Advanced Energetic Materials by National Research Council, Division on Engineering and

By National Research Council, Division on Engineering and Physical Sciences, Board on Manufacturing and Engineering Design, Committee on Advanced Energetic Materials and Manufacturing Technologies

Complex lively fabrics - explosive fill and propellants - are a severe expertise for nationwide defense. whereas a number of new promising innovations and formulations have emerged in recent times, the dept of security is worried concerning the nation's skill to take care of and enhance the data base during this sector. to help in addressing those issues, places of work inside of DOD requested the NRC to enquire and investigate the scope and well-being of the U.S. R&D efforts in full of life fabrics. This file presents that review. It offers numerous findings concerning the present R&D attempt and proposals aimed toward bettering U.S. functions in constructing new lively fabrics know-how. This research reviewed U.S. study and improvement in complicated energetics being carried out through DoD, the DoE nationwide laboratories, industries, and academia, from a listing supplied through the sponsors. It additionally: reviewed papers and expertise exams of non-U.S. paintings in complex energetics, assessed vital parameters, reminiscent of validity, viability, and the chance that every of those fabrics could be produced in volume; pointed out obstacles to scale-up and construction, and steered technical ways for addressing power difficulties; and, prompt particular possibilities, concepts, and priorities for presidency sponsorship of applied sciences and production procedure improvement.

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Navy researchers are likewise very interested in the use of layered propellants to enhance performance, but are also strongly motivated to find ways to reduce barrel erosion and thereby enhance barrel life. Both Army and Navy approaches employ advances in propellant-processing technologies that have matured significantly during the past decades. Additional details of these two research thrusts are discussed below. S. Air Force. CURRENT GUN PROPELLANTS All those who made presentations on gun propellants noted that over the past 30 years, the basic ingredients in fielded propellants have remained the same.

TRANSITION CHALLENGES The well-touted advantages of nanodimensional fuels and oxidizers appear against the backdrop of several disadvantages. In particular, the problem of aging of formulations containing nanoparticles is aggravated by the high surface area and the resulting higher reactivity of these particles. Oxygen and moisture cause a metal oxide to form on the particle surface, which leads to a loss of energy, lower reactivity, and added dead weight. Processing difficulties have been observed in the experimental development of nanoscale composites because the high surface area leads to problems such as drastically increased viscosity of formulations.

A key test in assessing the vulnerability of propellants is the pendulum test developed at ARL. In this test, a shaped charge jet attenuated through a conditioning plate of rolled homogeneous armor challenges a propellant sample (see Figure 6-4). The violence of the reaction is then compared with a baseline such as JA2 (a nitrocellulose gun propellant 5 6 Joseph A. Lannon, RDC/Picatinny. 2001. Presentation to the committee. July 31. N. Eldredge, Picatinny Arsenal. 2001. Presentation to the committee.

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