The effect of annular multi-point initiation on the formation and penetration of an explosively formed penetrator

Li, Weibing; Wang, Xiaoming

doi:10.1016/j.ijimpeng.2009.08.008

Cited by 80 publications

(49 citation statements)

References 3 publications

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“…The explosive, liner, and steel target are meshed with Lagrangian algorithm. *CONTACT_SLIDING_ONLY_PENALTY [Hallquist,1997] number of numerical calculation results can prove that detonation products at about 30 µs will no longer affect the characteristic parameters of MEFP after the explosive is detonated; therefore, the explosive was deleted at 30 µs in the numerical calculation [Li et al, 2010].…”

Section: Establishment Of the Simulation Modelmentioning

confidence: 99%

Numerical and Experimental Study on the Formation and Dispersion Patterns of Multiple Explosively Formed Penetrators

Liu

Long

et al. 2017

Lat. Am. j. solids struct.

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Three-dimensional numerical simulations and experiments were performed to examine the formation and spatial dispersion patterns of integral multiple explosively formed penetrators (MEFP) warhead with seven hemispherical liners. Numerical results had successfully described the formation process and distribution pattern of MEFP. A group of penetrators consisting of a central penetrator surrounded by 6 penetrators is formed during the formation process of MEFP and moves in the direction of aiming position. The maximum divergence angle of the surrounding penetrator group was 7.8°, and the damage area could reach 0.16 m 2 at 1.2 m. The laws of perforation dispersion patterns of MEFP were also obtained through a nonlinear fitting of the perforation information on the target at different standoffs. The terminal effects of the MEFP warhead were performed on three #45 steel targets with a dimension of 160cm  160cm  1.5cm at various standoffs (60, 80, and 120 cm). The simulation results were validated through penetration experiments at different standoffs. It has shown excellent agreement between simulation and experiment results.

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Section: Establishment Of the Simulation Modelmentioning

confidence: 99%

Numerical and Experimental Study on the Formation and Dispersion Patterns of Multiple Explosively Formed Penetrators

Liu

Long

et al. 2017

Lat. Am. j. solids struct.

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“…Furthermore, multipoint initiating technology based on the detonation wave collision is a new type of warhead control, which can decrease the reaction time of the charge and increase the energy utilization of the explosive [18]. This method is mainly applied in military fields, such as explosively formed penetrators (EFP) [19], linear EFP [20], and ammunition design [21]. Satisfactory results in engineering blasting are also rarely obtained because delay time of industrial detonators is in the microsecond magnitude; thus, a simultaneous initiation is difficult to guarantee [22].…”

Section: Shock and Vibrationmentioning

confidence: 99%

Experimental Study of Bilinear Initiating System Based on Hard Rock Pile Blasting

Miao

Yan

et al. 2017

Shock and Vibration

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It is difficult to use industrial explosives to excavate hard rock and achieve suitable blasting effect due to the low energy utilization rate resulting in large rocks and short blasting footage. Thus, improving the utilization ratio of the explosive energy is important. In this study, a novel bilinear initiation system based on hard rock blasting was proposed to improve the blasting effects. Furthermore, on the basis of the detonation wave collision theory, frontal collision, oblique reflection, and Mach reflection during detonation wave propagation were studied. The results show that the maximum detonation pressure at the Mach reflection point where the incident angle is 46.9 ∘ is three times larger than the value of the explosive complete detonation. Then, in order to analyze the crack propagation in different initiation forms, a rock fracture test slot was designed, and the results show that bilinear initiating system can change the energy distribution of explosives. Finally, field experiment was implemented at the hard rock pile blasting engineering, and experimental results show that the present system possesses high explosive energy utilization ratio and low rock fragments size. The results of this study can be used to improve the efficiency in hard rock blasting.

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“…Their studies focus on the aspect ratio (length-to-diameter ratio) of the explosive, case and liner. Recently, Li et al [2010] examine the effects of the position, timing and number of detonation points on the EFP formation. They conclude that the velocity and penetration capability of projectile increase when the number of detonation points increases.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response and Microstructure Evolution of Oxygen-Free High-Conductivity Copper Liner in Explosively Formed Projectile

Liu

Long

et al. 2017

Lat. Am. j. solids struct.

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The dynamic response and microstructure evolution of oxygen-free high-conductivity copper in a shaped charge liner are investigated through microstructural examination of a soft-recovery EFP. Adiabatic shear bands and voids which is the failure original of copper EFP can be observed in the rear part of the projectile. Numerical simulation results illustrate that the highest plastic strain reaches about 2.9 which can fully accommodate the grains deformation of copper EFP during the formation process at strain rates of the order of 10 4 s −1 . Theoretical calculation results indicate that the highest temperature increase of EFP caused by shock wave and plastic deformation can reach 747K, which is 0.55Tm (where Tm is the melting temperature of copper). The main body of the EFP undergoes completely dynamic recrystallisation, and the average size of the refined grains significantly decreases to approximately 10µm. A slight increase in grain size occurs mainly away from the center and extends towards the head and rear sections of the EFP. During the DRX process, the dislocation movement is believed to be the controlling mechanism significantly refining the microstructure.

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The effect of annular multi-point initiation on the formation and penetration of an explosively formed penetrator

Cited by 80 publications

References 3 publications

Numerical and Experimental Study on the Formation and Dispersion Patterns of Multiple Explosively Formed Penetrators

Numerical and Experimental Study on the Formation and Dispersion Patterns of Multiple Explosively Formed Penetrators

Experimental Study of Bilinear Initiating System Based on Hard Rock Pile Blasting

Dynamic Response and Microstructure Evolution of Oxygen-Free High-Conductivity Copper Liner in Explosively Formed Projectile

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