Techniques to Launch Projectile Plates to Very High Velocities

Chhabildas, L.C.; Knudson, Marcus D.

doi:10.1007/3-540-27168-6_4

Cited by 14 publications

(10 citation statements)

References 56 publications

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“…In general, gas gun experiments produce high pressure and temperature states during the projectile-target interaction and shockwaves generated during such an impact event are similar to those found in micro-meteoritic collisions with spacecraft [1]. Projectile and target materials both experience severe localized deformation under these conditions, which creates stretching, bending, and complete perforation in thin target plates.…”

Section: Introductionmentioning

confidence: 94%

Modeling Plastic Deformation of Steel Plates in Hypervelocity Impact Experiments

O’Toole

Trabia

Hixson

et al. 2015

Procedia Engineering

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Hypervelocity impact experiments were done with a two-stage light gas gun to study the plastic deformation of metallic plates. Cylindrical Lexan projectiles were fired at A36 steel target plates with a velocity range of 4.5-6.0 km/s. Experiments were designed to produce a front side impact crater and a permanent bulging deformation on the back surface of the target while preventing complete perforation. Free surface velocities from the back surface of target plate were acquired using the newly developed Multiplexed Photonic Doppler Velocimetry (MPDV) system. Two different computational techniques were developed to simulate this type of experiment: Lagrangian-based smooth particle hydrodynamics (SPH) in LS-DYNA and the Eulerianbased hydrocode CTH. Parameters for material models including equation of state, compressive strength, and spall model were selected to obtain highest fidelity numerical results to compare with experiment.

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Section: Introductionmentioning

confidence: 94%

Modeling Plastic Deformation of Steel Plates in Hypervelocity Impact Experiments

O’Toole

Trabia

Hixson

et al. 2015

Procedia Engineering

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“…Both the LS-DYNA SPH and the CTH computer codes used the Johnson-Cook material model [10] for both the Lexan projectile and A36 steel plate. In the Johnson-Cook material model of plasticity, flow stress is expressed as = ( + ( ) ) (1 + ln ( ⋅ * )) (1 − ( * ) ) , (1) where is the flow stress; , , , , and were material constants;…”

Section: Materials Modelmentioning

confidence: 99%

“…Consequently, researchers have been studying various aspects of this problem for several decades. A common technique to study hypervelocity impact in laboratory settings is the two-stage light-gas gun [1,2], which can accelerate a projectile to generate shock waves in a target similar to those created by detonating high explosives or meteorite collisions [3]. Swift [4] discussed the historical development of this type of gun.…”

Section: Introductionmentioning

confidence: 99%

Study of Hypervelocity Projectile Impact on Thick Metal Plates

Roy

Trabia

O’Toole

et al. 2016

Shock and Vibration

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Hypervelocity impacts generate extreme pressure and shock waves in impacted targets that undergo severe localized deformation within a few microseconds. These impact experiments pose unique challenges in terms of obtaining accurate measurements. Similarly, simulating these experiments is not straightforward. This study proposed an approach to experimentally measure the velocity of the back surface of an A36 steel plate impacted by a projectile. All experiments used a combination of a two-stage light-gas gun and the photonic Doppler velocimetry (PDV) technique. The experimental data were used to benchmark and verify computational studies. Two different finite-element methods were used to simulate the experiments: Lagrangian-based smooth particle hydrodynamics (SPH) and Eulerian-based hydrocode. Both codes used the Johnson-Cook material model and the Mie-Grüneisen equation of state. Experiments and simulations were compared based on the physical damage area and the back surface velocity. The results of this study showed that the proposed simulation approaches could be used to reduce the need for expensive experiments.

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“…In these studies, time resolved histories of the prompt impact flash, and the resultant late time characteristics from the radiating impact ejecta were investigated. For these studies, they used the STAR large bore two-stage light gas gun to accelerate projectiles [8], and sometimes third-stage flier [9][10][11] plates to velocities ranging from 5 to 19 km/s, and they recorded impact flash signatures using commercially photo-diodes of silicon, germanium, and indium gallium arsenide (In-GaAs). The photo-diode diagnostics were fielded on experiments in which target and projectile material were limited to titanium plates impacting aluminum for impact surface temperature measurements for prompt light flash radiation.…”

Section: Introductionmentioning

confidence: 99%

Characterization of light flash signatures using optical-fiber pyrometer detectors during hypervelocity impact

Tang

Shi

Zhang

et al. 2015

International Journal of Applied Electromagnetics and Mechanics

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Impact light flash is an intense light flash released when a target is impacted by a hypervelocity projectile. Light flash is caused by emissions from a jet of shocked material which is thrown from the impact site. Impact light flash phenomenology is now being considered for applications where remote diagnostics are required to observe and diagnose impacts on satellites and spacecraft. Additionally, this phenomena and remote diagnostics are under consideration for deep space exploration and missile defense applications. Currently, optical signatures created from hypervelocity impact can be utilized as the basis for detectors (spectrometers, pyrometers), which characterize the material composition and temperature. To establish this capability technically in the laboratory, we have conducted a series of experiments on a two-stage light gas gun at impact velocities ranging from 1.96 to 4.21 km/s. The focus of this work is to develop a flash signatures collected methods for use as a reliable light flash, and late time radiating evolution to characterize material behavior in the shocked and expanding state; ascertain scaling of light flash with impact velocity, and determine the temperature of the impact flash resulting from radiating emissions when photomultiplier tube (PMT) are used in conjunction with narrow band pass filtering at specific wavelengths as a pyrometer. The results of these experiments are discussed in detail using natural dolomite target.

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Techniques to Launch Projectile Plates to Very High Velocities

Cited by 14 publications

References 56 publications

Modeling Plastic Deformation of Steel Plates in Hypervelocity Impact Experiments

Modeling Plastic Deformation of Steel Plates in Hypervelocity Impact Experiments

Study of Hypervelocity Projectile Impact on Thick Metal Plates

Characterization of light flash signatures using optical-fiber pyrometer detectors during hypervelocity impact

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