Analytical model of hypervelocity penetration into rock

Li, Jie; Wang, Mingyang; Cheng, Yanling; Qiu, Yanyu

doi:10.1016/j.ijimpeng.2018.08.008

Cited by 12 publications

(15 citation statements)

References 26 publications

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“…Figure 1 depicts the change of DOP with the impact velocity [3] (h is the DOP, L is the total length of the projectile, and υ 0 is the impact velocity). As shown in the figure, when the impact velocity is low, the DOP increases until the velocity reaches a critical value and then decreases dramatically with the velocity.…”

Section: Dynamic Behaviors Of Projectile and Target During Penetrationmentioning

confidence: 99%

“…With increasing the impact velocity, the interactions between projectile and target become more intense, and the behaviors of the projectile can be divided into four states as follows [3]:…”

Section: Dynamic Behaviors Of the Projectilementioning

confidence: 99%

“…e projectile was entirely eroded at the impact velocity of 3360 m/s. Li et al [3] penetrated granite targets with alloy steel projectiles. e percentage of mass loss reached 88% when the impact velocity was 2378 m/s, and the velocity range of severe mass loss corresponded to that of DOP decreasing.…”

Section: Introductionmentioning

confidence: 99%

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Mass Loss and Penetration Depth of Hypervelocity Projectiles

Qiu

et al. 2021

Shock and Vibration

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Numerous investigations recorded a dramatic decrease in penetration depth at hypervelocity. The decrease is due to the severe mass loss of the projectile. The mechanics of mass loss are complicated, so the entirely theoretical model is still absent. In this paper, we derive a semitheoretical formula for mass loss by solving the equation of motion of the projectile during penetration. The result shows that the decrease in projectile mass at hypervelocity accords with the power law. Furthermore, we obtain a continuous formula for depth of penetration in the entire velocity domain. The theoretical results agree well with experimental data. The formula for the critical velocity of depth decreasing is also obtained as a by-product of the solving procedure.

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Section: Dynamic Behaviors Of Projectile and Target During Penetrationmentioning

confidence: 99%

Section: Dynamic Behaviors Of the Projectilementioning

confidence: 99%

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Mass Loss and Penetration Depth of Hypervelocity Projectiles

Qiu

et al. 2021

Shock and Vibration

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“…Obviously, this relation cannot be applied for rock targets having very low compressive strength, and it should be checked against other data for rock penetrations, when these become available. In section “Granite targets,” we compare the predictions from this relation with experimental results from two impact tests on granite targets which were reported by Li et al (2018).…”

Section: The Size Effect In the Unconfined Compressive Strength Of Rocksmentioning

confidence: 99%

“…We mentioned above the scarcity of published data on deep penetrations in rock targets by rigid projectiles. Still, the work of Li et al (2018) provides a few tests which can be used for our present analysis. They impacted granite targets with CRH3 ogive-nosed steel projectiles, with D p = 10.8 mm, at velocities in the range of 1.2–4.1 km/s.…”

Section: Granite Targetsmentioning

confidence: 99%

The penetration of limestone targets by rigid projectiles: Revisited

Rosenberg

Vayig

Malka-Markovitz

et al. 2020

International Journal of Protective Structures

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We reanalyze the results from a set of terminal ballistics tests in which large limestone targets were impacted by similarly shaped rigid projectiles having different sizes. Our first goal is to show that the data in terms of penetration depths as a function of impact velocity can be accounted for by a model in which the limestone’s resistance to penetration is constant throughout the penetration process. It turns out that the actual values of this penetration resistance, as derived from the data, decrease with the projectile’s size. This is a clear manifestation of a scaling issue in the terminal ballistics of the limestone rock. In order to account for this issue we assume that it is closely related to the size effect in the compressive strengths of rock specimens. Finally, we offer a simple procedure by which one can define a surrogate material model for the targets in numerical simulations, in order to predict the penetration depths in limestone, and possibly other rock targets, under both normal and oblique impacts.

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