The influence of liner material on the dynamic response of the finite steel target subjected to high velocity impact by explosively formed projectile

Liu, Jianfeng; Long, Yuan; Ji, Chong; Zhong, Mingshou; Liu, Qiang

doi:10.1016/j.ijimpeng.2017.07.002

“…In the finite element model as shown in Figure 3, 8701 explosives are selected [19,25], high explosive material model and JWL (Jones Wilkins Lee) state equation are used, material parameters are shown in Table 2, and JWL state equation expression is shown in equation (1).…”

Section: Materials Constitutive Model and Parametersmentioning

confidence: 99%

Numerical Simulation and Experimental Study on Shaped Charge Warhead of Guided Ammunition

Ma

¹

,

He

²

2021

Shock and Vibration

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To study the jet penetration capability of shaped charge warhead of guided ammunition, a variable cone angle-shaped charge liner was designed. LS-DYNA software is used to simulate the penetration capability of shaped charge warhead with three different metal materials (copper, steel, and aluminum). Numerical simulation results show that the velocity of the shaped charge jet formed by the three kinds of materials is v aluminum > v copper > v steel , and the residual velocity after penetration is V steel > V aluminum > V copper , the time when the jet starts to break is tcopper > tsteel > taluminum, and the penetration completion time is Tcopper < Taluminum < Tsteel; therefore, according to the numerical simulation results, copper was selected as the liner material, and the principle prototype is made for the experiment. The results of numerical simulation and experiment show that the shaped charge warhead with copper shaped charge liner has good penetration ability and after-effect damage ability to steel target after penetrating the guidance section, steering gear section, and control section.

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“…In the finite-element model of integral with shell and liner circumferential MEFP warhead as shown in Figure 3, 8701 explosive [19,20] is selected, high explosive material model and JWL (Jones Wilkins Lee) state equation are used, material parameters are shown in Table 2, and JWL state equation expression is shown in Equation (1). General pressure expression of JWL equation of state [18]:…”

Section: Materials Modelmentioning

confidence: 99%

Study of the Forming Characteristics of Small-Caliber Ammunition with Circumferential MEFP

Ma

¹

,

He

²

,

Liu

³

et al. 2020

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To study the influence of the structural parameters of the ammunition liner of small-caliber ammunition on the forming characteristics of the projectile, an integrated circumferential multiple explosively formed projectile (MEFP) warhead with an integrated shell and the liner was initially designed, and the wall thickness of the liner is variable. LS-DYNA finite-element software is used to simulate the integral circumferential MEFP of the preliminary design, based on the numerical simulation results, the influence of the thickness at the center of the liner, and the curvature radius of the liner on the shape and velocity of the formed projectile. The numerical simulation results show that when the thickness of the center of the liner is constant and the curvature radius increases gradually, the velocity of the formed projectile decreases and the length: Diameter ratio of formed projectile decreases gradually. When the curvature radius of the liner remains unchanged, the velocity of the formed projectile decreases with the increase of the thickness of the center of the liner, and the shape of the formed projectile does not change significantly. The results show that when the design of integrating the shell and the liner was adopted for the integral circumferential MEFP warhead, the shape of the formed projectile is greatly affected by the curvature radius of the liner (curvature radius of inner and outer walls of the liner), but less by the thickness of the center of the liner. The velocity of the formed projectile is affected by the curvature radius of the inner and outer walls of the liner and the thickness of the center of the liner. Moreover, the influence of the thickness of the center of the liner on the velocity of the formed projectile is greater than that of the curvature radius of the outer wall of the liner.

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“…The main material parameters of reactive liner, copper, and #45 steel are shown in Table 3. The main charge was the 8701 explosive with a nominal density of 1.71 g/cm 3 and a detonation velocity of 8315 m/s [35], which was modeled using the Jones–Wilkins–Lee (JWL) EOS, as shown in Table 4. The 8701 explosive mainly consisted of RDX, PVAC, DNT, and CS.…”

Section: Penetration Enhancement Mechanismmentioning

confidence: 99%

Application of PTFE/Al Reactive Materials for Double-Layered Liner Shaped Charge

Wang

¹

,

Guo

²

,

Geng

³

et al. 2019

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The penetration enhancement behaviors of a reactive material double-layered liner (RM-DLL) shaped charge against thick steel targets are investigated. The RM-DLL comprises an inner copper liner, coupled with an outer PTFE (polytetrafluoroethylene)/Al reactive material liner, fabricated via a cold pressing/sintering process. This RM-DLL shaped charge presents a novel defeat mechanism that incorporates the penetration capability of a precursor copper jet and the chemical energy release of a follow-thru reactive material penetrator. Experimental results showed that, compared with the single reactive liner shaped charge jet, a deeper penetration depth was produced by the reactive material-copper jet, whereas the penetration performance and reactive material mass entering the penetrated target strongly depended on the reactive liner thickness and standoff. To further illustrate the penetration enhancement mechanism, numerical simulations based on AUTODYN-2D code were conducted. Numerical results indicated that, with increasing reactive liner thickness, the initiation delay time of the reactive materials increased significantly, which caused the penetration depth and the follow-thru reactive material mass to increase for a given standoff. This new RM-DLL shaped charge configuration provides an extremely efficient method to enhance the penetration damage to various potential targets, such as armored fighting vehicles, naval vessels, and concrete targets.

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The influence of liner material on the dynamic response of the finite steel target subjected to high velocity impact by explosively formed projectile

Cited by 47 publications

References 32 publications

Numerical Simulation and Experimental Study on Shaped Charge Warhead of Guided Ammunition

Numerical Simulation and Experimental Study on Shaped Charge Warhead of Guided Ammunition

Study of the Forming Characteristics of Small-Caliber Ammunition with Circumferential MEFP

Application of PTFE/Al Reactive Materials for Double-Layered Liner Shaped Charge

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