Fragment Velocity Characteristics of Warheads with a Hollow Core under Asymmetrical Initiation

An, Xuanyi; Dong, Yongxiang; Liu, Jiayun

doi:10.1002/prep.201800382

Cited by 8 publications

(5 citation statements)

References 16 publications

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“…The velocity enhancement mechanism of an asymmetrically two lines warhead was due to the detonation distance and the pressure increase in the Mach wave. An et al [29] investigated the fragment acceleration of amiable warheads due to the collision of the detonation wave. They adopted the increase in hollow-core diameter to enhance the efficiency of detonation wave collision in a large-shaped charge.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic fracture of metal rods under overdriven effect of cylindrical detonation collision

Li,

Liang,

Tian

2023

Propellants Explo Pyrotec

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The collision of detonation waves is widely used in weapon design due to its ability to efficiently achieve an ultra‐high pressure region. This work discusses the dynamic fracture of metal rods under the collision of cylindrical detonations. In the experiments, the detonation wave collision is generated by detonating an explosive charge at its end position along two parallel initiation lines, which are detonated by a plane wave generator. The recovered metal rods were broken around their centers due to the superposition of detonation waves. A blue oxidation zone appeared at the fracture surfaces of steel rods in the contact zone under the charge, indicating the local existence of high temperatures. A finite element model was used to simulate and describe the dynamic fracture of metal rods caused by detonation wave collision. The three‐shock theory was used to examine the detonation wave collision. When the incidence angle was between 0° and 40°, the reflected shock wave pressure was approximately 2.1 times the CJ pressure. At an incidence angle of 44.84°, the ratio of Mach and CJ pressure reached a maximum of 3.1. The concentration degree of detonation pressure was developed to evaluate the superposition influence on the dynamic fracture of metal rods. The microstructure of fracture surfaces revealed that metal rods preferred shear fracture under high pressure concentration. With a low degree of pressure concentration, a brittle fracture may emerge. This research serves as a guide for designing and evaluating multimode warheads.

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Section: Introductionmentioning

confidence: 99%

“…Many researchers have studied the irregular or Mach reflection of detonation waves, and most of their works focused on their application in fragment driving and explosively formed projectile (EFP) formation [28,29,31]. The effect of detonation wave collisions on metal rods has received minimal attention.…”

Section: Introductionmentioning

confidence: 99%

Dynamic fracture of metal rods under overdriven effect of cylindrical detonation collision

Li,

Liang,

Tian

2023

Propellants Explo Pyrotec

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“…Results confirm that the formula developed with a numerical model could accurately predict fragment speed dispersion along the axis and circumference of the cylindrical skin under an eccentric start point at one end, thereby simulating the edge effect. Further, Studies reported calculating the fragment velocity of hollow-core warheads with asymmetric detonation [31][32][33][34] . Recently, Jifeng Wei et.al 35 studied the fragmentation of a thinwalled Q235 steel shell under an explosion of TNT.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Initial and Striking Velocity of Primary Fragments from Cased Spherical Explosive inside Steel Cubical Structure

Joshi

Panigrahi²

2022

Def. Sc. J.

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Usually, energy generated from an explosive’s detonation is transferred partly in the form of the blast impulse and some in the form of the kinetic energy of casing fragments. When detonation occurs in an explosive casing, it breaks the casing into fragments of different weights with varying velocities. The extent of destruction by these energized fragments depends upon the initial velocity they gain after an explosion. The momentum gained by the fragments decides the capability to perforate a barrier or propagate an explosion. A three-dimensional non-linear FEA method is used to model a box-shaped steel structure. This box-shaped structure is subjected to an internal cased explosion for estimating the initial and striking velocities of primary fragments. The effect of varying charge weight and the effect of the sacrificial wall on the initial and striking velocity of fragments via numerical simulations are also carried out. The initial and striking velocity values obtained through simulation are compared with the design guidelines of the code-based approach, and a good agreement is reported.

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“…An et al [5] and Felix et al [6] studied fragment axialspeed distribution characteristics for various explosions. König [7] and Huang et al [8] studied a formula for the fragment dispersion angle of cylindrical warheads with end effects by experimental testing and numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Multiprojectile Attack and Killing Effects of Detonation Warheads

Ning

Yao

et al. 2022

Shock and Vibration

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Dynamic spatial distribution and killing characteristics of warhead fragments are important topics in the field of weapon effectiveness and protection. However, there is little research on the fragment distribution formed by continuous dynamic attacks of multiple projectiles that explode above the ground. This study analyzes spatial distributions of warhead fragments using witness boards in a rectangular target test. The results show that the fragment distribution of multiple projectiles in continuous dynamic attacks demonstrates a spatial superposition characteristic. The superimposed distribution is the sum of the distributions of two independent fragment distributions. The distribution characteristics are consistent with fragment scattering behavior. Therefore, they can be used to analyze the killing effects of multiple projectiles conveniently. The effects of falling speed, falling angle, and explosion height on the damage range of fragments were explored by a fragment spatial distribution model obtained from experiments. Analysis indicates that the prefabricated fragment distribution conformed to a spatial superposition relationship under dynamic multiprojectile continuous attacks, and the superposition obeyed fragment scattering characteristics. As the projectile falling angle increased at the explosion center, or as the falling height decreased, the positive pressure duration increased gradually. The falling speed had the greatest impact on the specific impulse of overpressure. The falling angle had the greatest impact on the peak value of overpressure. Both the falling angle and the explosion height had the greatest impact on the positive pressure acting time.

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Fragment Velocity Characteristics of Warheads with a Hollow Core under Asymmetrical Initiation

Cited by 8 publications

References 16 publications

Dynamic fracture of metal rods under overdriven effect of cylindrical detonation collision

Dynamic fracture of metal rods under overdriven effect of cylindrical detonation collision

Prediction of Initial and Striking Velocity of Primary Fragments from Cased Spherical Explosive inside Steel Cubical Structure

Dynamic Multiprojectile Attack and Killing Effects of Detonation Warheads

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