On the friction effect in the perforation of metallic plates by rigid projectiles

Rosenberg, Z.; Vayig, Y.

doi:10.1016/j.ijimpeng.2020.103794

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…The AUTODYN code’s library was used for the parameters in the Gruneisen equation of state, of this aluminum alloy, and for its elastic constants ( E = 69 GPa and ν = 0.33). No friction was used in these simulations since it was shown by Rosenberg and Vayig (2021) that friction plays a negligible role in the penetration process at ordnance velocities (0.5–1.5 km/s). The aluminum targets were large enough to be considered as semi-infinite, with a diameter of 254 mm and thicknesses which were at least twice the penetration depths of the corresponding projectiles.…”

Section: Simulation Resultsmentioning

confidence: 99%

The penetration and ricochet of ogive-nosed rigid projectiles obliquely impacting metallic targets

Vayig

Rosenberg

2021

International Journal of Protective Structures

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A large number of 3D numerical simulations were performed in order to follow the trajectory changes of rigid CRH3 ogive-nosed projectiles, impacting semi-infinite metallic targets at various obliquities. These trajectory changes are shown to be related to the threshold ricochet angles of the projectile/target pairs. These threshold angles are the impact obliquities where the projectiles end up moving in a path parallel to the target’s face. They were found to depend on a non-dimensional entity which is equal to the ratio between the target’s resistance to penetration and the dynamic pressure exerted by the projectile upon impact. Good agreement was obtained by comparing simulation results for these trajectory changes with experimental data from several published works. In addition, numerically-based relations were derived for the penetration depths of these ogive-nosed projectiles at oblique impacts, which are shown to agree with the simulation results.

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Section: Simulation Resultsmentioning

confidence: 99%

The penetration and ricochet of ogive-nosed rigid projectiles obliquely impacting metallic targets

Vayig

Rosenberg

2021

International Journal of Protective Structures

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“…37a for M40, which also indicated that friction played more important role in the C4 case. Note that the friction coefficient varies during the penetration process [23], but, for simplicity, a constant value has been used in this work, since we mainly aimed at a qualitative study on the influence of friction on targets' ballistic performance. To the authors' knowledge, friction has been considered as significant only at an impact velocity closed to the ballistic limit velocity in existing research [15,[23][24][25][26][27][28].…”

Section: Effect Of Frictionmentioning

confidence: 99%

“…Note that the friction coefficient varies during the penetration process [23], but, for simplicity, a constant value has been used in this work, since we mainly aimed at a qualitative study on the influence of friction on targets' ballistic performance. To the authors' knowledge, friction has been considered as significant only at an impact velocity closed to the ballistic limit velocity in existing research [15,[23][24][25][26][27][28]. In contrast to the common understanding, it has been proved in this work that friction is also significant for fourlayered contacted and adhesive targets impacted by projectiles at a velocity (820 m/s) much higher than the ballistic limit.…”

Section: Effect Of Frictionmentioning

confidence: 99%

An Experimental and Numerical Study on the Ballistic Performance of Multi-Layered Moderately-Thick Metallic Targets against 12.7-mm Projectiles

Wang¹,

Li²,

Yan³

et al. 2022

Computer Modeling in Engineering &Amp; Sciences

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The main goal of this work is to study the ballistic performance of multi-layered moderately-thick metallic targets. Several target configurations have been considered in this work, with various types of interlayer connection (spaced, contacted and adhesive) and the number of layers (four and eight), and the influence of target configurations on ballistic performance has been studied experimentally and numerically. In the experiments, the targets were impacted by 12.7-mm projectiles at a velocity around 820 m/s. The experimental results show that, with similar total thickness, the contacted and adhesive targets exhibit better ballistic performance than the monolithic targets, and the four-layered targets are better than the eight-layered targets with the same connection type. To explore the ballistic resistance mechanism, numerical method has been used to simulate the penetration process of each target. The numerical results indicate that petal formation and friction have significant influence on targets' ballistic performance. Friction has stronger influence on the multi-layered targets than on the monolithic ones. According to the numerical results, about 14% of projectile's initial kinetic energy is dissipated by friction during penetrating the four-layered contacted target, which is proved to be the most effective type of target studied in this work. The results also indicate that, in contrast to common understanding, friction plays an important role even when the impact velocity is significantly higher than the ballistic limit. The outcome of this work may provide useful information for a better understanding of ballistic resistant mechanisms and more efficient utilization of multi-layered metallic targets in armor structural design.

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“…The targets in our simulations are large enough to be considered as semi-infinite (diameter = 260 mm and thickness = 300 mm). The issue of friction between projectile and target has not been addressed here since, according to Rosenberg and Vayig (2021), friction has a negligible role in high velocity penetration processes.…”

Section: A Revised Expression Of Rt For Spherical-nosed Rigid Project...mentioning

confidence: 99%

More on the penetration of spherical-nosed rigid projectiles into metallic targets

Vayig

Rosenberg

Ornai

2022

International Journal of Protective Structures

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This work deals with several issues related to the deep penetration of spherically nosed rigid projectiles impacting metallic targets at normal incidence. The most important issues in these processes are the constant resisting stress acting on the projectile beyond the initial entrance phase, the extent of the entrance phase, and the onset of cavitation at impact velocities higher than a certain threshold velocity. In this work, we derive a new relation for the target’s resisting stress in terms of its bulk and shear moduli and we also use a simplified analysis to account for the effect of the entrance phase on the depth of penetration for spherically nosed rigid projectiles. In addition, we highlight the role of cavitation in this process through numerical simulations for targets having very different densities.

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On the friction effect in the perforation of metallic plates by rigid projectiles

Cited by 12 publications

References 20 publications

The penetration and ricochet of ogive-nosed rigid projectiles obliquely impacting metallic targets

The penetration and ricochet of ogive-nosed rigid projectiles obliquely impacting metallic targets

An Experimental and Numerical Study on the Ballistic Performance of Multi-Layered Moderately-Thick Metallic Targets against 12.7-mm Projectiles

More on the penetration of spherical-nosed rigid projectiles into metallic targets

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