Properties of ejecta generated at high-velocity perforation of thin bumpers made from different constructional materials

Shumikhin, T. A.; Myagkov, N. N.; Bezrukov, L. N.

doi:10.1016/j.ijimpeng.2012.06.008

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…1b), whose mass is much less than the mass of the ejecta in the case of an impact on continuous shield. This observation, made on the basis of calculations, is confirmed experimentally [22]. Secondly, the projectile fragmentation is characterized by forming jets ejected from the front part of the projectile along and across its movement direction ( Fig.…”

Section: Patterns Of Spherical Projectile Fragmentation On Thin Mesh supporting

confidence: 66%

Scaling Invariance and Characteristics of the Cloud of Spherical Projectile Fragmentation Products upon High-Velocity Impact on a Thin Mesh Shield

Myagkov¹

2018

J. Exp. Theor. Phys.

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In the present paper we consider the problem of the fragmentation of an aluminum projectile on a thin steel mesh shield at high-velocity impact in a three-dimensional (3D) setting. The numerical simulations are carried out by smoothed particle hydrodynamics method applied to the equations of mechanics of deformable solids. Quantitative characteristics of the projectile fragmentation are obtained by studying statistics of the cloud of fragments. The considerable attention is given to scaling laws accompanying the fragmentation of the projectile. Scaling is carried out using the parameter K which defines the number of the mesh cells falling within the projectile diameter. It is found that the dependence of the critical velocity V c of fragmentation on the parameter K consists of two branches that correspond to two modes of the projectile fragmentation associated with the "small" and "large" aperture of the mesh cell. We obtain the dependences of the critical velocity V c on the projectile diameter and the mesh parameters for the both modes of the fragmentation. It is shown that the average cumulative mass distributions constructed at V c exhibit the property of scale invariance, splitting into two groups of distributions exactly corresponding to the modes of the projectile fragmentation. In each group, the average cumulative distributions show good coincidence in the entire mass region, moreover in the intermediate mass region the each group of distributions has a power-law distribution with an exponent  different from that in the other group. The conclusion about the dependence of the exponent of the power-law distribution  on the fragmentation mode is made.Dynamic fragmentation of solids caused by impact or explosion has been studied for years . Typical experimental situations in which these phenomena take place correspond to collisions of heavy nuclei in atomic physics [3,4,19,20], collision of macroscopic bodies [1,12,16] (including projectile impact on a massive target [1,17,18,23,25]), shell fragmentation upon explosion [13], and projectile fragmentation upon high-velocity perforation of a thin shield [2, 5, 6, 8-11, 21, 22].A possible critical behavior during fragmentation was originally analyzed in the framework of a problem of nuclear collisions at moderate energies [3,4,19,20] using an approach based on the similarity of the observed distribution of fragments and that predicted by well-known theories of critical phenomena such as liquid-vapor transition and percolation. Later, these methods were applied to studying fragmentation in mechanical systems [8-10, 12-18, 24]. The existence of a critical transition from damage to fragmentation was confirmed for mechanical systems of various types both experimentally [14,15] and numerically [8-10, 11-13, 16-18].The transition from damage to fragmentation (or the degree of fracture) can be characterized in different ways, including the average fragment mass, mass of maximum fragment, fluctuations of the mass of largest fragment, etc. [3,4,12,13,19,20]. In syste...

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Section: Patterns Of Spherical Projectile Fragmentation On Thin Mesh supporting

confidence: 66%

Scaling Invariance and Characteristics of the Cloud of Spherical Projectile Fragmentation Products upon High-Velocity Impact on a Thin Mesh Shield

Myagkov¹

2018

J. Exp. Theor. Phys.

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“…Dynamic fragmentation of solids caused by impact has been studied for years. Typical experimental situations in which these phenomena take place correspond to collisions of heavy nuclei in atomic physics [1,2], collision of macroscopic bodies [3][4][5][6] (including projectile impact on a massive target), and projectile fragmentation upon high-velocity perforation of a thin shield [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Phenomena of dynamic fragmentation are widespread in nature. They occur, for example, in the collision of heavy nuclei in atomic physics [1,2], and the collision of macroscopic bodies [3][4][5][6][7][8][9] (including the impact of a striker on a thin or massive target).…”

Section: Introductionmentioning

confidence: 99%

Critical behavior for impact fragmentation of spherical solid bodies sensitive to strain rate

Myagkov¹

2021

J. Stat. Mech.

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In the present paper, we consider the high-velocity impact fragmentation of two spherical solid bodies sensitive to strain rate in a three-dimensional (3D) setting. We use both dimensional analysis and numerical simulations by SPH method to shed light on this problem. The key point of the work is the assumption of complete self-similarity of the problem under consideration with respect to the effective strain rate parameter eff  , which is verified by numerical simulations. As a result we consider the two cases corresponding to the high-velocity 1  eff  and low-velocity 1  eff  loading. The size of the system is characterized by the total number of the SPH particles tot N approximating the each sphere. It is shown that for the finite tot N the critical velocity of fragmentation at high-velocity loading exceeds that at low-velocity loading, i.e. 0 c c V V   . For   tot N the critical fragmentation velocities become the same.

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Section: Introductionmentioning

confidence: 99%

On critical exponents for impact fragmentation of spherical solids

Myagkov

2019

Physica A: Statistical Mechanics and its Applications

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Properties of ejecta generated at high-velocity perforation of thin bumpers made from different constructional materials

Cited by 11 publications

References 11 publications

Scaling Invariance and Characteristics of the Cloud of Spherical Projectile Fragmentation Products upon High-Velocity Impact on a Thin Mesh Shield

Scaling Invariance and Characteristics of the Cloud of Spherical Projectile Fragmentation Products upon High-Velocity Impact on a Thin Mesh Shield

Critical behavior for impact fragmentation of spherical solid bodies sensitive to strain rate

On critical exponents for impact fragmentation of spherical solids

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