Velocity characteristics of fragments from prismatic casing under internal explosive loading

Ning, Jianguo; Duan, Yan; Xu, Xiangzhao; Ren, Huilan

doi:10.1016/j.ijimpeng.2017.05.018

Cited by 27 publications

(14 citation statements)

References 9 publications

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“…Intending to study the influence of noncircular geometry on the fragment velocity, Ding [5], Guo [6][6] [7], Ning [8], and Marriott CO [9] studied the distribution of the fragment velocity of projectiles such as D-shape and prismatic projectiles. They found that during eccentric initiation, the detonation wave propagation was similar to that in a noncircular section, and the fragment velocity was no longer uniform.…”

Section: Introductionmentioning

confidence: 99%

“…They found that during eccentric initiation, the detonation wave propagation was similar to that in a noncircular section, and the fragment velocity was no longer uniform. Ning [8] designed a prismatic casing, which the fragment velocity was investigated experimentally by high-speed photography. The results indicate that the fragment velocity was influenced by the rarefaction wave from both the axial and transverse directions.…”

Section: Introductionmentioning

confidence: 99%

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Preformed Fragment Velocity Distribution of Elliptical Cross-section Projectile

Deng

Yang

et al. 2022

Lat. Am. j. solids struct.

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In the field of warhead design, non-cylindrical warhead, especially elliptical cross-section warhead, has received considerable attention. In this study, the initial velocity and distribution characteristics of the preformed fragments of a columnar projectile with an elliptical cross-section were examined. To obtain the velocity distribution of the fragments in this kind of projectile, three elliptical cross-section projectiles with different geometric sizes were test based on the static detonation tests. Then, the numerical models of the elliptical cross-section projectile have been established and validated according to the experiment results. Besides, two kinds of initiation types were studied by the simulation model, and the results indicate that not only the geometric size but the initiation type do great influences on the fragment velocity distribution in the direction of the axis. An empirical model was proposed based on the fragment two-step acceleration progress, and it was in good accordance with numerical results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preformed Fragment Velocity Distribution of Elliptical Cross-section Projectile

Deng

Yang

et al. 2022

Lat. Am. j. solids struct.

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“…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%

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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“…After detonating the explosive charge in the casing, the shell is broken into fragments that have equal velocity in all radial directions. However, in the recent research of aimable warhead, sometimes the explosive charge is not detonated on the axis, and even the casing itself may not necessarily be axially symmetric at all [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that convex and concave structures lead to the dispersion and convergence of fragments, respectively. Ning et al [3] studied the fragment velocity of a prismatic casing both experimentally and numerically. A correction formula was proposed to calculate the initial fragment velocity of the casing and successfully predicted the fragment velocity distribution of the prismatic casing.…”

Section: Introductionmentioning

confidence: 99%

Effect of Eccentric Initiation on the Fragment Velocity Distribution of D‐Shaped Casings Filled with Explosive Charges

Guo

Huang

Liu

et al. 2018

Propellants Explo Pyrotec

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Irregular casings filled with explosive charges are increasingly being developed for the designs of new warheads and explosive protection. In this work, we studied the fragment velocity of a semicircular D-shaped casing, which is a typical asymmetric casing. Static explosive experiments were conducted with D-shaped casings with different eccentric detonation coefficients (1/8, 3/8, 5/8, and 7/8) to determine their circumferential fragment velocity distributions. An empirical formula was then established to calculate the circumferential fragment velocity distribution for the D-shaped casing, and the calculation results of formula were found to agree well with experimental data. The D-shaped casing would have a uniform circumferential fragment velocity distribution when detonated at its central point, and the central point was determined by considering the empirical formula and the experimental data in combination. The results of the current work pave way for the innovative design of directional warhead and for further studying the dynamic response of asymmetric casing.

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Velocity characteristics of fragments from prismatic casing under internal explosive loading

Cited by 27 publications

References 9 publications

Preformed Fragment Velocity Distribution of Elliptical Cross-section Projectile

Preformed Fragment Velocity Distribution of Elliptical Cross-section Projectile

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

Effect of Eccentric Initiation on the Fragment Velocity Distribution of D‐Shaped Casings Filled with Explosive Charges

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