A Single Pressure Model for Compressible Three-fluid Flows with High Explosive Material

2021 ◽  
Author(s):  
Lingquan Li ◽  
Rainald Lohner ◽  
Aditya Pandare ◽  
Hong Luo
Keyword(s):  
High Explosive ◽  
Fluid Flows ◽  
Explosive Material

Air blast TNT equivalence factors of high explosive material PETN for bare charges

2019 ◽  
Vol 377 ◽  
pp. 152-162 ◽  
Author(s):  
Weifang Xiao ◽  
Matthias Andrae ◽  
Norbert Gebbeken
Keyword(s):  
High Explosive ◽  
Explosive Material ◽  
Air Blast ◽  
Tnt Equivalence

scholarly journals Design Process of a Helical Flux Compression Generator

2018 ◽  
Vol 215 (4) ◽  
pp. 29-45
Author(s):  
Mariusz Makowski ◽  
Marta Czarnowska ◽  
Karol Biernacki ◽  
Rafał Namiotko
Keyword(s):  
Design Process ◽  
High Explosive ◽  
Field Tests ◽  
Mechanical Parameters ◽  
Test Results ◽  
Explosive Material ◽  
Model And Simulation ◽  
Flux Compression ◽  
Inner Diameter ◽  
Simulation Results

Abstract The article demonstrates the design process of a flux compression generator. Several armature configurations and materials have been analyzed. The influence of mechanical parameters, such as wall thickness, inner diameter of the armature or high explosive material used, on FCG performance has been estimated. The geometry of generators’ components has been optimized using the Finite Elements Method. Several generators have been built based on mathematical model and simulation results. The designed FCG’s performance has been verified during field tests. A comparison of simulation and field test results has been presented.

scholarly journals Interaction of TNT with Dopamine - A DFT Treatment

2019 ◽  
pp. 175-188
Author(s):  
Lemi Türker
Keyword(s):  
Density Functional Theory ◽  
Quantum Chemical ◽  
Spectral Properties ◽  
Density Functional ◽  
High Explosive ◽  
The Other ◽  
Explosive Material ◽  
Functional Theory ◽  
Endogenous Catecholamine ◽  
Π Complex

2,4,6-trinitrotoluene, known as TNT is a widely used high explosive material. Its disastrous effects to health are reported but how it executes those effects biochemically has been scarcely studied. On the other hand, dopamine is an important endogenous catecholamine. The present study deals with interaction of TNT and dopamine within the restrictions of density functional theory at the level of B3LYP/6-31+G(d). Some structural, quantum chemical and spectral properties are obtained for TNT + dopamine composite. They may form two electronically stable π-π complex, TNT acting as π-acceptor and dopamine is the donor. Thermo chemical calculations indicate that formation of the complexes are unfavorable at the standard conditions but the endo-form of the complex is less unfavorable compared to the exo-form.

Rapid Synthesis of Monodispersed TATB Microparticles in Ionic Liquid Micelles

MRS Advances ◽  
2018 ◽  
Vol 4 (15) ◽  
pp. 843-849
Author(s):  
Casey Karler ◽  
Leanne Alarid ◽  
David Rosenberg ◽  
Hongyou Fan
Keyword(s):  
Ionic Liquid ◽  
Energetic Materials ◽  
High Explosive ◽  
Research Effort ◽  
Synthesis Method ◽  
Explosive Material ◽  
Rapid Synthesis ◽  
Hydrophilic Lipophilic Balance ◽  
Significant Interest ◽  
Microscopic Morphology

ABSTRACTControlling microscopic morphology of energetic materials is of significant interest for the improvement of their performance and production consistency. As an important insensitive high explosive material, triaminotrinitrobenzene (TATB) has attracted tremendous research effort for military grade explosives and propellants. In this study, a new, rapid and inexpensive synthesis method for monodispersed TATB microparticles based on micelle-confined precipitation was developed. Surfactant with proper hydrophilic-lipophilic balance value was found to be critical to the success of this synthesis. The morphology of the TATB microparticles can be tuned between quasi-spherical and faceted by controlling the speed of recrystallization.

scholarly journals Effect of Selenium on TNAZ Molecule - A DFT Treatment

2021 ◽  
pp. 119-135
Author(s):  
Lemi Türker
Keyword(s):  
Density Functional Theory ◽  
Ground State ◽  
Quantum Chemical ◽  
Density Functional ◽  
High Explosive ◽  
Selenium Atom ◽  
Explosive Material ◽  
Functional Theory ◽  
Present Treatment ◽  
Quantum Chemical Data

The present treatment deals with an unusual composite of TNAZ that is TNAZ+ nSe(n:1,2) within the constraints of density functional theory at the level of UB3LYP/6-31++G(d,p). TNAZ is an insensitive high explosive material. Since, selenium atom in its ground state has two unpaired electrons, the composites are considered in their singlet, triplet and quintet states. Selenium and TNAZ interact at different extents and the systems are electronically stable but TNAZ+2Se (singlet) structurally decomposes by the elongation of one of the geminally substituted nitro groups. Modeling studies indicate that the N-O bond elongation in the composite mentioned occurs only if azetidine ring is present with or without the nitramine bond. For the composites various structural, electronic and quantum chemical data have been harvested and discussed.

scholarly journals Propellant Stimulation and Hydraulic Fracturing

2021 ◽  
Vol 9 (6) ◽  
pp. 80-96
Author(s):  
Essa Georges Lwisa
Keyword(s):  
Hydraulic Fracturing ◽  
Compressive Stress ◽  
Fluid Flows ◽  
Injection Rate ◽  
Explosive Material ◽  
Material Quality ◽  
Reservoir Rocks ◽  
A Value ◽  
Principal Elements

The Propellant Stimulation is applied to increase the permeability of rocks; a certain quantity of explosive material is donated at the bottom of the well opposite the producing layer, which causes many cracks in the near well area. A good Propellant Stimulation process must consider the explosive material quality and quantity, and the explosion should be prevented from vertically spread so all its energy will be used to crack the rocks. The first part of this chapter explains all the above in addition to the directed explosions and its calculation in an easy way. In the second part, I explained the Hydraulic Fracturing of the reservoir rocks in details, from principal elements of the process passing through cracking fluids, proppants, preparing the wells and ending with evaluating the effectiveness and discussing the methods of hydraulic fracturing. Hydraulic fracturing is the process of pumping fluid into a wellbore at an injection rate that is too high for the formation to accept without breaking. During injection the resistance to flow in the formation increases, the pressure in the wellbore increases to a value called the break-down pressure, that is the sum of the in-situ compressive stress and the strength of the formation. Once the formation “breaks down,” a fracture is formed, and the injected fluid flows through it.

scholarly journals Numerical investigation of a new structural configuration of a concrete barrier wall under the effect of blast loads

2019 ◽  
Vol 11 (S1) ◽  
pp. 19-34
Author(s):  
Ahmed K. Taha ◽  
Zhengguo Gao ◽  
Dahai Huang ◽  
M. S. Zahran
Keyword(s):  
High Explosive ◽  
Numerical Models ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Blast Waves ◽  
Convex Curve ◽  
Structural Configuration ◽  
Explosive Material ◽  
Concrete Wall ◽  
Concrete Barrier

AbstractIn this study, a non-linear three-dimensional hydrocode numerical simulation was carried out using AUTODYN-3D, which is an extensive code dealing with explosion problems. A high explosive material (comp-B) is blasted against several concrete wall barriers. The model was first validated using referenced experimental tests and has shown good results. Several numerical models were carried out to study the effect of changing the shape of wall barrier from flat to convex curve and concave curve, and also investigated the effect of changing the angle of curvature. The results showed that changing the shape of a wall barrier from flat to convex curve has the best performance in mitigating the effect of blast waves. It is also concluded that convex walls with 60° angle of curvature have the best performance compared to other barrier walls.

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