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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Gas Gun"”.
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Performance of the UBC two-stage light-gas gun
The performance of UBC two-stage light-gas gun and the associated diagnostics systems were examined under a variety of shot conditions. In the gas gun, the expansion of gas from burning gun powder propels a piston which, in turn, compresses and accelerates the low molecular weight pump gas. The …
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An experimental study of the explosive welding window using a gas-gun
… allow this window to be fully explored a 63.5 mm gas gun has been designed and developed, as a simulation of explosive welding. The gun can fire a flyer plate at velocities up to 1 km/s using helium as the driving gas for the higher velocity and air for the lower velocity region. The driving …
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Development of a large-diameter gas gun for studies of gage validation and dynamic material properties
A large diameter gas gun has been developed which fires a 4-ft diameter, 3,200 lb projectile downward at velocities up to 230 ft/sec. The impact of the projectile onto geologic or other material specimens beneath the gun provides precise shock environments for shock physics studies, especially the …
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Impact damage evaluation of high performance polymeric composite material systems
… is presented in two parts. In Part I a nitrogen gas gun impact system developed at Virginia Polytechnic Institute and State University is described. Evaluation methods for impact damage resistance and impact damage tolerance as developed by K. T. Teh are presented as a basis for comparative …
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Time-resolved spectroscopic characterization of ballistic impact events in polymer and nanocomposite materials
… under ballistic shock loading conditions, a gas gun apparatus is necessary to generate appropriate high strain rate events. However, advances in high power ultra-fast laser amplifier systems have opened the possibility of optically generating ballistic shocks which are comparable to a shock …
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Study of advanced railgun hydrogen pellet injectors for fusion reactor refueling
An advanced railgun system has been developed to assess its feasibility as a hypervelocity hydrogen pellet injector for magnetically confined plasmas. It consists of a pellet generator/gas gun assembly for freezing hydrogen pellets and injecting them into the railgun at velocities as high as 1.5 …
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Experimental observations of aluminum particle combustion during hypervelocity water impact and penetration
… (10 mg - 20 mg) of Al particles using a light gas gun was developed to simulate conditions experi- enced by particulated shaped charge jet material during water penetration. In particle sizes tested (75 um - 5 um), only large particles at high velocities (75 um - 45 um at velocities greater …
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Finite strain behavior of polyurea for a wide range of strain rates
… rates (0.001/s to 10/s). Second, two distinct gas-gun split Hopkinson pressure bar [SHPB] systems are employed to cover high strain rates: a nylon bar system (700/s to 1200/s) and an aluminum bar system (2300/s to 3700/s). Lastly, the rate-sensitivity for intermediate strain rates (10/s to …
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Impact Mechanics of PMMA/PC Multi-Laminates with Soft Polymer Interlayers
… (PC) back layer. Instrumentation of the gas gun is achieved with a shock accelerometer measuring contact force and optical displacement sensors recording deflection. Previous impact research utilizing instrumented gas guns by Levy and Goldsmith, and Delfosse et al. have measured contact …
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Numerical modeling of unsteady compressible gas flow around a projectile
… to calculate the characteristics of compressible gas flow around a projectile during the motion of the projectile in the gun barrel is undertaken. The flow is considered axisymmetrical, nonstationary, nonisothermal, compressible, and turbulent. For calculating the compressible gas flow around a …
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Spectral studies of extra-terrestrial materials
… by shock on the spectra of rocks using a Light Gas Gun and Near Infrared spectroscopy with the goal of investigating the effects of weathering on the spectra of asteroids. It was found that there is a change in the spectra of the samples and a relationship with a change in composition of the …
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Finite Element Modeling of Ballistic Impact on a Glass Fiber Composite Armor
… of the panels was conducted using a compressed gas gun firing spherical steel projectiles oriented normal to the test panel surface. The V<sub>50</sub> ballistic limit of these panels was found to be approximately 560 m/s. Tuning parameters in the finite element models were adjusted to match the …
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Shock compression and dynamic fragmentation of geological materials
… series of plate impact experiments using a light gas gun. The experiments focused on the stress region of interest for blast mining, 0 to 12 GPa. The, fully dense, Lake Quarry Granite was found to have a constant shock speed, which agreed with the elastic longitudinal sound speed measured …
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Shock compression of water and solutions of ammonium nitrate
… An experimental facility, using a single stage gas gun in the ‘plate impact’ configuration, is described, along with associated experimental diagnostics. Measurements of, and improvements to, the tilt at impact are reported. The problem of shock temperature is discussed, including a brief review …
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The response of a structural target to oblique fragment and blast loading
… to a ball bearing propelled using a two-stage gas gun towards a Domex 700 steel target plate. The velocity of the ball bearing and the orientation angle of the target plate was varied. A numerical study was undertaken to further study oblique impact of a ball bearing on a Domex 700 target plate …
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Further experimental investigations of underwater reactive shaped charge liners and aluminum particle combustion during hypervelocity water impact and penetration
… by light emission. A series of 66 light gas gun tests were fired. The primary objective of these tests was to produce an equation for oxidation, an indicator of combustion, as a function of particle size and impact velocity as a supplement to shaped charge experiments. A test matrix …
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A study on the response of a target plate to a foreign object placed at various depths in a cylindrical Charge
… Impact tests were carried out using a two-stage gas gun to relate impact velocity to the deflection of the target plate. Tests were also carried out with explosive charges embedded with a ball bearing at varying depths to analyse the combined event. For all blast tests, the charge diameter was …
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The Mineralogy And Chemistry Of Micrometeorites
… Laboratory impact studies, using a light-gas-gun to accelerate small fragments (125- 250μm) of known meteorite mineralogies up to 5km/s, and then impact them into solar cells have generated a suite of residues that are analogues of those observed from LEO studies. The silicate minerals …
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The influence of cylindrical charge geometry on the velocity of blast-driven projectiles in one dimension
… impact experiments which was performed using a gas gun. The average velocity (between detonation and impact) was captured by tracking the time of detonation and impact. The time of impact was recorded through a Hopkinson Pressure Bar (HPB) behind the witness plate. Additionally, the total axial …
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Detection and characterization of impact damage in carbon fiber aircraft fuselage structure
… conducted on the panels using a high velocity gas gun with 2.4' diameter ice balls. The ice impact tests were performed in collaboration with the University of California San Diego (UCSD). In addition to the simulated hail impact testing, 2' diameter spherical tip steel impacts were conducted …
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