Shock-Induced Chemical Reactions in Structural Energetic Materials

2006 ◽  
Author(s):  
V. Narayanan
Keyword(s):  
Chemical Reactions ◽  
Energetic Materials ◽  
Structural Energetic Materials

Shock-Induced Chemical Reactions in Multi-Functional Structural Energetic Intermetallic Nanocomposite Mixtures

Aerospace ◽  
2005 ◽  
Author(s):  
V. Narayanan ◽  
X. Lu ◽  
S. Hanagud
Keyword(s):  
Metal Oxides ◽  
Chemical Reactions ◽  
Energetic Materials ◽  
Thermal Loading ◽  
Volume Fraction ◽  
Irreversible Thermodynamics ◽  
Irreversible Processes ◽  
Finite Difference Schemes ◽  
Dual Functional ◽  
Metal Metal

Shock induced chemical reactions of intermetallics or mixtures of metal and metal-oxides are also used to synthesize new materials with unique phases and microstructures. These materials are also of significant interest to the energetics community because of the significant amount of heat energy released during chemical reactions when subjected to shock and/or thermal loading. Binary energetic materials are classified into two categories— metal/metal oxides and intermetallics. When these materials are synthesized at a nano level with binders and other structural reinforcements, the strength of the resulting mixture increases. Thus, these materials can be used as dual-functional binary energetic structural materials. In this paper, we study the shock-induced chemical reactions of intermetallic mixtures of nickel and aluminum of varying volume fractions of the constituents. The chemical reaction between nickel and aluminum produces different products based on the volume fraction of the starting nickel and aluminum. These chemical reactions along with the transition state are modeled at the continuum level. In this paper, the intermetallic mixture is impact loaded and the subsequent shock process and associated irreversible processes such as void collapse and chemical reactions are modeled in the framework of non-equilibrium thermodynamics. Extended irreversible thermodynamics (EIT) is used to describe the fluxes in this system and account for the associated irreversible processes. Numerical simulations of the intermetallic mixture are carried out using finite difference schemes.

Achieving tunable chemical reactivity through photo-initiation of energetic materials at metal oxide surfaces

2020 ◽  
Vol 22 (43) ◽  
pp. 25284-25296
Author(s):  
Maija M. Kuklja ◽  
Roman Tsyshevsky ◽  
Anton S. Zverev ◽  
Anatoly Mitrofanov ◽  
Natalya Ilyakova ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Chemical Reactions ◽  
Energetic Materials ◽  
Chemical Reactivity ◽  
Energetic Material ◽  
Oxide Surfaces ◽  
Oxide Interfaces ◽  
Metal Oxide Surfaces

Photo-stimulated chemical reactions in energetic materials can be highly controlled by selectively designing energetic material – metal oxide interfaces with tailored properties.

Chemical Reactions and Other Behaviors of High Energetic Materials under Static Ultrahigh Pressures

2004 ◽  
Vol 465-466 ◽  
pp. 189-194 ◽  
Author(s):  
Naoyuki Goto ◽  
Hiroshi Yamawaki ◽  
Kenichi Tonokura ◽  
Kunihiko Wakabayashi ◽  
Masatake Yoshida ◽  
...  
Keyword(s):  
Chemical Reactions ◽  
Energetic Materials

EQUATION OF STATE & FAILURE CRITERIA OF DUAL FUNCTIONAL STRUCTURAL ENERGETIC MATERIALS

2008 ◽  
Author(s):  
S. Hanagud ◽  
X. Lu ◽  
R. Zaharieva ◽  
Mark Elert ◽  
Michael D. Furnish ◽  
...  
Keyword(s):  
Equation Of State ◽  
Energetic Materials ◽  
Failure Criteria ◽  
State Failure ◽  
Dual Functional ◽  
Structural Energetic Materials

scholarly journals Improvement of Composite Propellants Energy Using Explosive Materials

2021 ◽  
Author(s):  
Amjad O. Saeed ◽  
Nagmeldin M. Elamin
Keyword(s):  
Chemical Reactions ◽  
Energetic Materials ◽  
High Pressures ◽  
Specific Impulse ◽  
Significant Positive Effect ◽  
Explosive Material ◽  
Composite Propellant ◽  
Explosive Materials ◽  
High Pressures And Temperatures ◽  
Positive Effect

Composite propellants are energetic materials have ability to ignite, burn fast and cause several simultaneous exothermic chemical reactions which produce huge amounts of gases under high pressures and temperatures which can spread spontaneously. 1n the present study, the explosive material hexogen (Cyclo tri-methylene tri-nitramine) was used to improve the performance properties of composite propellants, especially the specific impulse. For several formulations of hexogen at different added percentages, the specific impulse was calculated using thermodynamic calculations program of composite propellants. The results given were compared with those formulations not including hexogen. It was seen that; hexogen caused a significant positive effect in the specific impulse. Accordingly, the energy of composite propellant was improved positively in the samples containing hexogen till 40% of the oxidizer ratio. Also, it was noticed that the specific impulse began to decrease gradually for the oxidizers containing more than 40% of hexogen which caused in a decreasing of composite propellant energy. Finally, it was concluded that, the use of some amount of explosive materials like hexogen can improve composite propellants energy successfully.

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