel gradient correction, or KGC) has been used in the SPH simulation to achieve better accuracy and stability. The modified SPH method is first validated with the simulation of a benchmark problem of a TNT slab detonation, which shows accurate pressure profiles. It is then applied to simulating two different computational models of shaped-charge jet with or without charge cases. It is found that for these two models there is no significant discrepancy for the length and velocity of the jet, while the shapes of the jet tip are different. The modified SPH method is also used to investigate the penetrating effects on a steel target plate induced by a linear shaped charge jet. The effectiveness of the SPH model is demonstrated by the good agreement of the computational results with experimental observations and the good energy conservation during the entire process.

SPH-FEM simulation of shaped-charge jet penetration into double hull: A comparison study for steel and SPS

“…Baêta-Neves and Ferreira [9] successfully applied a two-dimensional SPH formulation using cylindrical coordinates to simulate a jetformation process for a cylindrical-shaped charge (CSC). All these studies indicate that the SPH method [7][8][9][10][11][12] has natural advantages in simulating the process of a metal-jet formation. Hence, it is utilized here to develop a model of a shaped charge.…”

“…However, computational difficulties can be caused by element distortion when traditional mesh-based methods are used to deal with nonlinear problems of high-speed impact. A meshless smoothed particle hydrodynamics (SPH) method [4][5][6][7][8][9][10] can overcome limitations related to the distorted mesh caused by large deformation. Feng et al [7] applied the SPH method to study explosion-driven metal deformation and jet formation as well as penetrating effects.…”

“…A meshless smoothed particle hydrodynamics (SPH) method [4][5][6][7][8][9][10] can overcome limitations related to the distorted mesh caused by large deformation. Feng et al [7] applied the SPH method to study explosion-driven metal deformation and jet formation as well as penetrating effects. Liu et al [8] established a SPH model of a shaped charge with a hollow cavity and analysed pressure and density distributions in a detonation process.…”

“…Shaped charges have received considerable international attention in recent years and are effectively used in military and civilian fields [1][2][3][4][5][6][7][8][9][10][11][12]. Molinari [1] used a finite-element Lagrangian code to simulate a process from jet formation to its penetration of a plate.…”

Application of Smoothed Particle Hydrodynamics in analysis of shaped-charge jet penetration caused by underwater explosion

“…A strong discontinuous shock wave (Ming et al, 2016;Zhang et al, 2011;Kim and Shin, 2008;Narasimhan, 2001, 2006;Ghoshal and Mitra, 2016;Hung et al, 2005Hung et al, , 2009Zhang et al, 2015a;Zhang and Liu, 2015) and a high-speed metal jet (Arnold and Rottenkolber, 2013;Feng et al, 2013;Molinari, 2002;Chen and Liu, 2012;Yang et al, 2016;Baêta-Neves and Ferreira, 2015;Miyoshi, 2008) can be generated by a shaped charge associated with underwater explosion, which can cause damage in structures. In researches of a shock wave caused by underwater explosion, Zhang et al (Ming et al, 2016;Zhang et al, 2011).…”