Download or read book Deflagration to detonation Transition in Granular Double base Propellant written by Jason D. Rogers and published by . This book was released on 2012 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Shock to Detonation Transition in Composite and Double Base Propellants written by N. L. Coleburn and published by . This book was released on 1964 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plane shock wave compressions were used to obtain the unreacted shock Hugoniots of a composite and a double base propellant. One propellant contained a hybrid explosive mixture. For this propellant smear camera measurements were made of the shock velocity build-up to steady detonation velocity as a function of travel distance in wedge-shaped specimens, for entering pressures of 62.4, 72.3, and 78.9 kilobars. These measurements showed the propellants to be as sensitive to rapidly applied shocks as cast Composition B. Under similar shock pressures the second propellant, which contained no explosive, burned uneventfully without detonating. (Author).
Download or read book Modeling of Deflagration to Shock to Detonation Transition DSDT in Porous High Energy Solid Propellants and Explosives written by Herman W. Krier and published by . This book was released on 1982 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Raising the Flag of Truth written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Granular Propellant Fracture on the Transition from Deflagration to Detonation written by Yang Tao and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1989 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented in this publication cover special problems in the field of energetic materials, particularly detonation phenomena in solids and liquids. General subject areas include shock-to-detonation transition, time resolved chemistry, initiation modeling, deflagration-to-detonation transition, equation of state and equation of state and performance, composites and emulsions, and composites and emulsions/underwater explosives, reaction zone, detonation wave propagation, hot spots, detonation products, chemistry and compositions, and special initiation.
Download or read book Fluid Mechanical Processes of Deflagration to Detonation Transition in Beds of Porous Reactive Solids written by Stephen James Hoffman and published by . This book was released on 1980 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fluid mechanical processes which characterize a transition from deflagration to detonation in granular beds of solid propellant have not at present been sufficiently refined to allow accurate modelling of the phenomenon. In an attempt to improve this situation, this report has investigated what might be considered basic mechanisms and consequences that arise from a set of assumptions for the governing and constitutive equations which take into account the two phase nature of this problem. A qualitative description of the flow process is made, based on observations obtained from DDT experiments. From this, certain conclusions are reached as to the properties needed by propellants to exhibit a deflagration to detonation transition (DDT). The numerical integration scheme itself is examined in detail in order to further understand the consequences of its use.
Download or read book Deflagration to Detonation Transition in Heteorogeneous Solids A Bibliography written by E. W. Price and published by . This book was released on 1980 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication contains a list of 341 references relating to the mechanism of transition to detonation in heterogeneous high energy solids, with particular reference to solid rocket propellants and granular propellant charges for guns. Because of the important role played by porosity, many of the references pertain to flow, flame spread and pressure rise in porous materials, and to the mechanics of formation cracks and propagation under dynamic loading. This partial list of references was developed primarily from lists contained in papers presented at the 1978 ONR/AFOSR Workshop on Deflagration-to-Detonation Transition (CPIA Publication 229, September 1978), and from reports received subsequent to that Workshop. A subject coding was developed and used to classify each reference. (Author).
Download or read book Deflagration to Detonation Transition in Granular HMX written by Nathan Burnside and published by . This book was released on 2001 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Deflagration to detonation Transition in Granular Secondary Explosives written by Peter Elliott Luebcke and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Thermal Mechanical Model of Deflagration to Detonation in Granular Energetic Materials written by M. R. Baer and published by . This book was released on 1984 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work we present a multiphase, reactive flow model, based on the theory of mixtures and utilize it to describe deflagration-to-detonation transition in granular explosives and propellants. This nonequilibrium model treats each phase as fully compressible and incorporates a dynamic compaction model for the granular reactant. Formulation of the constitutive models include a pressure-dependent burn rate and experimentally-determined porous bed permeability. Numerical solutions of the one-dimensional Eulerian equations are obtained using an implicit method-of-lines solver. The model has examined two exlosives: CP and HMX. Predictions with this model agree with existing experimental observations and demostrate that a thermodynamically-consistent multiphase model can describe the flame-spread processes of convective burning and detonation.
Download or read book Transition from Deflagration to Detonation in Granular Explosives written by Richard R. Bernecker and published by . This book was released on 1972 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deflagration to detonation transition (DDT) has been observed for 91/ 9 RDX/Wax over the range of 67 - 95% TMD. The initial process monitored was the propagation of a convective flame front through the porous charge. Some time after that a postconvective front was formed; it traveled at a greater speed and overtook the convective front. About 10 - 20 microseconds after this intersection and 10 - 20 mm beyond it, detonation appeared. Details of this proposed mechanism and their variation with compaction are fully described in the report. A few experiments at 70% TMD were also made on 97/3 and 94/6 RDX/ Wax and on ammonium picrate. Only the latter failed to undergo a transition to detonation in the apparatus used.
Download or read book Deflagration to detonation Transition in Granular HMX written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental studies of the deflagration-to-detonation transition (DDT) in chemical explosives, specifically, granular HMX, are reviewed. The picture of the DDT process as presented here results from an attempt to incorporate common experimental observations which have heretofore been puzzling. It differs from that presented by G.B. Kistiakowsky in that the role of convective combustion is terminated and mechanical processes are postulated as the means of continuing the reaction buildup until shock waves are formed. In order to validate this picture it will be necessary both to review the experimental literature for observations which may not be reconcilable with it, and to subject each step in the proposed DDT process to detailed scrutiny. (LCL).
Download or read book Analysis of Deflagration to Detonation Transition in High energy Solid Propellants written by Patrick Barry Butler and published by . This book was released on 1984 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Deflagration to Detonation Transition of Gun and Small Arms Propellants written by and published by . This book was released on 1988 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the early 1970s at least 4 accidents have occurred in European countries in which propellants have burned to detonation, that is have undergone a transition from deflagration to detonation, all of which involved porous small arms propellants. This report reviews the findings of researchers in Finland, France, the Federal Republic of Germany, the Netherlands, Switzerland, the United Kingdom, and the United States who studied the potential of a variety of propellants to detonate under different confinement conditions. Details of work performed are given and information is included on tests used in the various studies and the results of those tests.
Download or read book Deflagration to Shock to Detonation Transition of Energetic Propellants written by H. Krier and published by . This book was released on 1984 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is well known that explosive-based propellants are susceptible to detonation from the controlled deflagration mode of combustion. 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 has voids, the detonation will initiate at some location ahead of the granulated bed/cast material interface. This report is a summary of the research activities that focus on the analysis and modeling of the physics of such highly transient flows.
