The Dispersion Rule of Fragments about the Asymmetric Shell

Lee, Ding; Li, Zhenduo; Liang, Minzu; Li, Xiangyu; Lu, Fangyun

doi:10.1155/2017/9810978

Cited by 12 publications

(17 citation statements)

References 11 publications

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“…The mechanical parameters of the material model were not the default parameters in LS-DYNA, which were provided by the material supplier. These material parameters had been verified by numerical simulations and experiments, the detailed analysis of which can be found in Ding et al 28 …”

Section: Fe Modelmentioning

confidence: 81%

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Rapid assessment of the spatial distribution of fragments about the D-shaped structure

Lee

et al. 2018

Advances in Mechanical Engineering

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The deformable warhead is a common type of anti-missile warheads, and the geometric configuration of deformable warhead is close to D shape under the lateral blast loading of auxiliary charge. In this article, the spatial distribution of fragments is taken as the research object, and an empirical model for evaluating the spatial distribution of fragments is expected to be established. First, the empirical model was designed based on dimensional analysis and quadratic interpolation. Then, three different D-shaped structures (D-90°, D-120°, D-150°) were studied by the numerical simulations and experiments. In order to minimize the influence of the axial sparse waves at both ends, only the middlemost layer of fragments was researched. The relationships among d/r, sin a, and sin b were obtained (where d represents the initiation distance, a represents the initial position angle, and b represents the scattering angle). With the scattering angle b and target distance l, the spatial distribution of fragments can be deduced. Based on the fitting formula and the parameters of D-shaped structures, the relationships between d/r, sin a, and sin b of arbitrary D-shaped casing (D-u) were obtained using quadratic interpolation. Finally, D-105°structure was verified by numerical simulation and empirical formula, both of which coincided well with each other. Therefore, the empirical model can be used to rapidly evaluate the spatial distribution of fragments, especially suitable for the D-shaped structure with a large length-diameter ratio.

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Section: Fe Modelmentioning

confidence: 81%

“…Gong et al 26 and Wang et al 27 reported an empirical formula and a new method to estimate the projection angles and fragment velocities of D-shaped cylindrical casing. Ding et al 28 studied the spatial distribution and velocity of fragments about the concave-shaped and convex-shaped asymmetric structures.…”

Section: Introductionmentioning

confidence: 99%

Rapid assessment of the spatial distribution of fragments about the D-shaped structure

Lee

et al. 2018

Advances in Mechanical Engineering

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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%

“…In the case of asymmetric casing, the explosive loading on the shell is not equal at different azimuth angles, and the circumferential velocity distribution is thus not uniform. Besides, the fragments may converge or disperse after detonation [2]. For designing novel warheads, it is therefore essential to study the fragment velocity distribution of asymmetric casings under internal explosive loading.…”

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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“…The asymmetric cylindrical structure can be roughly divided into three types: the concave-shaped, convex-shaped, and D-shaped. The research on concave-shaped and convex-shaped types has been described in another article [20]. Therefore, this paper mainly focuses on the D-shaped structure, and several experiments were carried out to investigate the influence of the central angle on the spatial distribution, fragment velocity and energy output.…”

Section: Introductionmentioning

confidence: 99%

Research into the Energy Output of Asymmetric Cylindrical Structure under Internal Explosion Loading

Lee

et al. 2018

Energies

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Abstract:The energy output characteristic of an asymmetric cylindrical structure under internal explosion loading has significant research value in the field of the national defense industry. This paper took the D-shaped structure as the research object. Three groups of experiments (D-90 • , D-120 • , D-150 • ) were carried out. The D-shaped structure showed that fragments are concentrated in the middle and are sparse on both sides. Moreover, the fragment density decreased with the increase of the azimuth angle. The fragment velocities, which were measured from high-speed photography and an oscilloscope, coincided well with each other, and decreased with an increase in the central angle. Compared with the cylindrical structure, the fragment energy gain of the D-shaped structure is significant; the total energy and energy density of the three D-shaped structures were very close to each other. This indicates that D-120 • is the optimal solution among the three D-shaped structures and it can provide guidance for the future design of D-shaped structures to achieve higher energy output.

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The Dispersion Rule of Fragments about the Asymmetric Shell

Cited by 12 publications

References 11 publications

Rapid assessment of the spatial distribution of fragments about the D-shaped structure

Rapid assessment of the spatial distribution of fragments about the D-shaped structure

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

Research into the Energy Output of Asymmetric Cylindrical Structure under Internal Explosion Loading

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