Modeling on mass abrasion of kinetic energy penetrator

Chen, X.W.; He, Lingbing; Yang, Sha

doi:10.1016/j.euromechsol.2009.07.006

Cited by 40 publications

(35 citation statements)

References 10 publications

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“…Chen et al [6] confirmed that the mass abrasion of projectile was significantly influenced by the initial impact velocity and the hardness of aggregates. The other factors, such as the strength and density of concrete, the size of aggregates, and the geometry of projectile, play a limited influence on the mass abrasion of projectile.…”

Section: Introductionmentioning

confidence: 66%

“…The other factors, such as the strength and density of concrete, the size of aggregates, and the geometry of projectile, play a limited influence on the mass abrasion of projectile. Meanwhile, he also proposed that the influence of the strength of projectile on mass loss would be more important than the hardness of aggregates Figure 1 with accounting for the effect of aggregates [6].…”

Section: Introductionmentioning

confidence: 99%

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Projectile Nose Mass Abrasion of High-Speed Penetration into Concrete

Qian

Huang

et al. 2012

Advances in Mechanical Engineering

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Based on the dynamic spherical cavity expansion theory of concrete and the analysis of experimental data, a mass abrasion model of projectile considering the hardness of aggregates, the relative strength of target and projectile, and the initial impact velocity is constructed in this paper. Furthermore, the effect of mass abrasion on the penetration depth of projectile and the influence of hardness of aggregates and strength of projectile on penetration depth and mass loss are also analyzed. The results show that, for the ogive-nose projectile with the CRH of 3 and aspect ratio of 7 penetrating the concrete of 35 MPa, the "rigid-body penetration" model is available when the initial impact velocity is lower than 800 m/s. However, when the initial impact velocity is higher than 800 m/s, the "deforming/eroding body penetration" model should be adopted. Through theoretical analysis and numerical calculation, the results indicate that the initial impact velocity is the most important factor of mass abrasion. The hardness of aggregates and the strength of projectile are also significant factors. But relatively speaking, the sensitivity of strength of projectile to mass abrasion is higher, which indicates that the effect of projectile material on mass abrasion is more dramatic than the hardness of aggregates.

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Section: Introductionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Projectile Nose Mass Abrasion of High-Speed Penetration into Concrete

Qian

Huang

et al. 2012

Advances in Mechanical Engineering

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“…During high speed penetration, the ratio of inertia resistance increases, and the effect of volume fraction of the coarse aggregate on penetration depth decreases. For a higher penetration speed, the projectile head will be eroded, and the hardness of coarse aggregate has a significant effect on the abrasion of the projectile head (Chen et al, 2010), which is beyond the scope of the theory in this paper and needs further study. …”

Section: Model Verification and Analysismentioning

confidence: 96%

Study of the anti-penetration performance of concrete with different coarse aggregate content

Wu¹,

Li²,

Shen³

2018

Lat. Am. j. solids struct.

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Deep penetration experiments were performed on five types of concrete with different coarse aggregate content. The projectile diameter was 29.9 mm, the initial velocity was 647 m/s, and the volume fraction of the coarse aggregate was between 0% and 59.0%. The damage laws and damage mechanism of the target were analyzed. The pure mortar target had the smallest radial crack origin diameter and crater depth. Too high of the coarse aggregate content led to the formation of many voids, which led to the disappearance of radial cracks, crater surface bypassing the coarse aggregate and a large reduction of crater diameter. The influence laws and mechanism of the coarse aggregate on the penetration depth were also analyzed. The increase of volume fraction of coarse aggregate was beneficial to reducing penetration depth and the increase of voids volume fraction was opposite. The penetration depth was the lowest when the volume fraction of the coarse aggregate reached the maximum and no voids formed. By modifying the static resistance stress in the Forrestal penetration formula, a penetration depth model considering the volume fractions of the coarse aggregate and voids was established. The predicted results were in good agreement with the experimental results.

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“…The mass abrasion is closely related to the structural design and optimization of high-speed KE penetrators, and thus has become an important topic among the international research communities. In order to understand the mechanism of mass abrasion of penetrator, a large amount of papers published recently, including experimental studies [1][2][3][4] and empirical predictions as well as theoretical analyses [5][6][7][8][9][10][11][12][13][14][15]. In general, a common shortcoming exists in all these empirical predictions and theoretical analyses, i.e., all the formulae came from fitting the independent experimental results and could only partially explain the mechanism of mass abrasion.…”

Section: Introductionmentioning

confidence: 99%

Parametric study on mass loss of penetrators

Chen

2010

Acta Mech Sin

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Earth penetration weapon (EPW) is applicable for attacking underground targets protected by reinforced concrete and rocks. With increasing impact velocity, the mass loss/abrasion of penetrator increases, which significantly decreases the penetration efficiency due to the change of nose shape. The abrasion may induce instability of the penetrator, and lead to failure of its structure. A common disadvantage, i.e. dependence on corresponding experimental results, exists in all the available formulae, which limits their ranges of application in estimating the mass loss of penetrator. In this paper, we conduct a parametric study on the mass loss of penetrator, and indicate that the mass loss of penetrator can be determined by seven variables, i.e., the initial impact velocity, initial nose shape, melting heat, shank diameter of projectile and density and strength of target as well as the aggregate hardness of target. Further discussion on factors dominant in the mass abrasion of penetrator are given, which may be helpful for optimizing the target or the projectile for defensive or offensive objectives, respectively.Keywords Penetrator · Mass loss · Depth of penetration · Parametric study List of symbolsA surface area of projectile nose (m 2 ) b length of projectile nose (m) C proportional coefficient of mass loss to initial kinetic energy of projectile (s 2 m −2 ) C p specific heat at constant pressure (J (kg K) −1 ) d shank diameter of projectile (m) f friction force per unit area (Pa) f c unconstrained compressive strength of concrete target (Pa) F n instant axial drag force on projectile nose (N) H Moh's hardness of aggregate H 0 reference value of Moh's hardness of aggregate k mechanical equivalent of heat (J cal −1 ) m instant mass of projectile (kg) M 0 initial mass of projectile (kg) M f mass of residual projectile (kg) N * instant nose factor of projectile N * 0 initial nose factor of projectile N * 1 and N * 2 dimensionless constant related to nose geometry p pressure on projectile nose (Pa) Q melting heat for unit mass of projectile (cal) R c Rockwell hardness S empirical constant for concrete target and related to f c t time (s) T Kelvin temperature (K) v instant penetration velocity (m s −1 ) 123 586 L. He et al. V s initial impact velocity of projectile (m s −1 ) w t friction work (J) z instant DOP of projectile (m) Z ultimate DOP of projectile (m) χ constant defined in Ref. [23] (kg m −3 )

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Modeling on mass abrasion of kinetic energy penetrator

Cited by 40 publications

References 10 publications

Projectile Nose Mass Abrasion of High-Speed Penetration into Concrete

Projectile Nose Mass Abrasion of High-Speed Penetration into Concrete

Study of the anti-penetration performance of concrete with different coarse aggregate content

Parametric study on mass loss of penetrators

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