Axial distribution characteristics of fragments of the warhead with a hollow core

An, Xuanyi; Liu, Jiayun; Tian, Chao; Feng, Shunshan; Dong, Yongxiang

doi:10.1016/j.ijimpeng.2018.08.003

Cited by 16 publications

(6 citation statements)

References 13 publications

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“…It can be clearly seen that the symmetrical initiation makes the cylindrical casing under axially symmetrical loading, resulting in uniform fragment velocity around the circumference of the warhead. It was found that for the warheads with hollow core under symmetrical initiation, the fragment velocity decreased dramatically when the cylindrical hollow core became larger ( Figure 6), which was consistent with our previous findings [15,16]. When the shock wave of the explosive arrived at the test point, the velocity of the point increased dramatically and then the detonation products accelerated the casing to expand gradually.…”

Section: Numerical Simulation Methodssupporting

confidence: 89%

“…(4)) in our previous work to calculate the maximum fragment velocity of novel warheads filled with hollow-charge by numerical simulation and theoretical analysis, which was then verified with experimental data [15]. We also studied the axial distribution characteristics of fragments produced from novel warheads packed with a hollow charge by the processing of witness plates and a flash-radiography method, and found that novel warheads packed with hollow-charge exhibit different fragmentation characteristics under detonation with a plane wave generator at one end [16].…”

Section: Introductionsupporting

confidence: 53%

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

Dong

Liu

2019

Propellants Explo Pyrotec

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Fragment velocity characteristics of warheads are key issues in the field of explosion technology and protection. However, the fragment velocity characteristics of a warhead with a hollow core under asymmetrical initiation are rarely touched. In this work, the effects of the diameter of the hollow core on the fragment velocities of warheads under asymmetrical initiation were investigated by experimentally verified numerical simulations. The results showed that the fragment velocity‐time curves exhibited a second time acceleration due to the collision of the shock/detonation wave and/or that of the detonation products. For warheads under symmetrical initiation, the second time acceleration becomes stronger, and then becomes slightly weaker with the increase of the diameter of the hollow core, due to the combined effects of bigger hollow core and less explosive charge mass. For warheads under asymmetrical initiation, the second time acceleration becomes more obvious with the increase of the diameter of the hollow core, because the larger shaped charge efficiency enhances the collision of the detonation products. A modified formula was proposed to predict the initial fragment velocity in the aiming direction of a warhead with a hollow core under asymmetrical initiation. Experimentally verified numerical simulations were then used to verify the formula and the results showed that the new formula could predict the velocity very well. This work could offer a good reference for the design of tunable effects warheads and aimable warheads.

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Section: Numerical Simulation Methodssupporting

confidence: 89%

Section: Introductionsupporting

confidence: 53%

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

Dong

Liu

2019

Propellants Explo Pyrotec

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“…Then the front surfaces of the plates were painted black and a photograph was taken with illumination from behind each plate. And finally, the images obtained in this way were converted into grayscale bitmaps ( Figure 3), and the conversion was carried out in accordance with the methodology described in [10], using Arnold's method [23]. As shown in Figure 3, the number of holes pierced by the fragments from Specimen 2# was larger than that of holes pierced by the fragments from Specimen 1#, and the hole size distribution for Specimen 2# was more uniform.…”

Section: Witness Platementioning

confidence: 99%

“…In order to understand the reason why the deformation and fracture characteristics of metal rings were significantly different from those of the metal cylinder, the finite difference engineering package AUTODYN (14.0) was used to further investigate the fracture mechanisms of explosively driven cylinders and rings. It has been reported that eight-node solid elements can be used to simulate the dynamic behavior of the metal shells under internal explosive loading [8], and smoothed particle hydrodynamics (SPH) can be used to simulate the explosive charge [8,10]. Therefore, in the present work, the metal shells were modeled with eight-node solid elements, and the explosive charge was modeled with smoothed particle hydrodynamics (SPH).…”

Section: Numerical Simulationmentioning

confidence: 99%

“…However, the Gurney formula is unsuitable for calculating the axial distribution of fragment velocities because the rarefaction waves from the ends of warhead can make the fragment velocities lower at the two ends. In the past decades, the axial distribution of fragment velocities has been extensively studied to determine the low velocities near the warhead edges [5][6][7][8][9][10], and Huang's formula [7] showed high accuracy and wide applicability in the calculating of fragment velocity distribution along the axis of cylindrical casing under internal explosive loadings.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Fracture and Fragmentation Characteristics of Metal Cylinder and Rings Subjected to Internal Explosive Loading

Liu

Tian

et al. 2020

Materials

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Dynamic fracture and fragmentation characteristics of explosively driven rings and cylinders are important issues in the field of weapon effectiveness and protection. However, the comparison of fracture characteristics between metal cylinder and rings, and the fracture characteristics of the metal shells at different axial positions, are rarely touched. In the present work, a recovery tank was used to collect fragments, and witness plates were used to investigate the fragment spatial distributions. Before the test, the representative positions of metal shells were plated with copper layers to locate the original position of the recovered fragments. After the test, scanning electron microscopy and optical microscope were used for characterizing the microstructure of the recovered fragments from different positions. Then, the recovered fragments were weighed and measured to investigate their mass and size characteristics. In addition, numerical simulation was used to further investigate the fracture mechanisms of explosively driven cylinders and rings. It was found that the projection angle axial distribution of the fragments for the metal cylinder was similar to that of the fragments for the metal rings. However, the fracture characteristics of the metal rings were significantly different from those of the metal cylinder. The adiabatic shear band played a key role in the fracture process of the metal cylinder, whereas the adiabatic shear band had little chance to initiate in the fracture process of the metal rings because the metal rings could deform uniformly with much fewer strain localizations due to their much lower length. The fracture surfaces of the fragments from different positions of the metal cylinder were very smooth, whereas dimples were found in the fracture surfaces of the fragments from different positions of the metal rings. The mass distribution of the fragments from the metal rings was more uniform than that of the fragments from the metal cylinder, and the circumferential rupture strains of the metal rings were much larger than those of the metal cylinder.

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Simulation and Experimental Analysis of Multi-fragment Directional Warhead

Choudha

Kumaraswamy

2022

Lecture Notes in Mechanical Engineering

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Axial distribution characteristics of fragments of the warhead with a hollow core

Cited by 16 publications

References 13 publications

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

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

Dynamic Fracture and Fragmentation Characteristics of Metal Cylinder and Rings Subjected to Internal Explosive Loading

Simulation and Experimental Analysis of Multi-fragment Directional Warhead

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