Physical vapor deposition is a method used to deposit films of pentaerythritol tetranitrate (PETN) with great control over microstructure. As a result of depositing high density PETN films, microcracking in the films frequently occurs. PETN detonation testing was conducted to determine the effect these microcracks have on detonation. To explore this, two films were separated by controlled gaps to simulate cracks in films. The detonation was initiated at the beginning of a film, and refractive imaging was used to determine whether the detonation successfully propagated across the gap. Films of various thicknesses were evaluated to determine the maximum gap width that would result in detonation propagation at a specified PETN film thicknesses.
The tests were also simulated with CTH. Computer generated schlieren (CGS) images were developed to provide a comparable evaluation to the experiments. With minimal effort in adjusting equation of state parameters, the CGS images were able to resemble the refractive images obtained from experimentation.
|Advisor:||Hargather, Michael J.|
|Commitee:||Forrest, Eric C., Lim, Seokbin|
|School:||New Mexico Institute of Mining and Technology|
|School Location:||United States -- New Mexico|
|Source:||MAI 81/2(E), Masters Abstracts International|
|Subjects:||Mechanical engineering, Physics|
|Keywords:||CTH, Detonation, Explosive, PETN, Schlieren, Shadowgraph|
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