Oblique penetration of tungsten alloy rod to finite-thickness metal plate

Abstract

In order to study the critical ricochet velocity and critical penetration velocity of tungsten alloy rod obliquely penetrating a finite-thickness metal plate, experiment and numerical calculation of tungsten alloy rod impacting on homogeneous armor steel plate with a thickness of 30mm at an angle of 60° were carried out. Compared the experimental and numerical results with the results using models, it is found that, the results of the ricochet models proposed by Tate, Rosenberg and Steven B for semi-infinite thick plate are quite different from those of experiment and numerical calculation, so they can not be applied to the ricochet situation of finite-thickness plate. The critical penetration velocity model proposed by De Marre and Zhao are in good agreement with the numerical and experimental results, which can predict critical penetration velocity of tungsten alloy rod obliquely penetrating a finite-thickness metal plate with large impact angle. The penetration depth of the projectile under the critical ricochet velocity is about 1/3 of the thickness of the target plate, and the angle between the ejection trajectory of the fragments produced by projectile and target plate and projectile penetration trajectory is exactly 90° in the first penetration stage.

The Effect of Cold Swaging of Tungsten Heavy Alloy with the Composition W91-6Ni-3Co on the Mechanical Properties

“…Furthermore, by applying this method, different local cold hardening could be achieved by different total strain. It is necessary to make elongated subcaliber projectiles [ 16 , 17 , 18 , 19 , 20 , 21 ], which are classified as kinetic artillery (KE) projectiles characterized by high kinetic energy related to the area unit of the penetrator cross-section. The depth of penetration of kinetic artillery shells into metallic armored partitions depends on the following factors: the dynamic hardness and density of the shell materials (in this case the core).…”

“…In the next step, APFSDS projectiles with carbide-tungsten cores were developed. The development of sintering technology (deployment of such additives as nickel, iron, cobalt, copper, and rhenium) and the mechanical processing of tungsten sinters (e.g., perimeter swaging) made the slenderness of the penetrator increase from 10 to over 30 [ 18 , 19 , 20 , 21 ].…”

“…Recent research on tungsten heavy alloys used for subcaliber bullet cores has focused on increasing their effectiveness, as measured by the thickness of the armor pierced by them. Such actions increase strength while maintaining the highest possible density [ 16 , 17 , 18 , 19 , 20 , 21 ]. The desire to increase the strength properties while maintaining the possible high density, which, depending on the tungsten content in the alloy, has a negative impact on the resistance to dynamic loads.…”

Study on Bulge State of PCrNi3MoV Target Plates Penetrated by Square Fragments

“…Zhu et al [6] calculated the penetration resistance based on cavity expansion theory and decomposed the penetration process into A and B models, and the penetration equation of each model was presented. Cheng et al [7] studied the critical bounce and penetration velocities of a tungsten alloy rod obliquely penetrating a finite-thickness metal plate. The results showed that the test results were in good agreement with the calculation and numerical results of the critical penetration velocity model proposed by Zhao et al [8].…”

A study on the effectiveness of explosive reactive armour against the penetration of long-rod projectiles

“…The velocities of long-rod (monolithic) projectiles, often exceeding 1500 ms À1 , result in a hydrodynamic interaction with armour. 4,5 Cheng et al 5 conducted small-scale experiments using an 11 mm diameter tungsten rod with 90 mm length, fired at velocities around 1300 ms À1 into a 30 mm thick steel plate (also called a witness plate) at an angle of 60°. It was reported that the critical ricochet velocity and ballistic limit were within 100 ms À1 of each other, where tests within this range would lead to the projectile being embedded in the target without penetration.…”