Numerical Analysis of Hypervelocity Solid-Solid Impacts by Means of Improved SPH Method Using New Particle Generation and Particle Reducing Techniques.

Shintate, Kyoji; Sekine, Hideki

doi:10.2322/jjsass.50.158

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…New particle generation and particle merger techniques [10][11][12] 2.5.1. New particle generation technique In the numerical simulation using a conventional SPH method, the loss of interactions among particles due to the increase of distances among the particles causes ''numerical fractures'', although the aforementioned fracture criterion is not satisfied.…”

Section: Equation Of Statementioning

confidence: 99%

“…In the numerical simulation of HVIs by means of a conventional SPH method, the loss of interactions among particles causes ''numerical fractures'' [9] when the distance between the particles increases. To prevent ''numerical fractures'', an improved SPH method with new particle generation and particle merger techniques was proposed by the authors [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A single energy-based parameter to assess protection capability of debris shields

Sekine¹,

Ito²,

Shintate³

2007

International Journal of Impact Engineering

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Section: Equation Of Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A single energy-based parameter to assess protection capability of debris shields

Sekine¹,

Ito²,

Shintate³

2007

International Journal of Impact Engineering

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Numerical Analysis of Hypervelocity Impacts of a Projectile on Laminated Metallic Plates by Means of Improved SPH Method.

Shintate¹,

Sekine²

2003

JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCE

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: This paper is concerned with the numerical analysis of the hypervelocity impacts (HVIs) of a projectile on laminated metallic plate targets. Laminated metallic plates have some potential advantages to increase ballistic resistance if the plates are optimally laid up. To analyze the HVI phenomena, a Smoothed Particle Hydrodynamics (SPH) method improved by using new particle generation and particle reducing techniques is applied, and a numerical lamination model for the SPH method is presented to introduce the discontinuity of stresses between the each layer of the laminated metallic plates. As examples, the numerical simulations are carried out for a steel or aluminum projectile striking to laminated aluminum plate targets with several different layup configurations. Through the numerical simulations, it is seen that the present method can describe the characteristics of the HVI phenomena of the projectile on the laminated metallic plate targets.

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Computational Efficiency Improvements in Cylindrical SPH Analysis of Hypervelocity Impacts

Ito¹

2008

JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCE

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Numerical simulations of solid-solid hypervelocity impacts (HVIs) using smoothed particle hydrodynamics (SPH) method in two-dimensional axisymmetric coordinates, are performed. It is known that Gaussian kernel is adequate for the SPH method in axisymmetric coordinates, however, Gaussian kernel is computationally less efficient because of its infinite range. We propose to adopt a simple function having only even-order terms as the kernel for the SPH method in axisymmetric coordintates, to improve the computational efficiency. The equations of conservation laws, the strain rate and rotation rate are formulated by using the quadric kernel and the quartic kernel. The HVIs are numerically simulated by using the quadric kernel, quartic kernel and Gaussian kernel for comparison. Each numerical result shows a good agreement with the experimental result, and the conservation of energy is assured for each calculation. Consequently, it is found that the quadric kernel and the quartic kernel have far better computational efficiency and comparable computational accuracy to Gaussian kernel.

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Numerical Analysis of Hypervelocity Solid-Solid Impacts by Means of Improved SPH Method Using New Particle Generation and Particle Reducing Techniques.

Cited by 3 publications

References 13 publications

A single energy-based parameter to assess protection capability of debris shields

A single energy-based parameter to assess protection capability of debris shields

Numerical Analysis of Hypervelocity Impacts of a Projectile on Laminated Metallic Plates by Means of Improved SPH Method.

Computational Efficiency Improvements in Cylindrical SPH Analysis of Hypervelocity Impacts

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