Optimal design of spaced plates under hypervelocity impact

Kim, Young-Hoon; Yoo, Jeonghoon; Lee, Minhyung

doi:10.1007/s12206-012-0327-5

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…As the total weight of the shield is reduced, the protection performance is getting worse in general. Therefore, the design problem becomes a Pareto optimal problem in which two design objectives conflict to each other [10,22]. The multi-objective optimization process was conducted by using the approximate functions of the plastic work and the areal density proportional from the result of the Design of experiment (DOE) and the Response surface method (RSM).…”

Section: Design Objective and Variablesmentioning

confidence: 99%

Optimal design of a composite space shield based on numerical simulations

2015

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In this study, optimal design of a stuffed Whipple shield is proposed by using numerical simulations and new penetration criterion. The target model was selected based on the shield model used in the Columbus module of the international space station. Because experimental results can be obtained only in the low velocity region below 7 km/s, it is required to derive the Ballistic limit curve (BLC) in the high velocity region above 7 km/s by numerical simulation. AUTODYN-2D, the commercial hydro-code package, was used to simulate the nonlinear transient analysis for the hypervelocity impact. The Smoothed particle hydrodynamics (SPH) method was applied to projectile and bumper modeling to represent the debris cloud generated after the impact. Numerical simulation model and selected material properties were validated through a quantitative comparison between numerical and experimental results. A new criterion to determine whether the penetration occurs or not is proposed from kinetic energy analysis by numerical simulation in the velocity region over 7 km/s. The parameter optimization process was performed to improve the protection ability at a specific condition through the Design of experiment (DOE) method and the Response surface methodology (RSM). The performance of the proposed optimal design was numerically verified.

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Section: Design Objective and Variablesmentioning

confidence: 99%

Optimal design of a composite space shield based on numerical simulations

2015

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“…Then, these parameters were used to calculate the interaction of the jet with the next plate. In other words, the penetration of a jet through spaced armor was processed as it penetrated each layer of the multilayer finite thickness target [7,8]. If the virtual origin of jet is (x a , t a ) and the entire jet is divided into n infinitesimal elements, then the velocity of i-th infinitesimal element is v i , and the velocity difference between the jet tip and tail is Dn i, The moment the jet reached the spaced armor is t i , the length of the jet infinitesimal element is l i, and DOP by the jet before the next i-th infinitesimal element is P i-1 .…”

Section: Theory Model Of Jet Penetrating Spaced Armormentioning

confidence: 99%

Spaced Armor Effects on Shaped Charge Jet Penetration

Liu

Huang

et al. 2014

Propellants Explo Pyrotec

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Spaced armor has a simple structure and is easily produced with low cost. Previous authors calculated how a jet penetrates spaced armor; but, this study provides both a theoretical calculation method describing the interaction of a jet with spaced armor and experimental data which agree well with the theoretical values. The effects of several factors were explored using LS‐DYNA such as the distance between the first plate and the second plate as well as layer thickness on the interaction between the jet and the target. A method for simulating the protection afforded by spaced armor and supporting the design of spaced armor is presented.

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“…To understand wound ballistics, many theoretical and experimental studies have been carried out [1][2][3][4][5][6][7][8]. However, it is still a difficult subject due to the chaotic behavior of highspeed impacts and the various rate-dependent material behaviors [9][10][11][12]. From a physical point of view, the most relevant and dominant parameters may be the velocity and deceleration of a projectile as the energy of a projectile is dissipated in terms of its dynamic energy, frature energy, thermal energy, and sound energy throughout a body caused by a very short impact time.…”

Section: Introductionmentioning

confidence: 99%

Investigation of bullet penetration in ballistic gelatin via finite element simulation and experiment

Yoon

Kim

et al. 2015

J Mech Sci Technol

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To qualitatively understand the deformation processes and damages in the human body caused by high-speed impact, we conducted experimental and computational investigations for bullet penetration into viscoelastic ballistic gelatin blocks. Because it is difficult to measure the strain rate-dependent material properties of viscoelastic gelatin blocks during high-speed impact, the material properties that are indirectly defined by the stress relaxation test were used for the computational simulation. We also conducted some firing experiments and analyzed the deformation processes of the structures. In particular, the passing through times and the shapes of the temporary and permanent cavities inside the ballistic gelatin blocks were analyzed and compared. This data reveals that the employed material models, with some modifications for the FE simulation, are sufficient for predicting the high-speed impact behaviors. To investigate the shapes of the permanent cavities and fragments made by bullets inside the gelatin blocks, two-dimensional sectional images were taken by an industrial CT scanner and a three-dimensional CAD model was constructed based on these images.

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Optimal design of spaced plates under hypervelocity impact

Cited by 14 publications

References 11 publications

Optimal design of a composite space shield based on numerical simulations

Optimal design of a composite space shield based on numerical simulations

Spaced Armor Effects on Shaped Charge Jet Penetration

Investigation of bullet penetration in ballistic gelatin via finite element simulation and experiment

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