Penetration performance of disk shaped penetrators

Bjerke, Todd W.; Zukas, Jonas A.; Kimsey, Kent D.

doi:10.1016/0734-743x(92)90460-b

Cited by 23 publications

(13 citation statements)

References 14 publications

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“…Measured hardness on the Brinell hardness number scale was 321 Bhn. The target differed from targets in previous studies such as Bjerke et al (1992), which used semi-infinite block targets with a lower hardness in the range of 241-277 Bhn. The plate's normal was positioned 65° relative to the shotline as shown in Figure 1.…”

Section: Methodsmentioning

confidence: 86%

“…The tungsten was swaged to a 25% area reduction. Nominally, the disks had a length of 2.39 mm, a diameter of 19.2 mm, and a mass of 13 g. The resulting L/D of 1/8 was chosen based on the work of Bjerke et al (1992). The diameter of each sabot was sized appropriately for the 50-mm bore of the gun used.…”

Section: Methodsmentioning

confidence: 99%

“…Studies by Herberte (1989), , and indicated a trend of increasing penetration per unit length (P/L) with a decreasing L/D at velocities above 1.5 km/s. Bjerke et al (1992) examined the problem in detail and found a maximum P/L at a L/D of 1/8 for a nominal velocity of 2 km/s. Like previous studies, though, the effort focused on 0° obliquity targets.…”

Section: Introductionmentioning

confidence: 99%

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Penetration of a Highly Oblique Steel Plate by a Thin Disk

Bruchey¹,

Kimsey²

2002

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Segmented rod penetrator concepts created interest in the ballistic performance of high-density, low length-to-diameter (L/D) ratio penetrators, but there was a lack of data showing the performance of such thin disks vs. high-obliquity targets. An experimental and computational study was conducted to examine the basic case of a single tungsten heavy alloy disk with an L/D of 1/8 impacting a high-obliquity (65°) rolled homogeneous armor steel plate at a nominal velocity of 2 km/s. The study provides valuable insight into the penetration process. Results include depths of penetration and penetration per unit length. Good agreement is seen between the experimental data and the CTH simulation; both show a ricochet phenomenon. Results are also compared to comparable previous studies, and possible explanations for differences are given.u

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Section: Methodsmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Penetration of a Highly Oblique Steel Plate by a Thin Disk

Bruchey¹,

Kimsey²

2002

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“…Plate-like segment penetrate more efficiently because less energy is dispersed in the lateral direction and more in the direction of the crater formation thus causing greater depth of penetration [2]. Bjerke et al conducted a series of experiments shooting single segments in the 2 km/s range and found that L/D=1/8 to be the most efficient aspect ratio [3]. As segments of L/D=1/8 clearly demonstrate an optimal aspect ratio, they have thus been selected for further studies in other applications.…”

Section: Introductionmentioning

confidence: 99%

A computational study of segmented tungsten rod penetration into a thick steel target plate at high velocities

Presnell¹,

Rajendran²

2012

AIP Conference Proceedings

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Abstract. This paper presents results from numerical simulations of a configuration in which a tungsten heavy alloy SRP penetrates a thick RHA 4340 steel at 2.6 km/s using the 2006 version of the Lagrangian finite element code EPIC. Penetration experimental data show improved penetration efficiency by the segmented projectiles when compared to monolithic (single solid rod) projectiles. For SRP with an aspect ratio (L/D) = 1/8, a loss in penetration efficiency was seen upon successive segment impacts. The projectile configuration considered in this study was collinear impacts of eight successive discs which measured 2mm in thickness and 16mm in diameter. The EPIC simulations considered a range of parameters that influenced the Depth of Penetration (DOP) including element-particle conversion, spacing and number of segments, failure criteria, impact velocity, and mesh resolution. The EPIC results are also compared with open-literature DOP data from simulations using an Eulerian finite element code, AUTODYN for a similar configuration. In addition, the effects of back-flowing ejecta generated by the impact of first segment on the penetration processes of subsequent segments were studied in details. An alternate SRP design is proposed in this paper to alleviate the ejecta problem.

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“…Recently, computational and experimental studies have focused on characterizing and understanding the penetration mechanics of high-density metallic projectiles with an L/D ratio of less than 1 [20][21][22] This report summarizes a numerical study to examine the penetration performance of multiple (i.e., three) tungsten heavy alloy (WHA), axially offset, disk-shaped projectiles impacting semi-infinite rolled homogeneous armor (RHA) at a striking velocity of 2.6 km/s. The separation distance between each disk-shaped projectile is 3.25 projectile diameters.…”

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confidence: 99%

Penetration of Multiple, Axially Offset, Disk-shaped Penetrators

Kimsey¹,

Schraml²

Civil-Comp Proceedings

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The terminal ballistic performance of high-velocity, low length-to-diameter (L/D) ratio projectiles impacting steel targets has been a topic of considerable interest in penetration mechanics to evaluate the efficacy of segmented projectiles.A computational study has been conducted to examine the penetration performance of multiple (i.e., three), axially offset, disk-shaped projectiles impacting semi-infinite rolled homogeneous armor (RHA). A constant 3.25 projectile diameter separation distance between each disk-shaped projectile was maintained for the impact conditions modeled in this study. The three-dimensional (3-D) simulations suggest that the total depth of penetration into steel is not degraded for disk offsets less than 0.5 projectile diameters based on the range of disk offsets modeled in the study.n

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Penetration performance of disk shaped penetrators

Cited by 23 publications

References 14 publications

Penetration of a Highly Oblique Steel Plate by a Thin Disk

Penetration of a Highly Oblique Steel Plate by a Thin Disk

A computational study of segmented tungsten rod penetration into a thick steel target plate at high velocities

Penetration of Multiple, Axially Offset, Disk-shaped Penetrators

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