Analysis of Shock to Detonation Transition (SDT) of Porous High Energy Propellant from Ramp-Wave Compression Loading PDF Download
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Author: H. Krier
Publisher:
ISBN:
Category :
Languages : en
Pages : 121
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Book Description
Increasing the nitramine content of solid rocket propellants increases the overall performance of the system as well as the sensitivity to detonation by shock initiation. In some instances a confined zone of granulated propellant adjacent to a zone of cast propellant can provide a rapid enough pressure-rise rate ot shock initiate the cast material. If the cast propellant is porous, the detonation will initiate at some location ahead of the granulated bed/cast material interface. The work presented here is an effort to numerically model this Deflagration to Shock to Detonation Transition event. Results are presented showing the detonation build up for propellants/explosives with various initial void content and ramp wave compression loads. (Author).
Author: H. Krier
Publisher:
ISBN:
Category :
Languages : en
Pages : 121
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Book Description
Increasing the nitramine content of solid rocket propellants increases the overall performance of the system as well as the sensitivity to detonation by shock initiation. In some instances a confined zone of granulated propellant adjacent to a zone of cast propellant can provide a rapid enough pressure-rise rate ot shock initiate the cast material. If the cast propellant is porous, the detonation will initiate at some location ahead of the granulated bed/cast material interface. The work presented here is an effort to numerically model this Deflagration to Shock to Detonation Transition event. Results are presented showing the detonation build up for propellants/explosives with various initial void content and ramp wave compression loads. (Author).
Author: Herman W. Krier
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Book Description
This annual report represents the summary of work done on the modeling of processes leading from deflagration to detonation in porous or granular high energy propellants. Particular attention is paid to the analysis of shock development from compression waves forming ahead of confined burning in the original material. It is summarized that if the shock is sufficiently strong, it will lead to shock to detonation transition (SDT). During the development of the shock wave, the porous material may collapse into a solid plug of void free propellant because the speed at which the wave propagates increases as the material is compressed. The modeling effort presented indicates how two-phase unsteady combustion processes in granular material can couple to the solid mechanics of shock formation and eventually to a steady-state detonation. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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Book Description
Increasing the nitramine content of solid rocket propellants increases the overall performance of the system as well as the sensitivity to Shock to Detonation Transition (SDT) and Deflagration to Detonation Transition (DDT). This report deals primarily with the analysis and numerical modeling of a combined SDT/DDT event. The results show that in some instances a zone of burning granulated propellant, confined and adjacent to a zone of cast propellant, can provide a rapid enough pressure-rise rate to shock initiate the cast material. This type of detonation hazard scenario is a real possibility in any high-energy rocket motor environment. The modeling study also indicates areas where important assumptions need to be further researched. These include: (a) relations for dynamic (transient) collapse of the voids or pores; (b) relations for setting the volume percent of hot spots based on initial porosity; (c) the evaluation and expression for the chemical rate of decomposition of the reactive, shocked material; and (d) the assessment of two-phase mixture equilibrium. The predicted run-to detonation distance as a function of porosity for HMX explosive compares favorably with limited shock initiation experiments. There is no data available to check whether the predictions of ramp-wave compressions (where rise times exceed several microseconds) presented here are valid.
Author:
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Category : Aeronautics
Languages : en
Pages : 1346
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Author: Daniel W. Coyne
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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When a high energy solid propellant or explosive becomes porous, either by design or by accidental damage, it becomes more sensitive to shock-to-detonation transition (SDT). Stress waves propagating ahead of the convective flame front cause pore collapse which creates a confined bulk reaction zone. With sufficient pressurization in the reaction zone, the stress waves coalesce to form a shock. This paper describes an attempt to model the shock formation in porous solids by coupling the -gas pressurization to the solid mechanics of pore collapse and shock formation. Concepts are presented which indicate why porous materials are more sensitive to shock initiation than solids; mainly it is due to a greater bulk energy and formation of localized hot spots. (Author).
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Category : Vietnam War, 1961-1975
Languages : en
Pages :
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Author: Herman Krier
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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Author: James Richard Stewart
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Author: C. A. Cudak
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
Increasing the nitramine content of solid rocket propellants increases the overall performance of the system as well as the sensitivity to detonation by shock initiation. In some instances a confined zone of granulated propellant adjacent to a zone of cast propellant can provide a rapid enough pressure-rise rate to shock initiate the cast material. If the cast propellant is porous, the detonation will initiate at some location ahead of the granulated bed/cast material interface. The work presented here is an effort to numerically model this Deflagration to Shock to Detonation Transition (DSDT) event. Results will be presented showing the detonation build up for propellant beds with various initial configurations and boundary conditions. (Author).
Author: University of Illinois at Urbana-Champaign. Engineering Documents Center
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 180
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