In munitions technologies, hazard investigations for explosive (or more generally energetic
material) including systems is a very important issue to achieve insensitivity. Determining the
response of energetic materials to different types of mechanical or thermal threats has vital
importance to achieve an effective and safe munitions design and since 1970&rsquo / s, lots of studies
have been performed in this research field to simulate the dynamic response of energetic
materials under some circumstances.
The testing for hazard investigations is a very expensive and dangerous topic in munitions
design studies. Therefore, especially in conceptual design phase, the numerical simulation
tools for hazard investigations has been used by ballistic researchers since 1970s. The main
modeling approach in such simulation tools is the numerical simulation of deflagration-todetonation
transition (DDT) phenomenon. By this motivation, in this thesis study, the numerical
simulation of DDT phenomenon in solid energetic materials which occurs under some
mechanical effects is performed. One dimensional and two dimensional solvers are developed
by using some well-known models defined in open literature for HMX (C4 H8 N8 O8) with 73
% particle load which is a typical granular, energetic, solid, explosive ingredient. These models include the two-phase conservation equations coupled with the combustion, interphase
drag interaction, interphase heat transfer interaction and compaction source terms. In the
developed solvers, the governing partial differential equation (PDE) system is solved by employing
high-order central differences for time and spatial integration. The two-dimensional
solver is developed by extending the complete two-phase model of the one-dimensional solver
without any reductions in momentum and energy conservation equations.
In one dimensional calculations, compaction, ignition, deflagration and transition to detonation
characteristics are investigated and, a good agreement is achieved with the open literature.
In two dimensional calculations, effect of blunt and sharp-nosed projectile impact situations
on compaction and ignition characteristics of a typical explosive bed is investigated. A minimum
impact velocity under which ignition in the domain fails is sought. Then the developed
solver is tested with a special wave-shaper problem and the results are in a good agreement
with those of a commercial software.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12611756/index.pdf |
| Date | 01 March 2010 |
| Creators | Narin, Bekir |
| Contributors | Ozyoruk, Yusuf |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Ph.D. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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