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Author : N. L. COLEBURN
Publisher :
ISBN 13 :
Total Pages : 23 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Thermal Behavior of Explosives Subjected to Simulated Aerodynamic Heating, i written by N. L. COLEBURN and published by . This book was released on 1959 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : N. L. COLEBURN
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Thermal Behavior of Explosives Subjected to Simulated Aerodynamic Heating, Iii written by N. L. COLEBURN and published by . This book was released on 1961 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: IGNITION TIME AND HEAT FLOW WERE MEASURED FOR 6 EXPLOSIVES, TESTED IN ONE-DIMENSIONAL, UNCONFINED ANALOGUES OF CYLINDRICAL, STEEL-CASED WARHEADS. They were unidirectionally heated at rates corresponding to aerodynamic heating associated with the sea-level flight of supersonic missiles and aircraft at low Mach numbers. With heating rates up to 100 C/min the runaway reaction occurs as a rapid deflagration beginning on the explosive's surface touching the steel case. When a temperature of 455 C was applied to the outer surface of the 1-cm thick steel warhead case, the explosive ignition times were: tetryl - 135 sec; TNT - 164 sec; PBX N-1 - 180 sec; pentolite - 139 sec; H-6 - 169 sec; and Comp. - 202 sec. PBX 9404 showed a small but inconclusive increase in impact-hammer sensitivity (the 50% point changed from 26 to 31 cm) after 3 thermal cycles between 20 C and 200 C. (Author).
Author : N. L. COLEBURN
Publisher :
ISBN 13 :
Total Pages : 47 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Thermal Behavior of Explosives Subjected to Simulated Aerodynamic Heating, Ii: Datb written by N. L. COLEBURN and published by . This book was released on 1962 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements were made of unidirectional heat flow, at rates up to 100 C per min, into a 2dimensional analogue of a warhead filled with the explosive DATB (1, 3-diamino-2, 4, 6-trinitrobenzene). In this experimental arrangement, deflagration of DATB discs 2-cm thick and 12.7 to 17.8 cm in diam, occurred when the hottest DATB layer reached 314 C (! 10 C). No high order detonations occurred. Extrapolation of the data, obtained with initial warhead- exterior temperatures of 337 C to 450 C, leads to the prediction that such a DATB-filled warhead would ignite in about 9 sec if caught in an oil fire. (Author).
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ISBN 13 :
Total Pages : 490 pages
Book Rating : 4.E/5 ( download)
Download or read book Notices of Changes in Classification, Distribution and Availability written by and published by . This book was released on 1999 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 828 pages
Book Rating : 4.E/5 ( download)
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 836 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (319 download)
Download or read book Explosive Trains written by and published by . This book was released on 1965 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (873 download)
Download or read book Simulating Thermal Explosion of RDX-based Explosives written by and published by . This book was released on 2004 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: We compare two-dimensional model results with measurements for the thermal, chemical and mechanical behavior in a thermal explosion experiment. Confined high explosives are heated at a rate of 1 C per hour until an explosion is observed. The heating, ignition, and deflagration phases are modeled using an Arbitrarily Lagrangian-Eulerian code (ALE3D) that can handle a wide range of time scales that vary from a structural to a dynamic hydro time scale. During the pre-ignition phase, quasi-static mechanics and diffusive thermal transfer from a heat source to the HE are coupled with the finite chemical reactions that include both endothermic and exothermic processes. Once the HE ignites, a hydro dynamic calculation is performed as a burn front propagates through the HE. Two RDX-based explosives, C-4 and PBXN-109, are considered, whose chemical-thermal-mechanical models are constructed based on measurements of thermal and mechanical properties along with small scale thermal explosion measurements. The simulated dynamic response of HE confinement during the explosive phase is compared to measurements in large scale thermal explosion tests. The explosion temperatures for both HE's are predicted to within 5 C. Calculated and measured wall strains provide an indication of vessel pressurization during the heating phase and violence during the explosive phase. During the heating phase, simulated wall strains provide only an approximate representation of measured values indicating a better numerical treatment is needed to provide accurate results. The results also show that more numerical accuracy is needed for vessels with lesser confinement strength. For PBXN-109, the measured wall strains during the explosion are well represented by the ALE3D calculations.
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Download or read book Thermal Response of Explosives Subjected to External Heating. [TNT, Comp. B, HMX, TATB, DATB, and NQ]. written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of unconfined one-dimensional heating experiments in slab geometry was conducted with TNT, Comp. B, plastic-bonded HMX, TATB, DATB, and NQ. The explosive samples were heated on one surface at heating rates between 10 and 25/sup 0/C/min. The experimentaly determined times and temperatures to ignition were reproduced computationally, with one exception, by solving a one-dimensional heat-conduction equation containing a zero-order reaction energy source term and a time-dependent temperature boundary condition. The one exception was plastic-bonded NQ. Unconfined plastic-bonded NQ did not ignite under the experimental conditions used. The heat-transfer mechanism in molten TNT, as expected, was convective; and for molten Comp. B, conductive. A reactive heat-transfer program, EXPLO, was written that is capable of solving the convective transfer mode and accepting mixtures of explosives reacting with first-order kinetics.
Author : M. A. McClelland
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)
Download or read book Simulating the Thermal Response of High Explosives on Time Scales of Days to Microseconds written by M. A. McClelland and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present an overview of computational techniques for simulating the thermal cookoff of high explosives using a multi-physics hydrodynamics code, ALE3D. Recent improvements to the code have aided our computational capability in modeling the response of energetic materials systems exposed to extreme thermal environments, such as fires. We consider an idealized model process for a confined explosive involving the transition from slow heating to rapid deflagration in which the time scale changes from days to hundreds of microseconds. The heating stage involves thermal expansion and decomposition according to an Arrhenius kinetics model while a pressure-dependent burn model is employed during the explosive phase. We describe and demonstrate the numerical strategies employed to make the transition from slow to fast dynamics.
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ISBN 13 :
Total Pages : 1416 pages
Book Rating : 4.3/5 (91 download)
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1964 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 922 pages
Book Rating : 4.:/5 (319 download)
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1970 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Defense Documentation Center (U.S.)
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ISBN 13 :
Total Pages : 290 pages
Book Rating : 4.3/5 (91 download)
Download or read book Symposia written by Defense Documentation Center (U.S.) and published by . This book was released on 1963 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 528 pages
Book Rating : 4.:/5 (31 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1993 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
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ISBN 13 :
Total Pages : 2084 pages
Book Rating : 4.E/5 ( download)
Download or read book A Selected Listing of NASA Scientific and Technical Reports for 1966 written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1967 with total page 2084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1368 pages
Book Rating : 4.3/5 (129 download)
Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1971 with total page 1368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1142 pages
Book Rating : 4.3/5 (91 download)
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1971 with total page 1142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
