Simulation Study on EFP with Stable Tail Fins Formed by Polygonal Shaped Charge Liner

Li, Wenbin; Xiang, Dong; Shen, Xiaojun; Song, Ping; Xu, Wen-Xu

doi:10.12783/ballistics2019/33226

Cited by 4 publications

(5 citation statements)

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“…(11) indicates that there is a positive correlation between the axial speed v a , the step depth h, and the step rotation angle, ε. However, (12) indicates that the EFP axial angular velocity is positively correlated with the number of steps a and the step No rotation angle ε and negatively correlated with the step offset angle Φ and the mass of the liner m. We found the solutions of these equations using the numerical calculation software MATLAB. In addition, we carried out the structural design of the stepped liner based on the above conclusions.…”

Section: Chargementioning

confidence: 99%

“…Li et al [12] investigated the feasibility of polygonal charge shell layers to form EFP with large aspect ratio and found that hexagonal polygonal charges can form EFP structures with better aerodynamic performance. Baburin et al [13] developed a model for forming a tilted-fold tail EFP, studied the influence of the tail on the change in the aerodynamic coefficients for a wide range of head-on angles, and calculated the angular velocity of the axial rotation of the tilted-fold tail EFP based on Newton's method.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation of an Explosively Formed Penetrator Warhead Using a Step-Shaped Charge

Wang

Chen

Yang

et al. 2022

Shock and Vibration

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In this study, the formation mechanism of an explosively formed penetrator (EFP) with tail fins was analyzed. Through static denotation and dynamic flight tests, the feasibility of using a step-shaped liner during the formation of an EFP with tail fins was verified. The influences of the step depth, h, and the step angle, Φ, on the flight stability were then explored. Based on the consistency between the numerical simulation and experimental results, the influences of the step-shaped liner’s spherical arc radius, number of steps, and wall thickness on the formation and flight stability of an EFP with tail fins were further studied. The results showed that a T2 copper step-shaped liner performed better than a H90 brass liner. Compared with a hemispherical liner with an equal wall thickness, the step-shaped liners resulted in EFPs with initial angular velocities and relatively better flight stability. Moreover, a greater initial angular velocity led to a higher EFP landing accuracy.

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Section: Chargementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of an Explosively Formed Penetrator Warhead Using a Step-Shaped Charge

Wang

Chen

Yang

et al. 2022

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…Luo et al (2009) improved the flight performance of tail fin EFP by modifying the liner edge with concave dents and optimizing the warhead structural parameters using numerical simulations. Zhang et al (2004) and Li et al (2019) proposed polygonal liners and used numerical simulations to obtain tail fin EFP with large length-to-diameter ratios. The symmetry of the molded fins plays a crucial role in ensuring the flight stability of the EFP.…”

Section: Introductionmentioning

confidence: 99%

Formation of explosively-formed projectile with tail fins using polygonal charges

Chen,

Li,

et al. 2024

Lat. Am. j. solids struct.

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To further improve the strike accuracy and penetration power of explosively-formed projectile (EFP) after long-distance flight, a polygonal charge capable of forming EFP with tail fins was designed during the study. A model for calculating the EFP velocity was derived from the effective charge and detonation projection theories with the integration of calculus. The circumferential velocity distributions of EFP formed using polygonal charges were obtained using this model, and the mechanisms underlying the formation of tail fins were elucidated. The feasibility of using this polygonal charge to form tail fin EFP was verified by conducting multi-media soft recovery tests and numerical simulations. Furthermore, the feasibility of forming tail fin EFP using polygonal charges with different numbers of sides and the effects of the structural parameters of a hexagonal charge on the formation of tail fin EFP were investigated by simulation. The ranges of optimal values for the structural parameters of a hexagonal charge capable of forming high-performance tail fin EFPs were determined.

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“…Guo et al [22] and Zhu et al [23] discussed the influence of the tantalum liner structure parameters on EFP forming and penetration performance. Li et al [24] analyzed the liner structure parameters to form tantalum tail EFP. In terms of initiation mode, Kumar et al [25] discussed the influence of single-point initiation and circumferential multipoint initiation on the formation of tantalum EFP.…”

Section: Introductionmentioning

confidence: 99%

Research on Numerical Simulation of Tantalum Explosively Formed Projectile Forming Driven by Detonation

Wang

et al. 2022

Shock and Vibration

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In order to study the formation characteristics of tantalum explosively formed projectile (EFP), based on LS-DYNA finite-element software, this article analyzes the influence of mesh size on tantalum EFP forming, compares the accuracy of JC constitutive parameters in different literature on the characterization of tantalum EFP forming, calculates the effective action time of detonation that drives EFP formation, and carries out experimental verification. The results show that the EFP forming velocity was less sensitive to grid size; however, the EFP shape was highly sensitive to grid size, among which the liner had the greatest influence. Besides, for the same density and different constitutive parameters, the velocity of the stabilized EFP was the same, but the change trend of velocity was different, which led to the difference in morphology. The verification test showed that a selection of appropriate JC constitutive parameters could simulate tantalum EFP forming. Finally, the effect of detonation products on EFP forming was reflected mainly in the axial acceleration and radial contraction of the tail skirt. The influence of explosives and detonation products on EFP forming can be ignored 80 μs after the charge detonates. In this work, the numerical simulation method of tantalum EFP forming was studied, which provides guidance for the design and engineering application of tantalum EFP.

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Simulation Study on EFP with Stable Tail Fins Formed by Polygonal Shaped Charge Liner

Cited by 4 publications

References 0 publications

Formation of an Explosively Formed Penetrator Warhead Using a Step-Shaped Charge

Formation of an Explosively Formed Penetrator Warhead Using a Step-Shaped Charge

Formation of explosively-formed projectile with tail fins using polygonal charges

Research on Numerical Simulation of Tantalum Explosively Formed Projectile Forming Driven by Detonation

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