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Showing 1 to 20 of 244 for “"Explosives"”.
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On Detonation Diffraction in Condensed-Phase Explosives
A recently proposed higher order theory including shock acceleration effects for detonation shock dynamics (DSD) is evaluated for PBX-9502. Comparisons of detonation diffraction in PBX-9502 are made between experiment, multi-material simulations using the calibrated equation of state and reaction …
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Detonation modelling of non-ideal high explosives
High explosives (HE) are used in many fields where the energy liberated by the combustion process is used to perform useful work. High explosives normally burn via a detonation; a supersonic wave consisting of a shock wave coupled to chemical energy release. Detonations in conventional HE (CHE) …
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Shock initiation of explosives under the microscope
… explores the shock compression of solid state explosives by thin, laser-driven flyer plates. These flyer plates consist of aluminum foils, typically 25 – 75 μm thick, which are launched using a Nd:YAG laser with a 20 ns pulse width in a technique developed within the Dlott group. A full …
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Vibrational energy transfer in condensed high explosives: Nitromethane
Molecular mechanical energy transfer in energetical materials is investigated because of the likely possibility of a relationship between energy transfer rates and impact sensitivities. Picosecond coherent Raman scattering, and anti-Stokes Raman spectroscopy following an ultrafast temperature and …
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Improving Detection and Identification Methods for Volatile Organic Explosives
… and tested for portability and detection of explosives, to date no method has solved the simultaneous issue of speed, reliability, selectivity and sensitivity. In order to advance the chemical and biological detection of explosives as screening tools in search areas, it is necessary to …
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Detonation shock and ignition dynamics in condensed phase explosives
… dynamics of detonation waves in condensed phase explosives using direct numerical simulations and asymptotic analysis. We develop a model to simulate deflagration to detonation transition in pentaerythritol tetranitrate powders. The model uses a continuum mechanics formulation of conservation …
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Functionalized silicone composites: omniphobic coatings, microspheres and plastic explosives
… series of experiments on silicone-based plastic explosives. There is a paucity of literature regarding the controlled shock impact and subsequent detonation of commonly used explosives. What reports exist rely on computer-modelling and idealized assumptions to make conclusions about the …
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An experimental evaluation of explosives in blasting limestone and granite
… was the evaluation of military and commercial explosives. A standardized index of effectiveness was used as the basis of comparison.</p> <p>Testing was conducted at the Experimental Mine of Missouri School of Mines and Metallurgy at Rolla, Missouri, and at Graniteville, Missouri. At the school …
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Standoff Laser Interferometric Photoacoustic Spectroscopy for the Detection of Explosives
There will unfortunately always be a pressing need to detect and identify explosive materials. Performing detection at a standoff distance is much safer and this is the impetus for this work. Photoacoustic spectroscopy is well suited to the task of explosive detection at a standoff distance. A …
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The Advanced Spectroscopic Analysis of Organic Gunshot Residue and Explosives
… and interpret the presence of gunshot residue or explosives material. This concern is seen in law enforcement agencies and the media throughout the United States and abroad.</p> <p>Currently, the typical method of analyzing gunshot residue in most crime laboratories serves to identify the …
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On the calibration of some ideal and non-ideal explosives
… aspects. Finally the calibrations of various explosives are presented. It is through these materials that the effectiveness of the models is determined, as it is required that the models reproduce well the experimental data. Many of these experimental characteristics that were measured in the …
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Numerical Modelling of Detonation and Ignition of Condensed Phase Explosives
… good understanding of the physical properties of explosives is essential for their safe and efficient usage. Numerical simulations have proven to be an excellent tool with which to develop and verify models which describe both ignition and detonation of explosives. The objective of this work is to …
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Intense laser matter interactions for explosives detection and tunable spectral blueshift
This dissertation investigates explosives detection and spectral shifts induced in metal surfaces by ultrafast laser pulses at intensities ranging from 1013 to 1014 W/cm2. These ~100 femtosecond (fs) pulses facilitate non-resonant vaporization of explosives, enabling non-contact sampling and …
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The Detection and Identification of Explosives by Canines and Chemical Instrumentation
… since 2016, the detection and identification of explosives remains of pertinent interest to law enforcement agencies. This work presents two soon-to-be published research articles that focus on the detection and identification of explosives by both chemical instrumentation and canines. The first …
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Effects of Tomographic Image Reconstruction Parameters on Explosives Detection System Performance
Made available in DSpace on 2017-07-06T18:48:43Z (GMT). No. of bitstreams: 3 Humm_Paul_G_MS.pdf: 34070228 bytes, checksum: 084e7a2e24c30d8b43aa4516cb3ee7ab (MD5) Humm_Paul_G_MS_ABS.pdf: 527604 bytes, checksum: cbb92c87a7fda510847333f867d45322 (MD5) license.txt: 4813 bytes, checksum: …
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Hybrid shock dynamics models for heterogeneous explosives with embedded inert material
Made available in DSpace on 2016-03-02T20:24:08Z (GMT). No. of bitstreams: 3 LIEBERTHAL-DISSERTATION-2015.pdf: 17117421 bytes, checksum: cb0ad1c58510ca4b9b8e5a82e10486cc (MD5) Source Files.zip: 139575060 bytes, checksum: c8d25ed5b074095dc473e31bf00b8a2c (MD5) LICENSE.txt: 4215 bytes, checksum: …
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Enhanced combined effects in aluminized explosives by an innovative initiation system
… is focused towards the use of aluminized explosives because of their blast potential and the degree of possible power amplification. In addition to strong bases of technical support, this study provides a plan for experimental demonstration and recommendations for addressing technology …
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Multiphase extensions to ODE models for detonations of non-ideal explosives
… better capture the heterogeneities in non-ideal explosives used in mining applications. Streamline ODE multidimensional models are normally obtained by reducing the partial differential equations (PDEs) describing the motion of the material to ODEs by making approximations about some of the …
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Shock Physics of Non-Ideal Detonations for Energetic Explosives With Aluminum Particles
Results indicate that the induction delay for the aluminum particles, combined with endothermic processes, alter the structure 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 …
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Tracking hot spot dynamics in solid state explosives with shock compression microscopy
… investigating the shock initiation of explosives is difficult because of the violence and speed at which explosive processes occur. This dissertation systematically investigates the initiation behavior of solid-state explosives when subjected to shock compression using experimental …
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