Failure behavior of projectile abrasion during high-speed penetration into concrete

Ning, Jianguo; Zhao, Li; Ma, Tianbao; Xu, Xiangzhao

doi:10.1016/j.engfailanal.2020.104634

Cited by 13 publications

(8 citation statements)

References 41 publications

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“…Existing investigations confirmed that blunting and mass loss of projectiles weaken the penetration efficiency of projectiles [4,7,[13][14][15][16][17], provided that impact velocities are less than the critical velocities. In this subsection, we analyze the influences of blunting and mass loss at hypervelocities, aiming to figure out the dominant mechanism of the decrease in DOP.…”

Section: Dominant Mechanism Of the Decrease In Dopmentioning

confidence: 95%

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: Dominant Mechanism Of the Decrease In Dopmentioning

confidence: 95%

Mass Loss and Penetration Depth of Hypervelocity Projectiles

Qiu

et al. 2021

Shock and Vibration

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“…The parameter S = 82.6fc −0.544 is fitted by test results [7]. (a) Crater stage: It is assumed that there is no mass loss in the crater stage of the mass erosion calculation model [18]. Because the accumulated plastic work during the crater stage is relatively little, the temperature rise of the projectile is not significant as well, so the temperature of the nose surface does not reach the metal melting temperature.…”

Section: Dynamic Mechanical Model In Penetration Processmentioning

confidence: 99%

“…, where ψ is the initial caliber-radius-head(CRH) of the projectile nose, defined as the ratio of the nose radius to the projectile diameter. According to the dynamic cavity expansion theory, considering the integral effect of penetration resistance on the projectile nose, the shape factor can also be defined as [24]: (a) Crater stage: It is assumed that there is no mass loss in the crater stage of the mass erosion calculation model [18]. Because the accumulated plastic work during the crater stage is relatively little, the temperature rise of the projectile is not significant as well, so the temperature of the nose surface does not reach the metal melting temperature.…”

Section: Dynamic Mechanical Model In Penetration Processmentioning

confidence: 99%

“…It should be noted that the surface of the nose is a special kind of metal with high temperature and high stress resistance that directly contacts the aggregate during the penetration process. In the present cutting model, it is assumed that the hardness of the projectile and aggregate is constant [17,18]. Because the aggregate particles are constantly updated on the surface of the nose in the penetration process, this assumption mentioned above will cause rare errors.…”

Section: Friction Cutting Considering Thermal Softening Of Materialsmentioning

confidence: 99%

“…Based on the erosion mechanism, He [16] and Li [17] successively carried out theoretical research on the model of erosion calculation and established a mass erosion calculation method combined with a high-speed friction theory and melting model. A coupling model of erosion calculation taking into account aggregate cutting and thermal melting was established by Ning [18], in which the accumulated friction energy was converted into thermal melting energy. Based on the assumption that the penetration is an adiabatic process, the mass loss is calculated by the receding of the nose surface.…”

Section: Introductionmentioning

confidence: 99%

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Study on Mass Erosion and Surface Temperature during High-Speed Penetration of Concrete by Projectile Considering Heat Conduction and Thermal Softening

Dong

Jiang

et al. 2023

Materials

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The mass erosion of the kinetic energy of projectiles penetrating concrete targets at high speed is an important reason for the reduction in penetration efficiency. The heat generation and heat conduction in the projectile are important parts of the theoretical calculation of mass loss. In this paper, theoretical models are established to calculate the mass erosion and heat conduction of projectile noses, including models of cutting, melting, the heat conduction of flash temperature, and the conversion of plastic work into heat. The friction cutting model is modified considering the heat softening of metal, and a model of non-adiabatic processes for the nose was established based on the heat conduction theory to calculate the surface temperature. The coupling numerical calculation of the erosion and heat conduction of the projectile nose shows that melting erosion is the main factor of mass loss at high-speed penetration, and the mass erosion ratio of melting and cutting is related to the initial velocity. Critical velocity without melting erosion and a constant ratio of melting and cutting erosion exists, and the critical velocities are closely related to the melting temperature. In the process of penetration, the thickness of the heat affected zone (HAZ) gradually increases, and the entire heat conduction zone (EHZ) is about 5~6 times the thickness of the HAZ.

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