Jet penetration into low density targets

Mayseless, M.; Genussov, R.

doi:10.1016/s0734-743x(99)00106-2

Cited by 7 publications

(7 citation statements)

References 1 publication

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“…In their experiment, a tungsten rod impacted a and β set equal to 8.5 and 2, respectively, although, at such a high impact velocity, the results show very little sensitivity to their variations. The predicted maximum penetration was 203 mm, which is in perfect agreement with the value given by the shaped charge jet hydrodynamic model according to which [20] .…”

Section: Time Historiessupporting

confidence: 87%

“…As with numerical simulations, the present model also predicted, for very high impact velocities, maximum penetrations close to those given by the hydrodynamic theory governing shaped charge jet penetration. The latter model yielded eqn (20) for maximum penetration, which has been enhanced to include the cratering effect [9]. The predictions from the present system of differential equations are similar to those obtained from eqn (20) as well as a simple hydrodynamic relation for the penetration rate [9].…”

Section: Discussionsupporting

confidence: 75%

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Reworking a Simple Model for Deformable Projectile Penetration Into Thick Targets

Syngellakis

2018

WIT Transactions on the Built Environment

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Target penetration by deformable projectiles is considered in the context of an established onedimensional theory based on the fundamental balance laws of continuum mechanics. The paper critically reviews the assumptions of this simple analytical model and discusses the material characteristics that influence resistance to penetration. A novel representation of the resisting force is introduced into the original analysis leading to the evaluation of the crater size in addition to other critical output such as depth of penetration and the time history of the impact force over a relevant range of impact energies. An algorithm for a time step integration of the resulting system of differential equations is proposed; this is numerically implemented through a FORTRAN code whose effectiveness and reliability are tested against experimental data from the technical literature. This comparison leads to rational and consistent estimates for the empirical factors adopted in the simplified modelling. The time histories of impulse provided by the computer implemented analysis can be used for the assessment of the effect of the transmitted shock on the supporting structure and its appendices.

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Section: Time Historiessupporting

confidence: 87%

Section: Discussionsupporting

confidence: 75%

Reworking a Simple Model for Deformable Projectile Penetration Into Thick Targets

Syngellakis

2018

WIT Transactions on the Built Environment

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“…The original jet tip velocity before the impact is 8500 m/s. It is seen that replacing the steel plate with ceramic or glass plate increases the erosion of the jet, which is a result of the lower density according to the dependence of hydrodynamic penetration to density 44 . In particular, switching the front plate yielded better results as compared to the back plate.…”

Section: Resultsmentioning

confidence: 97%

Effect of material properties on interaction of ceramic and glass flyer plates with hypervelocity jet

Deniz

Yıldırım

2022

Int J Applied Ceramic Tech

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A study on the effect of material properties on the interaction of explosively driven ceramic and glass plates with shaped charge jets is performed in order to bolster future studies on the design of reactive cassettes with non‐steel flyer plates. A symmetric steel reactive cassette construction is taken as a base, and front and back plates are selectively changed with ceramic or glass plates keeping the areal densities similar. Plates manufactured from two different grades of alumina, silicon carbide, boron carbide, and borosilicate glass are employed to assess the ballistic protection performance of reactive cassettes. It is seen that a high density and fracture toughness is desired for the front plate and high bulk impedance for the back plate, respectively. Moreover, replacing the front plate of a steel cassette with an alumina or silicon carbide plate increases the ballistic protection efficiency close to 50%. Finally, the effect of material selection is investigated by hydrocode numerical simulations. The early phases of the interaction process are presented to reveal the basics of initial hole closure on the flyer plate and the determination of the length of the jet precursor.

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“…In both cases, the objective is to stop a continuous stretching jet with a tip velocity of 8 Km/s, Cutoff velocity is assumed to be the same for both configurations and the charge is initiated at a constant distance from the outer plate. Figure 18 presents the calculation results of the various effectiveness factors, based on the study presented in Ref, [12], and described above.…”

Section: Materials Effectmentioning

confidence: 99%

Effectiveness of Explosive Reactive Armor

Mayseless

2011

Journal of Applied Mechanics

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Explosive reactive armor (ERA) is a type of add-on armor that ustialty consists of tiles made of two metal plates with an e.xplosive layer in between. The ERA is placed at a certain distance from the main armor to enhance its performance. ERA design is optimized based on the required effectiveness of the tiles. Various methods of defining ERA effectiveness are described. The effectiveness parameters ofthe mass-ßux model and its derivatives, the effect of material properties, the escape length of the fet tip precursor, the explosive layer thickness, and the edge effects are analyzed, and correlations betören them are presented. Analysis tesults are compared with available experimental data and a very good correlation isfound.

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Jet penetration into low density targets

Cited by 7 publications

References 1 publication

Reworking a Simple Model for Deformable Projectile Penetration Into Thick Targets

Reworking a Simple Model for Deformable Projectile Penetration Into Thick Targets

Effect of material properties on interaction of ceramic and glass flyer plates with hypervelocity jet

Effectiveness of Explosive Reactive Armor

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