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Formation and impact-induced separation of tandem EFPs

Defence Technology（防务技术） 2020年第3期16卷 668-677页

作者： Hong-bing Ma Yuan-feng Zheng hai-fu wang Chao Ge Cheng-hai Su State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

The formation and separation behaviors of tandem EFPs are studied by the combination of experiments and *** results show that different formation and separation processes can be obtained by adjusting the double-layer liners,and simulations agree with experiments ***,the interaction process between the two liners is discussed in details,and the formation and separation mechanism are *** can be found that there are four phases in the formation and separation processes,including impact phase,propulsion phase,slide phase and free flight *** the impact phase,the velocities of two liners rise in turns with kinetic energy *** the propulsion phase,the axial impact becomes insignificant,but the radial interaction between two liners influences the appearance of tandem ***,it should be mentioned that the inner surface of foregoing EFP remains to be in contact with the outer surface of following EFP in the propulsion phase,and the following one would continue to push the foregoing one for about 10μ to 20 μs,causing the velocities of following and foregoing EFPs gradually decreasing and increasing *** the slide phase,an obvious relative movement occurs between the two EFPs,and there would be barely kinetic energy ***,the two EFPs separate gradually and get into the phase of free ***,if the outer and inner liners have the same thickness,the outer copper-inner copper liners form two long EFPs,the outer copper-inner steel liners become a foregoing short steel EFP and a following long copper EFP,and the outer steel-inner copper liners produce a foregoing long copper EFP and a following conical steel *** addition,thickness match also has an important impact on formation appearance and separation process for both outer copperinner copper liners and outer steel-inner copper *** the thickness ratio of outer liner to inner liner decreasing,the length and length-diameter ratio of both foreg

关键词： Shaped charge Liner Tandem EFPs Formation Separation

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Chain damage effects of multi-spaced plates by reactive jet impact

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Defence Technology（防务技术） 2021年第2期17卷 393-404页

作者： Yuan-feng Zheng Cheng-hai Su Huan-guo Guo Qing-bo Yu hai-fu wang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

Chain damage is a new phenomenon that occurs when a reactive jet impacts and penetrates multispaced *** reactive jet produces mechanical perforations on the spaced plates by its kinetic energy(KE),and then results in unusual chain rupturing effects and excessive structural damage on the spaced plates by its deflagration *** the present study,the chain damage behavior is initially demonstrated by *** reactive liners,composed of 26 wt%Al and 74 wt%PTFE,are fabricated through a pressing and sintering *** reactive liner thicknesses of 0.08 CD,0.10 CD and 0.12 CD(charge diameter)are chosen to carry out the chain damage *** results show a chain rupturing phenomenon caused by reactive *** constant reaction delay time and the different penetration velocities of reactive jets from liners with different thicknesses result in the variation of the deflagration position,which consequently determines the number of ruptured plates behind the ***,the finite-element code AUTODYN-3D has been used to simulate the kinetic energy only-induced rupturing effects on plates,based on the mechanism of behind armor debris(BAD).The significant discrepancies between simulations and experiments indicate that one enhanced damage mechanism,the behind armor blast(BAB),has acted on the ruptured ***,a theoretical model is used to consider the BAB-induced enhancement,and the analysis shows that the rupturing area on aluminum plates depends strongly upon the KE only-induced pre-perforations,the mass of reactive materials,and the thickness of plates.

关键词： Reactive materials Reactive jet Chain damage Behind armor blast

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Damage behavior of the KKV direct hit against fluid-filled submunition payload

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Defence Technology（防务技术） 2022年第11期18卷 2052-2064页

作者： Yang Zan hai-fu wang Yuan-feng Zheng Huan-guo Guo State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

The damage effects of fluid-filled submunition payload impacted by the kinetic kill vehicle(KKV)are investigated by simulations and ground-based *** simulations showed that the damage level and number of submunitions were significantly influenced by the diameter of the KKV compared with its *** on that,a high velocity penetrator formed by shaped charge explosion was used to simulate the direct hit experiment of a KKV impacting submunition *** results demonstrated that the damage modes of submunitions mainly included the slight damage,perforation and total smash,showing a good agreement with the *** understand the multiple damage modes of submunitions,the damage behavior of the submunitions in direct hit process were analyzed based on the AUTODYN-3D *** results presented that increased KKV diameter can increase the crater diameter and expand the damage volume,which will achieve a higher direct hit *** analysis indicated that there were other mechanical behaviors can enhance the damage to submunitions not lying in the KKV flight path,such as secondary debris kill,neighboring submunitions collision with each other,and high-speed fluid injection effect.

关键词： Kinetic kill vehicle Tactical ballistic missiles Submunition payload Direct hit Damage behavior

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Penetration and internal blast behavior of reactive liner enhanced shaped charge against concrete space

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Defence Technology（防务技术） 2022年第6期18卷 952-962页

作者： Hao Zhang Yuan-feng Zheng Qing-bo Yu Chao Ge Cheng-hai Su hai-fu wang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081PR China

Penetration and internal blast behavior of reactive liner enhanced shaped charge against concrete space were investigated through experiments and *** volume of the enclosed concrete space is about 15 m^(3).The reactive liner enhanced shaped charge utilizes reactive copper double-layered liner,which is composed of an inner copper liner and an outer reactive liner,while the reactive material liner is fabricated by PTFE/Al(Polytetrafluoroethylene/Aluminum)powders through cold-pressing and *** explosion experiments show that,compared with the shaped charge which utilizes copper liner,the penetration cavity diameter and spalling area of concrete by the novel shaped charge were enlarged to 2 times and 4 times,***,the following reactive material had blast effect and produced significant overpressure inside the concrete closed *** analysis indicates concrete strength and detonation pressure of reactive material both affect the penetration cavity *** the blast behavior of reactive material inside the concrete space,developing TNT equivalence model and simulated on AUTODYN-3 D for *** results reproduced propagation process of the shock wave in concrete space,and revealed multi-peaks phenomenon of overpressure-time ***,the empirical relationship between the peak overpressure and relative distance for the shock wave of reactive material was proposed.

关键词： Shaped charge Penetration Blast Concrete Numerical simulation

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Fragmentation behavior of large-caliber PELE impacting RHA plate at low velocity

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Defence Technology（防务技术） 2019年第6期15卷 912-922页

作者： Mo-ang Lei hai-fu wang Qing-bo Yu Yuan-feng Zheng State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

Impact experiments of large-caliber PELE with various inner-outer diameter ratio perforating RHA plate at low velocity were *** results showed the size of perforated holes on plate,average diameter of damage area on witness plate,and number of behind-armor fragments will increase as d/D increasing from 0.72 to *** and fragmentation of large-caliber PELE in this condition were also numerically studied with ANSYS ***,an analytical model accounting for an additional radial shock wave was presented to predict radial expansion velocity and fragmentation of jacket,as well as an empirical approach to estimate diameter of damage *** results by these approaches were in good agreement with experiments and numerical *** discussion revealed that Shock/rarefaction wave interactions behavior varying with inner-outer diameter ratio is an important mechanism resulting in different lateral effect by PELE projectiles with various configurations.

关键词： PELE Enhanced lateral effect Penetration mechanics Behind-armor fragments

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Force chains based mesoscale simulation on the dynamic response of Al-PTFE granular composites

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Defence Technology（防务技术） 2021年第1期17卷 56-63页

作者： Le Tang Chao Ge Huan-guo Guo Qing-bo Yu hai-fu wang Beijing Institute of Technology China

Force chains based mesoscale simulation is conducted to investigate the response behavior of aluminumpolytetrafluoroethylene(Al-PTFE)granular composites under a low-velocity impact.A two-dimensional model followed the randomly normal distribution of real Al particles size is *** dynamic compressive process of Al-PTFE composites with varied Al mass fraction is simulated and validated against the *** results indicate that,force chains behavior governed by the number and the size of agglomerated Al particles,significantly affects the impact response of the *** failure mode of the material evolves from shear failure of matrix to debonding failure of particles with increasing density.A high crack area of the material is critical mechanism to arouse the initiation *** damage maintained by force chains during large plastic strain builds up more local stresses concentration to enhance a possible reaction *** addition,simulation is performed with identical mass fraction but various Al size distribution to explore the effects of size centralization and dispersion on the mechanical properties of *** is found that smaller sized Al particle of composites are more preferred than its bulky material in ultimate *** dispersed degree is facilitated to create stable force chains in samples with comparable particle *** simulation studies provide further insights into the plastic deformation,failure mechanism,and possible energy release capacity for Al-PTFE composites,which is helpful for further design and application of reactive materials.

关键词： Al-PTFE Granular composites Mesoscale simulation Dynamic response Force chains

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Enhanced ignition behavior of reactive material projectiles impacting fuel-filled tank

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Defence Technology（防务技术） 2019年第4期15卷 533-540页

作者： Shu-bo Liu Ying Yuan Yuan-feng Zheng Chao Ge hai-fu wang State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

Reactive material projectiles can be an extremely efficient lethality enhancement technology that incorporates the defeat mechanisms of chemical energy and kinetic *** paper presents such a research on the enhanced ignition behavior of reactive material projectiles impacting a fuel-filled ***,the ignition process description of the fuel-filled tank impacted by inert metal and reactive material projectiles is ***,ballistic impact experiments are performed to investigate the ignition effects of the fuel-filled tank impacted by reactive material versus tungsten alloy projectiles with mass *** fuel tank used for the experiments is a cylindrical steel casing structure filled with aviation kerosene and sealed with aluminum cover plates on both ends using screw *** experimental results indicate that,compared with impacts from tungsten alloy projectiles,there is dramatically enhanced structural damage to the fuel-filled tank and an enhanced ignition effect caused by reactive material projectile ***,an analytical model is developed,by which the effects of the aluminum cover plate thickness on critical structural failure energy of the fuel-filled tank and the total energy of the reactive material projectile deposited into the fuel-filled tank are *** analysis shows a good agreement with the experiments.

关键词： Reactive materials fuel-filled tank Chemical energy release Ignition mechanism

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Experimental investigation on enhanced damage to fuel tanks by reactive projectiles impact

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Defence Technology（防务技术） 2021年第2期17卷 599-608页

作者： hai-fu wang Jian-wen Xie Chao Ge Huan-guo Guo Yuan-feng Zheng State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

Enhanced damage to the full-filled fuel tank,impacted by the cold pressed and sintered PTFE/Al/W reactive material projectile(RMP)with a density of 7.8 g/cm3,is investigated experimentally and *** fuel tank is a rectangular structure,welded by six pieces of 2024 aluminum plate with a thickness of 6 mm,and filled with RP-3 aviation *** results show that the kerosene is ignited by the RMP impact at a velocity above 1062 m/s,and a novel interior ignition phenomenon which is closely related to the rupture effect of the fuel tank is ***,the traditional steel projectile with the same mass and dimension requires a velocity up to 1649 m/s to ignite the *** on the experimental results,the radial pressure field is considered to be the main reason for the shear failure of *** mechanism considerations,the chemical energy released by the RMP enhances the hydrodynamic ram(HRAM)effect and provides additional ignition sources inside the fuel tank,thereby enhancing both rupture and ignition ***,to further understand the enhanced ignition effect of RMP,the reactive debris temperature inside the kerosene is analyzed *** initiated reactive debris with high temperature provides effective interior ignition sources to ignite the kerosene,resulting in the enhanced ignition of the kerosene.

关键词： Reactive material projectile fuel tank Enhanced damage effect Enhanced ignition mechanism Impact behavior

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Behind-plate overpressure effect of steel-encased reactive material projectile impacting thin aluminum plate

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Defence Technology（防务技术） 2022年第5期18卷 723-734页

作者： Qing-bo Yu Jia-hao Zhang Hong-wei Zhao Yan-wen Xiao hai-fu wang Beijing Institute of Technology State Key Laboratory of Explosion Science and TechnologyBeijing100081China Academy of the Rocket Force Beijing100094China Equipment Project Management Center Army Equipment DepartmentBeijing100072China

Ballistic impact and sealed chamber tests were performed on the steel-encased reactive material projectile(SERMP)to understand its behind-plate overpressure effect when impacting the thin aluminum *** reactive material encased with a 1.5 mm thick 30CrMnSiNi2A steel shell was launched onto the initially sealed test chamber with a 3 mm thick 2024-T3 thin aluminum cover ***,the overpressure signals in the test chamber were recorded by pressure *** experimental results indicate an unusual behind-plate overpressure effect:as the density of the projectile increases from 6.43 g/cm^(3) to 7.58 g/cm^(3) by increasing the content of tungsten powder,although its total chemical energy decreases,it produces a higher behind-target overpressure at a lower impact velocity.A theoretical model is proposed to predict the reaction length of reactive material inside the projectile based on one-dimensional shock wave theory to understand this unexpected *** addition,the deviation between the actual energy release and the theoretical calculation results,also the variation of overpressure rise time are analyzed and *** the analyses show,when the SERMP successfully penetrates the cover plate,an increasing density of the reactive material inside the projectile always means that the delaying rarefaction wave effect,an increase of its internal pressure and strain rate *** factors lead to the increase of the overpressure limit velocity and reaction extent of the reactive material,while the overpressure rise time decreases.

关键词： Reactive materials Steel-encased reactive material projectile Over-pressure effect Overpressure limit velocity Energy release

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Mesoscale study on explosion-induced formation and thermochemical response of PTFE/Al granular jet

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Defence Technology（防务技术） 2023年第5期23卷 112-125页

作者： Yuan-feng Zheng Zhi-jian Zheng Guan-cheng Lu hai-fu wang Huan-guo Guo State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

The dynamic formation,shock-induced inhomogeneous temperature rise and corresponding chemical reaction behaviors of PTFE/Al reactive liner shaped charge jet(RLSCJ)are investigated by the combination of mesoscale simulation,reaction kinetics and chemical energy release test.A two-dimensional granular model is developed with the randomly normal distribution of aluminum particle sizes and the particle delivery ***,the granular model is employed to study the shock-induced thermal behavior during the formation and extension processes of RLSCJ,as well as the temperature history curves of aluminum *** simulation results visualize the motion and temperature responses of the RLSCJ at the grain level,and further indicate that the aluminum particles are more likely to gather in the last two-thirds of the jet along its *** analysis shows that the shock,collision,friction and deformation behaviors are all responsible for the steep temperature rise of the reactive *** addition,a shock-induced chemical reaction extent model of RLSCJ is built based on the combination of the Arrhenius model and the Avrami-Erofeev kinetic model,by which the chemical reaction growth behavior during the formation and extension stages is described *** model indicates the reaction extent highly corresponds to the aluminum particle temperature history at the formation and extension *** last,a manometry chamber and the corresponding energy release model are used together to study the macroscopic chemical energy release characteristics of RLSCJ,by which the reaction extent model is verified.

关键词： Reactive materials Shaped charge Mesoscale simulation Formation Thermochemical response

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