scholarly journals Experimental and Numerical Research in Explosive Loading of Two- and Three-Component Solid Mixtures

2013 ◽  
Vol 16 (1) ◽  
pp. 3 ◽  
Author(s):  
O.V. Ivanova ◽  
S.A. Zelepugin ◽  
A.S. Yunoshev ◽  
V.V. Sil’vestrov
Keyword(s):  
Axial Direction ◽  
Explosive Loading ◽  
Detonation Products ◽  
Explosive Compaction ◽  
Explosion Products ◽  
Joint Deformation ◽  
Numerical Research ◽  
Cylindrical Steel ◽  
Recovery Ampoule ◽  
Explosive Layer

We have conducted experimental and numerical research in two- and three-component solid mixtures placed into a cylindrical recovery ampoule under explosive loading. Behavior of the mixture is described by a mathematical model of a multicomponent medium. In the model, every component of a mixture simultaneously occupies the same volume as the mixture. Components interact with each other, exchanging momentum, energy, and mass (if the chemical reaction between the components occurs). An equality of components’ pressure is chosen as a condition for joint deformation of components. Finite element method is used for solving the problems. We considered experimentally and numerically explosive loading of the<br />aluminum-sulfur mixture, and explosive compaction of the aluminum-sulfur-carbon mixture in a cylindrical steel ampoule. The inert substance (graphite) was added to the mixture to avoid the reaction between aluminum and sulfur. Most of the focus is on simulating the action of explosion products on the ampoule.<br />In the computations the actions of the detonation products surrounding the ampoule was simulated by the action of pressure on the upper part of the ampoule in a vertical (axial) direction and on the lateral surface of the ampoule in a horizontal (radial) direction. We varied the thickness of the explosive that acts on the upper part of the ampoule in the axial direction in order to study the influence of the parameter on a final shape and size of the ampoule. We founded the essential influence of the thickness of the explosive layer on the final result of explosive compaction. Insufficient thickness of explosives, as well as the excessive thickness may be a reason for an incompletely compacted final product or lead to the formation of cracks or damage.<br /><br />

Explosive Compaction of Solid Inert Three-Component Mixtures Taking into Account a Different Thickness of the Explosive Axial Layer

2015 ◽  
Vol 770 ◽  
pp. 174-178
Author(s):  
Oxana V. Ivanova ◽  
Sergey A. Zelepugin
Keyword(s):  
Axisymmetric Problem ◽  
Explosive Compaction ◽  
Inert Substance ◽  
Formation Of Cracks ◽  
Cylindrical Steel ◽  
Different Thickness ◽  
Explosive Layer

We consider the axisymmetric problem of explosive compaction of a mixture from aluminum, sulfur and carbon placed into a cylindrical steel ampoule. The inert substance (graphite) is added to the mixture to avoid the reaction between aluminum and sulfur. We found the essential influence of the thickness of the explosive layer on the final result of explosive compaction. Insufficient thickness of explosives, as well as the excessive thickness may be a reason for an incompletely compacted final product or lead to the formation of cracks or damage.

scholarly journals Experimental and Numerical Research on Cylindrical Tubes under Outer Cylindrical Explosive Waves

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Sui Yaguang ◽  
Zhang Dezhi ◽  
Tang Shiying ◽  
Chen Bo
Keyword(s):  
Numerical Methods ◽  
Numerical Simulations ◽  
Explosive Loading ◽  
Important Application ◽  
Uniform Deformation ◽  
Collision Region ◽  
Explosive Wave ◽  
Cylindrical Tubes ◽  
Numerical Research ◽  
Microscopic Deformation

Cylindrical explosive loading has an important application in explosive working, researching on weapon damage, and explosive-driving load. This study uses experimental and numerical methods to study the response of long and thin tubes when subjected to cylindrical explosive loading. The flake-like charge and multipoint initiation technique were adopted to load cylindrical explosive waves. Experimental results showed that the method could produce uniform deformation in certain parts of the long tube, but partial spall injuries occurred after the explosion. The macroscopic and microscopic deformation of tubes were analyzed. Numerical simulations were conducted to investigate the detailed response of the tube subjected to a cylindrical explosive wave. The results indicate that the collision of explosive waves brought inconsistencies in pressure and velocity. The pressure and velocity in the collision region were significantly higher than those of other parts, which caused the collision region to be easily damaged.

scholarly journals Estimating the consequences of an explosion on critical infrastructure

2020 ◽  
pp. 114-123
Author(s):  
Andrzej Papliński
Keyword(s):  
Physical Environment ◽  
Critical Infrastructure ◽  
Explosive Loading ◽  
Detonation Properties ◽  
Reaction Products ◽  
Condensed Explosive ◽  
Detonation Products ◽  
Loading Effects ◽  
Detonation Energy ◽  
Good Agreement

The study is an analysis estimating the threat arising from the detonation products of a condensed explosive on the physical environment. It presents an analysis of fundamental detonation properties such as detonation height and Mach wave formation, related to their loading effects on critical infrastructure. Analytical equations as well as modelling were investigated to predict the effects of explosive loading on surroundings and people. Comparisons were made between the results from calculations with those of the equations, based on approximated experimental data. It was concluded that when applying the JWL equation of state to the reaction products of TNT, good agreement was obtained between modeling and experimental results for the detonation energy derived with the aid of thermodynamic calculations.

Numerical 3D-modeling of spall and shear fractures in shells of austenitic 12Kh18N10T steel and 30KhGSA steel under their spherical and quasi-spherical explosive loading

2015 ◽  
Vol 06 (01) ◽  
pp. 1550011 ◽  
Author(s):  
Evgeny A. Kozlov ◽  
Oleg V. Ol'khov ◽  
Ekaterina V. Shuvalova
Keyword(s):  
3D Modeling ◽  
Laser Interferometry ◽  
12Kh18n10t Steel ◽  
Explosive Loading ◽  
Outer Radius ◽  
Experimental Setup ◽  
Paper Briefly ◽  
30Khgsa Steel ◽  
Scanning Electron ◽  
Explosive Layer

To pursue VNIIEF–VNIITF joint investigations, this paper briefly describes the experimental setup and provides numerical 3D-computation results (LEGAK-3D technique) on special features in the convergence dynamics of steel shells under their quasi-spherical explosive loading in the system with the 40-mm outer radius of the explosive layer. The computation results were compared with the data experimentally registered for shells of the 30KhGSA steel, both as-received and quenched to HRC 35…40, and the austenitic 12Kh18N10T stainless steel. The comparison was also made with laser-interferometry results obtained directly under explosive loading, as well as with gamma-tomography and scanning electron microscopy investigations of the recovered shells.

scholarly journals On Possibility of Detonation Products Temperature Measurements of Emulsion Explosives

2014 ◽  
Vol 59 (3) ◽  
pp. 1151-1154
Author(s):  
V. V. Silvestrov ◽  
S. A. Bordzilovskii ◽  
S. M. Karakhanov ◽  
A. V. Plastinin
Keyword(s):  
Optical Signal ◽  
Optical Pyrometer ◽  
Detonation Pressure ◽  
Emulsion Explosive ◽  
Detonation Products ◽  
Emulsion Explosives ◽  
Explosion Products ◽  
The Matrix ◽  
First Time ◽  
Detonation Temperature

Abstract The new view on the structure of the radiance signal recorded by optical pyrometer and the preliminary results of brightness detonation temperature of the emulsion explosive are presented. The structure of an optical signal observed is typical for the heterogeneous explosives. First, there is the short temperature spike to 2500 ÷ 3300 K connecting with a formation of “hot spots” assembly that fire the matrix capable of exothermal reaction. Then the relaxation of radiance to equilibrium level is observed that corresponds to brightness temperature 1840 ÷ 2260 K of explosion products at detonation pressure 1 ÷ 11 GPa. Experimental results are compared with the calculations of other authors. The detonation temperature of the investigated explosive is measured for the first time.

scholarly journals Investigation of the process of explosive loading of freshwater ice

2019 ◽  
Vol 23 (Suppl. 2) ◽  
pp. 561-567 ◽  
Author(s):  
Maxim Orlov
Keyword(s):  
Quantitative Assessment ◽  
Explosive Loading ◽  
Ice Formation ◽  
Emulsion Explosive ◽  
Detonation Products ◽  
Medium Thickness ◽  
Qualitative And Quantitative ◽  
Freshwater Ice ◽  
First Case ◽  
Ice Edge

The behaviour of freshwater ice under the action of detonation products has been studied. As objects of the study was chosen snow covered ice of medium thickness. The ice cover of 2018 and 2017 on the Tom River was considered in current research. The age of the ice was approximate 130 days, but the temperature of its formation was different. In the first case (2017), the ice formation temperature was 7.5 % lower than in the second case. The sizes of the lanes in the snow covered ice after detonation of 4 kg of emulsion explosive are obtained. It was established that in the second case the diameter of the lane was 15% smaller than in the first case. The ice edge of the lane in the snow-covered and bare ice was determined. The edge of the needle ice, which had a stepped shape, is presented. A qualitative and quantitative assessment of the destruction of ice under explosive loads is given. It was found that the temperature of ice formation influenced the process of its destruction under explosive loads.

Response of a cylindrical steel container to internal explosive loading with variation in the degree of water filling

2000 ◽  
Vol 36 (4) ◽  
pp. 523-537 ◽  
Author(s):  
V. A. Ryzhanskii ◽  
A. G. Ivanov ◽  
N. P. Kovalev ◽  
G. P. Simonov ◽  
Yu. D. Chernyshov ◽  
...  
Keyword(s):  
Explosive Loading ◽  
Steel Container ◽  
Internal Explosive Loading ◽  
Water Filling ◽  
Cylindrical Steel

scholarly journals Equations of state for detonation products of explosives

2021 ◽  
pp. 1-38
Author(s):  
Viktor Vasilievich Val'ko ◽  
Oleg Petrovich Obraz ◽  
Vladimir Anontol’evich Gasilov ◽  
Valentina Sergeevna Solovyova ◽  
Nikita Olegovych Savenko
Keyword(s):  
Comparative Analysis ◽  
Equation Of State ◽  
Equations Of State ◽  
Mechanical Action ◽  
Multicomponent Mixtures ◽  
Detonation Products ◽  
Thermal Equation ◽  
Explosion Products ◽  
Condensed Explosives ◽  
Gasdynamic Problems

A comparative analysis of the equations of state for the detonation products of condensed explosives, which are most used in solving problems of the mechanical action of an explosion, is presented. For the most widespread (cited) equations of state of explosion products in the form of JWL, methods and algorithms are proposed for determining the correctness of specifying the coefficients included in this equation. To solve radiation-gasdynamic problems, including multicomponent mixtures, a version of the thermal equation of state of explosion products in the form of JWL is proposed, and a constant set for the most common explosives is recommended.

Experimental Study on Forming Underground Space in Soil Using Explosive Lining Method

2007 ◽  
Vol 353-358 ◽  
pp. 1121-1124 ◽  
Author(s):  
Peng Shao ◽  
Dong Quan Wang ◽  
Chun Rong Liu ◽  
Yu Xiao Zhu
Keyword(s):  
Dynamic Stress ◽  
Mechanical Performance ◽  
Explosive Loading ◽  
Underground Space ◽  
Forming Process ◽  
Explosive Compaction ◽  
Equivalent Radius ◽  
Compact Region ◽  
Performance Indexes ◽  
Compaction Method

Explosive lining is a new method to construct underground space in soil. By making the most of compressibility of soil and thixotropy of concrete under explosive loading, this method offers an efficient path to form a cavity and its concrete support layer synchronously. In order to investigate the forming effect, a series of contrastive laboratory tests, including explosive lining method and conventional explosive compaction method, were performed under same soil and explosive conditions. Results show that measured dynamic stress and displacement by explosive lining method are higher than that of by conventional explosive compaction method under same equivalent radius, and the range of compact region in soil is larger too. Similarly, the physical and mechanical performance indexes of soil, such as water content and cohesion are superior to that of by conventional explosive compaction. It is approved that an even thickness concrete support layer can be formed in one-shot forming process by explosive lining, and there is no evident cranny region in the soil around the cavity.

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