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 20 of 29 for “"Energetic material"”.
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A numerical study of shock-induced hot spot generation in energetic material
This thesis studies the formation of hot spots in energetic materials by shock initiation. A mathematical model has been developed based on viscoplastic pore collapse mechanics. Governing equations for the condensed-phase and gas-phase dynamics are derived which contain important processes …
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Spectroscopic Measurements of the Combustion of Aluminum and Aluminum-Based Energetic Material Particles Using a Heterogeneous Shock Tube
… component of propellants, explosives, and energetic materials due to the high energy release associated with its oxidation. Considerable research has been done on aluminum combustion, but questions remain about the behavior of aluminum particles, particularly at small particle sizes where …
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Microwave enhancement of energetic materials combustion through gas-phase flame interactions
<p>Traditionally, energetic materials’ energy output has been limited to being controlled via formulations and, once an energetic material is manufactured, dynamic change of energy output during combustion is difficult. These limitations are specific to all types of energetic materials, including …
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Computational Investigation of Strain and Damage Sensing in Carbon Nanotube Reinforced Nanocomposites with Descriptive Statistical Analysis
… explosives (PBXs) are composites comprised of energetic crystals with a very high energy density surrounded by a polymer binder. The formation of hotspots within polymer bonded explosives can lead to the thermal decomposition and initiation of the energetic material. A frictional heating model …
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The Formation of Distal Impact Ejecta
… first model focuses on the most highly shocked material that forms a massive expanding vapor plume or fireball. In this model molten droplets or spherules condense from the vapor. We model the expanding vapor plume using a one dimensional Lagrangian hydrocode. The condensation of droplets is …
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Combustion Physics and Inverse Modeling of Energetic Materials
Energetic material combustion involves intricate multi-scale and multi-phase dynamics, where the interplay of chemical reaction and transport processes results in complex wave patterns across a wide range of length scales from nano to millimeter. Our limited fundamental understanding of these …
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Compressive Behavior of Simulated Explosive-Filled Composites
Historically, adhesion research related to energetic materials has been focused on examining the interaction between explosive crystals and the substrate of interest. However, this neglects the effects of the binder material in compounds such as Composition C-4. These types of explosives are …
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Continuous flow separation techniques for microchemical synthesis
… microfluidic mixers for kinetic studies of energetic material synthesis. Dielectrophoresis was used to study the continuous separation of polystyrene particles based on size. Essentially, a microfluidic particle "ratchet" was created using a soft-lithography microchannel and slanted …
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Improving reactivity of aluminum-based structural energetic materials
… improve reactivity in aluminum based structural energetic materials. This will be done by testing different alloy structures and various material inserts in structured explosive experiments. This study will also utilize heavy end confinement for all tests while also taking multiple pressure …
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STRUCTURE AND PROPERTIES OF NOVEL ENERGETIC COORDINATION COMPLEXES AND THEIR POTENTIAL AS MAGNETICALLY SWITCHABLE EXPLOSIVES
In the field of energetics, much effort is focused on the development of safe, high performance energetic materials for use in military and civilian sectors. An effective explosive must possess good energetic properties such as high energy density, detonation velocity, and detonation pressure. Such …
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Development and analysis of aluminum-PTFE reactive composite material
… a replacement to aluminum. Aluminum Teflon based energetic material see great potential for use in pyrotechnics, propellants and even explosives. A composite with composition Al-PTFE (90-10 wt. %) is prepared through Cryomilling and is shown to be a better method of preparation as compared to room …
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New technologies for spectroscopy of materials under static and shock compression
… novel techniques for spectroscopically studying materials under static and shock compression are described. The first known spectra of self-assembled organic monolayers under static pressure up to 10 GPa were obtained by the novel combination of surface-enhanced Raman scattering spectroscopy with …
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Custom engineered nanomaterials for energetics and energy applications
Recent interest in reactive material has shifted to more custom formulations targeting specific applications. In this work, preparation and characterization of nanomaterials used for several energetics and energy applications are addressed. The main challenge of this effort is to design and prepare …
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Explosive initiation of various forms of the Ti/2B energetic system
… the weapon’s blast effects. Metal-based reactive materials (RM) are of interest because they will allow weapons to be tailored to suit certain applications. The combination of titanium and boron is a prime example of such a reactive material. The high temperatures and persistent fireball generated …
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High pressure surface enhanced Raman scattering spectroscopy
… for self-assembled monolayers (SAMs) of the energetic material simulant 4-nitrobenzenethiol (NBT). A large pressure-broadening NO2 symmetrical stretch was found in the SAMs but not in solid NBT. Single-molecule Raman spectra were studied at high pressures (1-4 GPa). The molecules were two …
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Heat Transfer and Combustion Characteristics of Nano-Sized Aluminum and Aluminum Oxide Utilizing Advanced Laser and Optical Diagnostics
… the study utilizes Laser-induced Air Shock from Energetic Material (LASEM) to assess the energetic behavior of nano-aluminum. LASEM is employed to measure and compare the shockwave velocity generated by laser-induced combustion of both nano-aluminum and nano-alumina particles. The observed …
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Investigating Energetic Porous Silicon as a Solid Propellant Micro-Thruster
Energetic porous silicon has emerged as a novel on-chip energetic material capable of generating thrust that can be harnessed for positioning of millimeter and micron-scale mobile platforms such as microrobots and nano-satellites. Porous silicon becomes reactive when nano-scale pores are infused …
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High temperature spectroscopic measurements of aluminum combustion in a heterogeneous shock tube
Aluminum is an important energetic material that burns with a variety of oxidizers with a high reaction enthalpy. It is a top performer for energy density if oxidizer mass is considered as well as the fuel. Because of this, it is often used as an energetic additive in anaerobic conditions because …
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Formation of RDX nanoparticles by rapid expansion of supercritical solution : in situ characterization by laser scattering
… (RDX), a well-known energetic material, is highly explosive. Reduction of the sensitivity of RDX is desired for safe handling and storage in military applications. Data on the sensitivity of RDX in the 10-1000 um crystal size range suggested that the impact sensitivity …
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