A Comparison of Different Ni+Al Structural Energetic Materials

2013 ◽  
Vol 1521 ◽  
Author(s):  
B. Aydelotte ◽  
N.N. Thadhani
Keyword(s):  
Energetic Materials ◽  
Impact Tests ◽  
Reactive Materials ◽  
Microstructure Morphology ◽  
Structural Energetic Materials

AbstractA comparison of different Ni+Al reactive materials is conducted to elucidate the effects of microstructure morphology on performance. CTH, a multi-material Eulerian hydrocode, was utilized to study mesoscale deformation during simulated rod-on-anvil experiments. It is found that the cold sprayed Ni+Al, which has a more topologically connected nickel phase, is likely to be more reactive because of enhanced deformation in the Ni phase relative to explosively compacted Ni+Al, where the Ni phase undergoes less deformation. Rod-on-anvil impact tests verify that cold sprayed Ni+Al is indeed more reactive than explosively compacted Ni+Al when subject to impact.

Shear Initiated Reactions in Energetic and Reactive Materials

2005 ◽  
Vol 896 ◽  
Author(s):  
Denise Meuken ◽  
Maria Martines Pacheco ◽  
Ries Verbeek ◽  
Richard Bouma ◽  
L Katgerman
Keyword(s):  
Shear Deformation ◽  
Energetic Materials ◽  
Large Scale ◽  
Reaction Rate ◽  
Large Deformations ◽  
Energetic Material ◽  
High Explosives ◽  
Reactive Materials ◽  
Fundamental Understanding

AbstractDeformation of energetic materials may cause undesired reactions and therefore hazardous situations. The deformation of an energetic material and in particular shear deformation is studied in this paper. Understanding of the phenomena leading to shear initiation is not only necessary to explain for example the response of munitions to intrusions or large deformations imposed in storage and transportation accidents. A fundamental understanding of shear initiation also provides the opportunity to initiate energetic materials in a different and controlled manner, and possibly with a tailored reaction rate of the material. Several small and large scale experiments have been performed in which a shear deformation is imposed onto high explosives as well as thermite based reactive materials. Experiments are numerically simulated in order to correlate small and large scale experiments and understand the initiation mechanisms.

Estimating the Relative Energy Content of Reactive Materials Using Nanosecond-Pulsed Laser Ablation

MRS Advances ◽  
2018 ◽  
Vol 3 (17) ◽  
pp. 875-886 ◽  
Author(s):  
Jennifer L. Gottfried ◽  
Steven W. Dean ◽  
Eric S. Collins ◽  
Chi-Chin Wu
Keyword(s):  
Energy Release ◽  
Energetic Materials ◽  
Energy Content ◽  
Energetic Material ◽  
Scale Up ◽  
Plasma Chemistry ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Temperature Plasma ◽  
Reactive Materials

ABSTRACTRecently, a laboratory-scale method for measuring the rapid energy release from milligram quantities of energetic material has been developed based on the high-temperature plasma chemistry induced by a focused, nanosecond laser pulse. The ensuing exothermic chemical reactions result in an increase in the laser-induced shock wave velocity compared to inert materials. Laser-induced air shock from energetic materials (LASEM) provides a method for estimating the detonation performance of novel organic-based energetic materials prior to scale-up and full detonation testing. Here, the extension of LASEM to non-organic energetic materials is discussed. The laser-induced shock velocities from reactive materials such as Al/PTFE, Al/CuO, Al/Zr alloys, Al/aluminum iodate hexahydrate, and porous silicon composites have been measured; in many cases, the high sensitivity of the samples resulted in propagation of the reaction to the surrounding material, producing significantly higher shock velocities than conventional energetic materials. Methods for compensating for this effect will be discussed. Despite this limitation, the relative comparison of the shock velocities, emission spectra, and combustion behavior of each type of material provides some insight into the mechanisms for increasing the energy release of the material on a fast (μs) and/or slow (ms) timescale.

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
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