On the friction effects on rigid-body penetration in concrete and aluminium-alloy targets

Chai, Chuan-guo; Pi, Aiguo; Li, Q.M.; Huang, Fenglei

doi:10.1016/j.dt.2019.03.003

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…The difference may also be attributed to the difference in friction between the projectile and the target; therefore, it was not considered exactly during the numerical simulation of the experiment. Furthermore, the friction is mutative, which increases in the experiment, and as a result, a constant coefficient of friction as considered in FEM is not enough to show an accurate result [38,39]. As a result, when the numerical simulation result is considered in a probabilistic range of solutions should be considered.…”

Section: Discussionmentioning

confidence: 99%

Mesh regularization through predictive scaling factors based on material model parameter estimation for debris impact test on titanium alloy (TI-6Al-4V) plate.

Tabiei,

Patro

2024

Preprint

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The mesh Size is a crucial element of the FEA simulation. This study focuses on mesh regularization, which is the process of removing mesh dependency from FEA simulations. These techniques are commonly used to match experimental data and reduce computational time. In this study, mesh regularization was approached using a material failure criterion based on the element size. However, the current approach to failure scaling based on the element size is a trial-and-error process. To address this, four different analytical models were formulated to predict the scaling factors based on the failure criterion vs. mesh size. The material model-based scaling factors were determined for the tensile tests using 11 different mesh sizes. These predictive scaling factors were then compared with the scaling factor obtained using the conventional tensile testing method. The findings of this study show that using the scaling factors found through the experimental method eliminates errors in the tensile test model, and the predicted scaling factor significantly reduces the error in force-displacement for different mesh sizes compared to the base mesh size. Additionally, in the debris impact test, the predictive scaling factors reduced the deviation in residual velocity to 1.67 % from the initial 17.81 %, and the maximum deviation in energy absorption was reduced from 48.40 % to 8.10 % without scaling factors. This study introduces a new method for predicting material-model-based scaling factors for mesh regularization and discusses the applicability of this method to various problems.

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Section: Discussionmentioning

confidence: 99%

Mesh regularization through predictive scaling factors based on material model parameter estimation for debris impact test on titanium alloy (TI-6Al-4V) plate.

Tabiei,

Patro

2024

Preprint

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“…The friction issue was discussed in Rosenberg and Dekel (2016) for penetrations in metallic targets, and it was found to have a small effect (at most 3%) on the penetration depth. On the contrary, Chai et al (2019) claim that friction can play a role of up to 10% on the penetration into metallic and concrete targets. We do not deal with this issue here, mainly because we do not have data to assess the effect of friction on the limestone targets.…”

Section: Analysis Of the Penetration Data In Limestone 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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“…It has been widely used in military and civil building protection structures. Therefore, the impact of missiles on concrete targets has long been the focus of weapon designers and protective engineers [1][2][3][4][5]. Currently, the missiles, which were widely studied to impact concrete targets, include ogive-nosed projectiles [6,7], flat-nosed projectiles [8], soft missiles [9], etc.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of semi-infinite concrete targets subjected to tubular projectiles impact

Wang

Yuan

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Improving the penetration efficiency of missiles into concrete is a practical research topic. In this paper, a tubular projectile was designed to enhance penetration diameter on concrete targets. To validate numerical simulation methods, an experiment of an ogive-nosed projectile penetrating a semi-infinite concrete target was reproduced by numerical simulation. Based on the validated numerical model, the penetration progress of a tubular projectile into a semi-infinite concrete target was analyzed. By assessing the penetration tunnel diameter and depth, the effects of key parameters, i.e., the wall thickness (15.0, 30.0, 60.0, 90.0, 120.0 mm) and velocity (400.0, 600.0, 800.0, 1000.0, 1200.0, 1400.0 m/s) of tubular projectile on penetrating concrete targets have been investigated in detail. Furthermore, the penetration performances of flat-nosed projectiles and tubular projectiles on concrete targets with the same mass were compared. The results indicate that with the increase in the wall thickness and velocity of the tubular projectiles, the penetration depth of the projectiles into the concrete target increases gradually, and the increase in the diameter of the tunnel is not obvious. In the case of the wall thickness of the tubular projectile which is greater than or equal to 30.0 mm, the concrete core, near the head of the tubular projectile, is completely fractured and separated from the concrete target. When the flat-nosed projectiles have the same mass and length with tubular projectiles, the diameter of the tunnel caused by the tubular projectile on the concrete targets is always much larger than that caused by the flat-nosed projectiles. The difference of them can be 60.5%. In the condition that the flat-nosed projectiles have the same mass and diameter with tubular projectiles, the depth of the tunnels caused by tubular projectiles in the concrete targets is always much larger than that caused by flat-nosed projectiles. The difference of them can be 95.6%.

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On the friction effects on rigid-body penetration in concrete and aluminium-alloy targets

Cited by 8 publications

References 17 publications

Mesh regularization through predictive scaling factors based on material model parameter estimation for debris impact test on titanium alloy (TI-6Al-4V) plate.

Mesh regularization through predictive scaling factors based on material model parameter estimation for debris impact test on titanium alloy (TI-6Al-4V) plate.

The penetration of limestone targets by rigid projectiles: Revisited

Failure analysis of semi-infinite concrete targets subjected to tubular projectiles impact

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