Fragment characteristics of cylinder with discontinuous charge

Gao, Yueguang; Feng, Shunshan; Xiao, Xifeng; Zhang, Bo; Huang, Qi

doi:10.1016/j.ijimpeng.2022.104479

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…To analyze the dispersion of prefabricated fragments in the full spatial and temporal domain, Wang et al [ 21 ] used the continuum–discontinuum element method [ 22 ] to investigate the large deformation and cross-scale calculations of the warhead rupture process. The current research on shell fracture and fragments formation additionally includes different shell thicknesses [ 23 ], variable charge geometries [ 24 ], ductile metal shear fracture [ 25 , 26 ], end-constrained casing fracture [ 27 ], cylindrical discontinuous charges [ 28 ], axial velocity distribution [ 29 , 30 , 31 ], and the effect of initial velocity on fragment size [ 32 , 33 ]. Currently, natural fragment formation studies mainly involve thick-walled shells and low charge-to-shell ratios, resulting in slower initial fragment scattering velocities [ 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Fracture and Fragmentation of Implosively Driven Thin-Walled Cylindrical Shell: From Thermodynamic Analysis to CDEM Simulation

Ou¹,

Yuan²,

Jiao³

et al. 2023

Materials

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The scattering of fragments is a notable characteristic of the explosive detonation of a shelled charge. This study examines the fracture and fragmentation of the shell and the process by which natural fragments form under the strains of implosion. The analysis takes into account both the explosive’s energy output and the casing’s dynamic response. For this purpose, utilizing a thermochemical code as an alternative to the conventionally employed cylinder test, the Jones–Wilkins–Lee equation of state (JWL EOS) was calibrated within a range of relative specific volume up to 13. The detonation of the shelled charge was subsequently analyzed using the continuum–discontinuum element method (CDEM). Following this, the formation mechanisms and scattering characteristics of natural fragments were scrutinized. The analysis found that the shell predominantly experiences shear failure with uniform evolution, displaying a “hysteresis effect” and two mutation stages in the evolution of tensile failure. Within the JWL EOS’s calibrated range, the representation of fragment displacement and velocity improved by 47.97% and 5.30%, respectively. This study provides valuable guidance for designing the power field of warheads and assessing their destructive power.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Fracture and Fragmentation of Implosively Driven Thin-Walled Cylindrical Shell: From Thermodynamic Analysis to CDEM Simulation

Ou¹,

Yuan²,

Jiao³

et al. 2023

Materials

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Dynamic mechanical response and failure behavior of solid propellant under shock wave impact

Wang,

Zhang

et al. 2024

Engineering Failure Analysis

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Experimental and numerical simulation study on the crushing of shell with central pre-formed groove

Li,

Yao,

Zhu

et al. 2024

J. Phys.: Conf. Ser.

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To improve the lethality of fragmentation bombs against enemy personnel and other targets, one of the primary goals is to generate as many high-speed, effective fragments as possible. A thin shell structure with central pre-formed groove, processed via selective laser melting (SLM), was designed. A shell-crushing test utilizing a water medium was conducted. The fragment formations of the parallelogram pre-formed groove grid and the square pre-formed groove grid were compared. Additionally, the AUTODYN commercial finite element software was used to simulate the influence of different grid sizes and grid angles of the parallelogram pre-formed groove grid on fragment formation. The results indicate that when the grid angle exceeds 60°, the effective fragment generation rate decreases as the grid angle increases, while the fragment conjoined rate increases significantly with the increase in grid angle. The grid size has virtually no effect on the effective fragment generation rate and the fragment conjoined rate.

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Fragment characteristics of cylinder with discontinuous charge

Cited by 3 publications

References 30 publications

Investigation of the Fracture and Fragmentation of Implosively Driven Thin-Walled Cylindrical Shell: From Thermodynamic Analysis to CDEM Simulation

Investigation of the Fracture and Fragmentation of Implosively Driven Thin-Walled Cylindrical Shell: From Thermodynamic Analysis to CDEM Simulation

Dynamic mechanical response and failure behavior of solid propellant under shock wave impact

Experimental and numerical simulation study on the crushing of shell with central pre-formed groove

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