Numerical and Experimental Study on the Formation and Dispersion Patterns of Multiple Explosively Formed Penetrators

Liu, Jianfeng; Long, Yuan; Ji, Chong; Xu, Quan; Gao, Fu Yin; Zhao, Chang Xiao

doi:10.1590/1679-78253385

Cited by 5 publications

(8 citation statements)

References 7 publications

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“…They also observed that increasing the ductility of the liner increased the length-to-diameter ratio of the central penetrator by 276%. Liu et al (2017) succeeded in the development of a 3D model for the analysis of the formation and dispersion of the MEFPs. Using simulation results, they developed a non-linear model for the dispersion pattern of the penetrators.…”

Section: Multiple Explosively Formed Penetrators (Mefps)mentioning

confidence: 99%

A practical review study on shaped charge in the last two decades (2000–2020)

Mehmannavaz

Ramezani

Nabakhteh

et al. 2021

International Journal of Protective Structures

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Shaped charges are devices used for cutting or penetrating different aerial, on land, and underwater targets, based on the concentration of the explosion energy to the liner. The purpose of this study is to present a practical review of the studies related to shaped charges in the last twenty years (2000–2020). In this regard, these studies have been reviewed in two different categories for ordinary and advanced shaped charges. In the case of ordinary shaped charges, different aspects including shaped charges against different targets, different types of shaped charges (such as linear shaped charge and explosively formed penetrators), and theoretical advancements are presented. On the other hand, the new kinds of shaped charges developed for a specific purpose are introduced in the case of advanced shaped charges. The survey of the literature indicates that different concepts such as cut-off velocity and theoretical applicability of hydrodynamics theory in shaped charge penetration still Requires effort. Also, few studies have been focused on new shaped charges, such as hyper-velocity shaped charges, annular and dual-mode ones; and the field is still open for further progress. Besides, some of these new shaped-charges, such as double-layer shaped charges, are not realistic enough to be produced for practical purposes or the market.

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Section: Multiple Explosively Formed Penetrators (Mefps)mentioning

confidence: 99%

A practical review study on shaped charge in the last two decades (2000–2020)

Mehmannavaz

Ramezani

Nabakhteh

et al. 2021

International Journal of Protective Structures

View full text Add to dashboard Cite

show abstract

“…At present, the research on MEFP warheads can be divided into two categories in the dispersion direction of formed projectiles. The first one is that the liner is arranged along the axis of the charge [2][3][4][5][6][7][8][9], and the explosively formed projectile (EFP) flies away in the axial direction of the charge; the second one is that the liner is arranged along the circumferential direction of the charge [10][11][12][13][14], and the EFP flies along the radial direction of charge. In related literature [2][3][4][5][6][7][8][9][15][16][17], there are many research works on the forming characteristics of the projectile when it is scattered along the charge axis.…”

Section: Introductionmentioning

confidence: 99%

“…The first one is that the liner is arranged along the axis of the charge [2][3][4][5][6][7][8][9], and the explosively formed projectile (EFP) flies away in the axial direction of the charge; the second one is that the liner is arranged along the circumferential direction of the charge [10][11][12][13][14], and the EFP flies along the radial direction of charge. In related literature [2][3][4][5][6][7][8][9][15][16][17], there are many research works on the forming characteristics of the projectile when it is scattered along the charge axis. Li Peng [13] et al applied eccentric initiation technology to the MEFP warhead through static detonation experiment and numerical simulation, and found that the eccentric initiation could improve the molding results of MEFP, and greatly improved the velocity of the shaped projectile and the penetration depth of the target plate in the directional region.…”

Section: Introductionmentioning

confidence: 99%

“…In the study of the MEFP warhead in the literature [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], there are two significant features. One is that the wall thickness is equal to the shell and liner, and the other is that the liner is designed separately from the shell.…”

Section: Introductionmentioning

confidence: 99%

“…However, if the shell and liner integrated design is adopted, the production process will be simplified, and the production efficiency will be improved. In the study of MEFP warhead forming characteristics in the literature [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], the wall thickness is equal to the shell and liner, and the forming characteristics of liner with variable wall thickness are rarely reported. Therefore, LS-DYNA software will be used in this study to simulate the forming characteristics of the circumferential MEFP when the liner is of variable wall thickness.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the Forming Characteristics of Small-Caliber Ammunition with Circumferential MEFP

Liu

et al. 2020

Materials

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To study the influence of the structural parameters of the ammunition liner of small-caliber ammunition on the forming characteristics of the projectile, an integrated circumferential multiple explosively formed projectile (MEFP) warhead with an integrated shell and the liner was initially designed, and the wall thickness of the liner is variable. LS-DYNA finite-element software is used to simulate the integral circumferential MEFP of the preliminary design, based on the numerical simulation results, the influence of the thickness at the center of the liner, and the curvature radius of the liner on the shape and velocity of the formed projectile. The numerical simulation results show that when the thickness of the center of the liner is constant and the curvature radius increases gradually, the velocity of the formed projectile decreases and the length: Diameter ratio of formed projectile decreases gradually. When the curvature radius of the liner remains unchanged, the velocity of the formed projectile decreases with the increase of the thickness of the center of the liner, and the shape of the formed projectile does not change significantly. The results show that when the design of integrating the shell and the liner was adopted for the integral circumferential MEFP warhead, the shape of the formed projectile is greatly affected by the curvature radius of the liner (curvature radius of inner and outer walls of the liner), but less by the thickness of the center of the liner. The velocity of the formed projectile is affected by the curvature radius of the inner and outer walls of the liner and the thickness of the center of the liner. Moreover, the influence of the thickness of the center of the liner on the velocity of the formed projectile is greater than that of the curvature radius of the outer wall of the liner.

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Numerical simulation of the forming characteristics of the circumferential MEFP with integrated shell and liner

Zhang

et al. 2021

J. Phys.: Conf. Ser.

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To study the forming characteristics of the multiple explosively formed projectile (MEFP) warhead of the small-caliber grenade with the integrated design of the liner and shell, the liner thickness is less than the shell thickness as the research object, and LS-DYNA is used for numerical simulation. On this basis, the influence of the curvature radius and the center thickness of the liner on the forming results of the projectile is further studied, and the integrated design of the MEFP forming result and the separate design were compared and analyzed. The simulation results show that, when the liner thickness structure is smaller than the shell thickness, the projectile shape is better. The shape of MEFP with the integral design is better than the separate design, and the forming velocity of the integral design is slightly lower than the separate design with the curvature radius increase of the outer and inner wall. When the liner curvature radius is fixed, the shape of MEFP with the integral design is better than the separate design, and the forming velocity of MEFP with the integral design is slightly less than the separate design with the liner center thickness increase. The results show that the forming characteristics of circumferential MEFP of integrated design and separate design have a certain similarity. The shape of MEFP with the integrated design is better than that with separate design, however, the forming velocity of MEFP with the integrated design is slightly lower than that with separate design.

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Numerical and Experimental Study on the Formation and Dispersion Patterns of Multiple Explosively Formed Penetrators

Cited by 5 publications

References 7 publications

A practical review study on shaped charge in the last two decades (2000–2020)

A practical review study on shaped charge in the last two decades (2000–2020)

Study of the Forming Characteristics of Small-Caliber Ammunition with Circumferential MEFP

Numerical simulation of the forming characteristics of the circumferential MEFP with integrated shell and liner

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