Global ETD Search
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 14 of 14 for “"shock physics"”.
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Shock Physics in Compressible Solids
This dissertation explores the physics of compressive and tensile shock waves in compressible solids, focusing on thermoelastic (TE) and thermoviscoelastic (TVE) materials with and without rheology. Shock phenomena in compressible solids are inherently complex, involving nonlinear wave …
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Shock Physics of Non-Ideal Detonations for Energetic Explosives With Aluminum Particles
… of the reaction zone, and produce a secondary shock wave which never reaches the detonation wave front. Additionally, under certain combinations of heat transfer rate and chemical release rate, the measured behavior can be reproduced, and the model results indicate that these phenomena have a …
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Development of a large-diameter gas gun for studies of gage validation and dynamic material properties
… specimens beneath the gun provides precise shock environments for shock physics studies, especially the evaluation and validation of ground-motion instruments, and the development of dynamic material properties data for large specimens. This thesis describes the operating principle of the …
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Small-scale structures in planetary nebulae
… and its excitation properties used as a probe of shock physics. Previous studies of several planetary nebulae have indicated a relationship between molecular hydrogen and cometary knots as a shielding mechanism allowing for continued survival and formation of the molecule. Our first PN studied, …
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Weakly collisional electrostatic simulations for laboratory astrophysics applications
Modern plasma physics research is increasingly realizing the potential for cutting edge laser-produced plasma experiments to be exploited in order to investigate astrophysically relevant phenomena. Of particular interest are collisionless shocks, and the physics of the weakly collisional regime …
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Numerical modeling of unsteady compressible gas flow around a projectile
… calculations is in support of the Joint Actinide Shock Physics Experimental Research (JASPER). The JASPER facility utilizes a two-stage light gas gun to conduct equation of state experiments. The gun has a launch tube bore diameter of 28 mm, and is capable of launching projectiles at a velocity of …
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Investigating detonation fronts in small explosive charges using a wave shaper
… account for these phenomena was also explored. Shock physics, modeling, and experiments using high speed imaging are combined to better understand the function of a wave shaper and its effect on detonation front curvature. The wave shaper shifts the detonation front from its characteristic …
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Particle-in-cell simulations of perpendicular supernova shock fronts
… particles is found within the field of shock physics as diffusive shock acceleration. To allow particles to enter this process also known as Fermi acceleration pre-acceleration processes like shock surfing acceleration and shock drift acceleration are necessary. Investigating the …
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The Early Evolution of Terrestrial Planets: Impact Simulations and Planetary Chemistry
… we perform impact simulations using the shock physics code, iSALE, with the primary purpose of determining where impactor metal accretes to within the planet, or indeed escapes the planet altogether. The inclusion of material strength is vital in the ability of these simulations to …
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Analysis and simulation of small scale microwave interferometer experiments on non-ideal explosives
… interferometer to measure the instantaneous shock and failing detonation wave velocities in explosives. Only those explosives which are transparent to the microwave radiation are evaluated, including ammonium nitrate plus fuel oil (ANFO). It is shown here for the first time that the small …
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High Strain Rate Properties of Geological Materials
The dynamic response of various geological materials has been investigated through a series of plate impact experiments. The materials involved were supplied from various mines by De Beers and Rio Tinto and were generically termed: sandstone, scilified siltstone, kimberlite, quartz/feldspathic …
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Shock compressing liquids on a tabletop microscope, with special focus on detonating nitromethane
In this dissertation the shock compression of liquid nitromethane (NM), one of the simplest homogeneous condensed-phase explosives, is explored using a tabletop microscope. The shock is produced using a spatially homogenized laser to launch flyer plates, 0.5 mm diameter, 18 – 37 µm thick disks of …
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Investigations of Hypervelocity Impact Physics
… Such hypervelocity impacts (HVI) create immense shock pressures and can melt or vaporize aerospace materials, even inducing brief plasmas at higher speeds. Sacrificial shields have been developed to protect critical components from damage under these conditions, but the response of many materials …
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Numerical Modeling of Blast-Induced Liquefaction
… under multiple and consecutive high-magnitude shock environments similar to those produced by large earthquakes. The simulation procedure involved the modeling of a three-dimensional half-space soil region with pre-defined, embedded, and strategically located explosive charges to be detonated …