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Shock Initiation Modelling Of Explosives
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Book Synopsis Shock Initiation Modelling of Explosives by :
Download or read book Shock Initiation Modelling of Explosives written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report, a description is given of the modeling work on the subject of shock initiation of explosive materials that has been carried out at TNO Prins Maurits Laboratory (TNO-PML) in recent years. Initially, simulations were carried out with the Lee-Tarver shock initiation model, implemented in the hydrocode Autodyn. Although several aspects of shock initiation can be described satisfactorily with this model, the model cannot describe the experimentally observed dependencies of the initiation behaviour on the explosive particle size. Therefore the model has been adjusted by incorporating a viscoplastic pore collapse initiation mechanism, based on the work of Khasainov et al. The first results obtained with the adjusted model show that some experimental results can already be explained and that the incorporation of the pore collapse mechanism is a good starting point for further development of the shock initiation model.
Book Synopsis Numerical Modeling of Explosives and Propellants by : Charles L. Mader
Download or read book Numerical Modeling of Explosives and Propellants written by Charles L. Mader and published by CRC Press. This book was released on 2007-10-18 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: Major advances, both in modeling methods and in the computing power required to make those methods viable, have led to major breakthroughs in our ability to model the performance and vulnerability of explosives and propellants. In addition, the development of proton radiography during the last decade has provided researchers with a major new experimental tool for studying explosive and shock wave physics. Problems that were once considered intractable – such as the generation of water cavities, jets, and stems by explosives and projectiles – have now been solved. Numerical Modeling of Explosives and Propellants, Third Edition provides a complete overview of this rapidly emerging field, covering basic reactive fluid dynamics as well as the latest and most complex methods and findings. It also describes and evaluates Russian contributions to the experimental explosive physics database, which only recently have become available. This book comes with downloadable resources that contain— · FORTRAN and executable computer codes that operate under Microsoft® Windows Vista operating system and the OS X operating system for Apple computers · Windows Vista and MAC compatible movies and PowerPoint presentations for each chapter · Explosive and shock wave databases generated at the Los Alamos National Laboratory and the Russian Federal Nuclear Centers Charles Mader’s three-pronged approach – through text, computer programs, and animations – imparts a thorough understanding of new computational methods and experimental measuring techniques, while also providing the tools to put these methods to effective use.
Book Synopsis The Modelling of Shock Initiation of Detonation in High Explosives Using the EPIC 2 Hydrocode with the Forest Fire Model by : Ijsselstein R. R.
Download or read book The Modelling of Shock Initiation of Detonation in High Explosives Using the EPIC 2 Hydrocode with the Forest Fire Model written by Ijsselstein R. R. and published by . This book was released on 1985 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shock Initiation of Modeling Multicomponent Explosives by :
Download or read book Shock Initiation of Modeling Multicomponent Explosives written by and published by . This book was released on 1977 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shock Initiation Modeling of Multicomponent Explosives by : Yehuda Partom
Download or read book Shock Initiation Modeling of Multicomponent Explosives written by Yehuda Partom and published by . This book was released on 1989 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three Dimensional Modeling of Shock Initiation of Heterogeneous Explosives by :
Download or read book Three Dimensional Modeling of Shock Initiation of Heterogeneous Explosives written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The basic processes in the shock initiation of heterogeneous explosives have been investigated theoretically using a model of a cube of nitromethane containing 91 cubic air holes. The interaction of a shock wave with the density discontinuities, the resulting hot spot formation and interaction, and the buildup to propagating detonation were computed using three-dimensional numerical Eulerian hydrodynamics with Arrhenius chemical reaction and accurate equations of state. The basic process in the desensitization of a heterogeneous explosive by preshocking with a shock pressure too low to cause propagating detonation was numerically modeled.
Book Synopsis Numerical Modeling of the Effect of Particle Size of Explosives on Shock Initiation Properties by : Charles L. Mader
Download or read book Numerical Modeling of the Effect of Particle Size of Explosives on Shock Initiation Properties written by Charles L. Mader and published by . This book was released on 1988 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Modeling of Insensitive High-explosives Initiation by :
Download or read book Numerical Modeling of Insensitive High-explosives Initiation written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The initiation of propagating, diverging detonation is usually accomplished by small conventional initiators. As the explosive to be initiated becomes more shock insensitive, the initators must have larger diameters to be effective. Very shock-insensitive explosives have required initiators larger than 2.5 cm. We have numerically examined the process of initiation of propagating detonation as a function of the shock sensitivity of the explosive using the two-dimensional Lagrangian reactive hydrodynamic code 2DL and the Forest Fire rate to describe the shock initiation process of heterogeneous explosives. The initiation of propagating detonation in shock-insenstive explosives containing triamino trinitrobenzene results in large regions of partially decomposed explosive even when initiated by large initiators. The process has been observed experimentally and reproduced numerically.
Book Synopsis Modeling Shock Initiation in Composition B. by :
Download or read book Modeling Shock Initiation in Composition B. written by and published by . This book was released on 1993 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: A hydrodynamic modeling study of the shock initiation behavior of Composition B explosive was performed using the {open_quotes}Ignition and Growth of Reaction in High Explosive{close_quotes} model developed at the Lawrence Livermore National Laboratory. The HE (heterogeneous explosives) responses were computed using the CALE and DYNA2D hydrocodes and then compared to experimental results. The data from several standard shock initiation and HE performance experiments was used to determine the parameters required for the model. Simulations of the wedge tests (pop plots) and failure diameter tests were found to be sufficient for defining the ignition and growth parameters used in the two term version of the computational model. These coefficients were then applied in the response analysis of several Composition B impact initiation experiments. A description of the methodology used to determine the coefficients and the resulting range of useful application of the ignition and growth of reaction model is described.
Book Synopsis SHOCK INITIATION EXPERIMENTS AND MODELING OF COMPOSITION B AND C-4 by : F. Garcia
Download or read book SHOCK INITIATION EXPERIMENTS AND MODELING OF COMPOSITION B AND C-4 written by F. Garcia and published by . This book was released on 2006 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock initiation experiments on the explosives Composition B and C-4 were performed to obtain in-situ pressure gauge data for the purpose of determining the Ignition and Growth reactive flow model with proper modeling parameters. A 101 mm diameter propellant driven gas gun was utilized to initiate the explosive charges containing manganin piezoresistive pressure gauge packages embedded in the explosive sample. Experimental data provided new information on the shock velocity versus particle velocity relationship for each of the investigated materials in their respective pressure range. The run-distance-to-detonation points on the Pop-plot for these experiments showed agreement with previously published data, and Ignition and Growth modeling calculations resulted in a good fit to the experimental data. These experimental data were used to determine Ignition and Growth reactive flow model parameters for these explosives. Identical ignition and growth reaction rate parameters were used for C-4 and Composition B, and the Composition B model also included a third reaction rate to simulate the completion of reaction by the TNT component. The Composition B model was then tested on existing short pulse duration, gap test, and projectile impact shock initiation with good results. This Composition B model can be applied to shock initiation scenarios that have not or cannot be tested experimentally with a high level of confidence in its predictions.
Download or read book كلمات ومواقف written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Modeling of Shock-sensitivity Experiments by :
Download or read book Numerical Modeling of Shock-sensitivity Experiments written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Forest Fire rate model of shock initiation of heterogeneous explosives has been used to study several experiments commonly performed to measure the sensitivity of explosives to shock and to study initiation by explosive-formed jets. The minimum priming charge test, the gap test, the shotgun test, sympathetic detonation, and jet initiation have been modeled numerically using the Forest Fire rate in the reactive hydrodynamic codes SIN and 2DE.
Book Synopsis SHOCK INITIATION OF COMPOSITION B AND C-4 EXPLOSIVES ; EXPERIMENTS AND MODELING. by : F. Garcia
Download or read book SHOCK INITIATION OF COMPOSITION B AND C-4 EXPLOSIVES ; EXPERIMENTS AND MODELING. written by F. Garcia and published by . This book was released on 2006 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock initiation experiments on the explosives Composition B and C-4 were performed to obtain in-situ pressure gauge data for the purpose of providing the Ignition and Growth reactive flow model with proper modeling parameters. A 100 mm diameter propellant driven gas gun was utilized to initiate the explosive charges containing manganin piezoresistive pressure gauge packages embedded in the explosive sample. Experimental data provided new information on the shock velocity--particle velocity relationship for each of the investigated material in their respective pressure range. The run-distance-to-detonation points on the Pop-plot for these experiments showed agreement with previously published data, and Ignition and Growth modeling calculations resulted in a good fit to the experimental data. Identical ignition and growth reaction rate parameters were used for C-4 and Composition B, and the Composition B model also included a third reaction rate to simulate the completion of reaction by the TNT component. This model can be applied to shock initiation scenarios that have not or cannot be tested experimentally with a high level of confidence in its predictions.
Book Synopsis Mesoscale Modelling of Shock Initiation in HMX-based Explosives by :
Download or read book Mesoscale Modelling of Shock Initiation in HMX-based Explosives written by and published by . This book was released on 2002 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Motivation: predictive capability Want to predict initiation, detonics and performance given: {sm_bullet} Variations in composition {sm_bullet} Variations in morphology {sm_bullet}Different loading conditions Previous work on PBX and ANFO: need physically-based model rather than just mechanical calibrations.
Book Synopsis A Simplistic Approach to the Shock Initiation of Detonation in Heterogeneous Explosives by : Philip M. Howe
Download or read book A Simplistic Approach to the Shock Initiation of Detonation in Heterogeneous Explosives written by Philip M. Howe and published by . This book was released on 1972 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model of the shock initiation of heterogeneous explosives is presented. The model is based upon a 'hotspot' ignition mechanism. Choice of the energy density as the independent variable in the problem permits separation of Hugoniot effects from the buildup process, and leads to a critical condition for initiation which is independent of the loading density. The model is found to be consistent with data from the literature on porous tetryl. (Author).
Book Synopsis A Model for Shock Initiation of Porous Explosives by Ramp Induced Compression Processes by : Christopher Andrew Cudak
Download or read book A Model for Shock Initiation of Porous Explosives by Ramp Induced Compression Processes written by Christopher Andrew Cudak and published by . This book was released on 1984 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shock Wave Science and Technology Reference Library, Vol. 5 by : Blaine Asay
Download or read book Shock Wave Science and Technology Reference Library, Vol. 5 written by Blaine Asay and published by Springer Science & Business Media. This book was released on 2009-12-16 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Los Alamos National Laboratory is an incredible place. It was conceived and born amidst the most desperate of circumstances. It attracted some of the most brilliant minds, the most innovative entrepreneurs, and the most c- ative tinkerers of that generation. Out of that milieu emerged physics and engineering that beforehand was either unimagined, or thought to be f- tasy. One of the ?elds essentially invented during those years was the science of precision high explosives. Before 1942, explosives were used in munitions and commercial pursuits that demanded proper chemistry and con?nement for the necessary e?ect, but little else. The needs and requirements of the Manhattan project were of a much more precise and speci?c nature. Spatial and temporal speci?cations were reduced from centimeters and milliseconds to micrometers and nanoseconds. New theory and computational tools were required along with a raft of new experimental techniques and novel ways of interpreting the results. Over the next 40 years, the emphasis was on higher energy in smaller packages, more precise initiation schemes, better and safer formulations, and greater accuracy in forecasting performance. Researchers from many institutions began working in the emerging and expanding ?eld. In the midst of all of the work and progress in precision initiation and scienti?c study, in the early 1960s, papers began to appear detailing the ?rst quantitative studies of the transition from de?agration to detonation (DDT), ?rst in cast, then in pressed explosives, and ?nally in propellants.
