Interaction of detonation products of a cylindrical high-explosive charge with a surrounding gas

1981 ◽  
Vol 17 (3) ◽  
pp. 344-346
Author(s):  
V. I. Mali ◽  
A. K. Rebrov ◽  
G. A. Khramov ◽  
S. F. Chekmarev
Keyword(s):  
Explosive Charge ◽  
High Explosive ◽  
Detonation Products

Analysis of Shell Material Influence on Detonation Process in High Explosive Charge

2016 ◽  
Vol 715 ◽  
pp. 27-32 ◽  
Author(s):  
Igor Balagansky ◽  
Alexey Vinogradov ◽  
Lev Merzhievsky ◽  
Alexander Matrosov ◽  
Ivan Stadnichenko
Keyword(s):  
Explosive Charge ◽  
Symmetry Axis ◽  
High Explosive ◽  
Detonation Front ◽  
Detonation Pressure ◽  
Ceramic Shell ◽  
Shell Material ◽  
Detonation Products ◽  
Transverse Waves ◽  
Detonation Process

The influence of the shell material (copper and silicon carbide) on the detonation process in cylindrical high explosive charge is experimentally and numerically investigated. We observed the significant differences of wave pictures in the detonation products and in the shells, which were due to differences in the sound velocities in the shells and rapid destruction of the ceramic shell under explosion loading. The specific features of a wave picture at the interface HE/ceramics due to desensitization of explosive under loading by an advanced wave in the shell were detected. Those features lead to decreasing of detonation pressure, blurring of the detonation front, and to increasing of mass velocity behind detonation front that is typical for under-compressed detonation. On the symmetry axis of HE charge in the ceramic shell behind the detonation front the long zone with practically constant pressure was observed. We have identified the mechanism of transmission of disturbances from the periphery to the symmetry axis of the HE charge. The source of the emergence of this zone is identified as transverse waves propagating directly behind the detonation front from the periphery to the symmetry axis of the HE charge.

Transformation of Structure in Carbon Steel Specimen under Loading by Mach Stem, Formed in Preliminary Compressed High Explosive Charge TG-40

2011 ◽  
Vol 673 ◽  
pp. 89-94 ◽  
Author(s):  
Ivan A. Bataev ◽  
Igor A. Balagansky ◽  
Anatoly Bataev ◽  
Kazuyuki Hokamoto
Keyword(s):  
Carbon Steel ◽  
Explosive Charge ◽  
High Explosive ◽  
Steel Specimen ◽  
Explosive Loading ◽  
Metallographic Analysis ◽  
Heterogeneous Structure ◽  
Mach Stem ◽  
Localized Deformation ◽  
Current Loading

A structure of a carbon steel specimen after explosive loading is investigated. The loading was executed by Mach stem, formed in high explosive charge that was preliminary compressed by advanced wave in ceramic bar. In the original condition the specimen had a typical for low carbon steel ferrite-pearlite structure. Metallographic analysis has shown that during the process of the explosive loading the following structural changes took place: formation of numerous deformation twins in both ferrite grains and pearlite colonies (i.e. in two-phase structure); formation of extended bands of localized deformation, which are not crystallographically connected with the original ferrite-pearlite structure; fine grains formation in zones of severe plastic flow. The size of the ferrite grains is by an order of magnitude less than the original grains size. According to the authors’ opinion, above-noted structural peculiarities demonstrate that loading conditions achieved in the current loading scheme differ from common. The phenomenon of non-typical twinning in heterogeneous structure (pearlite) indirectly evidences that extremely high stresses and strain rates took place in the specimen during the loading.

scholarly journals Modeling Blast Loading on Buried Reinforced Concrete Structures with Zapotec

2008 ◽  
Vol 15 (2) ◽  
pp. 137-146 ◽  
Author(s):  
Greg C. Bessette
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Explosive Charge ◽  
High Explosive ◽  
Concrete Structures ◽  
Blast Loading ◽  
Reinforced Concrete Structures ◽  
Reinforced Concrete Structure ◽  
Solution Approach ◽  
Coupling Algorithm

A coupled Euler-Lagrange solution approach is used to model the response of a buried reinforced concrete structure subjected to a close-in detonation of a high explosive charge. The coupling algorithm is discussed along with a set of benchmark calculations involving detonations in clay and sand.

Exploring the Uncertainty in the Equation of State for a High Explosive Fit to Heterogeneous Data

2019 ◽  
Author(s):  
Stephen A. Andrews ◽  
Andrew M. Fraser ◽  
Scott I. Jackson ◽  
Eric K. Anderson
Keyword(s):  
Equation Of State ◽  
Functional Form ◽  
High Explosive ◽  
Heterogeneous Data ◽  
Calibration Data ◽  
Detonation Products ◽  
Single Experiment ◽  
Calibration Experiment ◽  
Free Parameters ◽  
Physics Model

Abstract The extreme pressures and temperatures of the gas produced by detonating a High Explosive (HE) make it difficult to use experimental measurements to estimate the Equation Of State (EOS), the physics model that relates pressure, temperature, and density of the gas. Instead of measuring pressure directly one measures effects like the acceleration of metals driven by the HE. Typically one fits a few free parameters in a fixed functional form to measurements from a single experiment. The present work uses the optimization tool F_UNCLE to incorporate data from multiple experiments into a single EOS model for the gas produced by detonating the explosive PBX 9501. The model is verified by comparison to an experiment from outside the set of calibration data. The uncertainty in the EOS is also is examined to determine how each calibration experiment constrains the model and how the uncertainty arising from all calibration experiments affects predictions. This work identifies an EOS for HE detonation products and uncertainty about the EOS.

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