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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2012005315
pages 437-453

OPTIMIZATION OF THE MECHANICAL AND COMBUSTION PROPERTIES OF A NEW GREEN AND INSENSITIVE GUN PROPELLANT USING DESIGN OF EXPERIMENTS

Catalin Florin Petre
Defence Research and Development Canada – Valcartier, Québec, QC, G3J 1X5, Canada
Frederick Paquet
General Dynamics−Ordnance and Tactical Systems (GD-OTS), Canada Valleyfield, Valleyfield, Canada
Charles Nicole
Defense Research and Development Canada (DRDC), Valcartier, Quebec, Canada
Sylvie Brochu
Defence Research and Development Canada (DRDC) Valcartier Research Center Quebec, Canada G3J 1X5

RÉSUMÉ

A Mixture DOE plan was designed to optimize the formulation of a new low-vulnerability ammunition (LOVA) propellant by maximizing both its mechanical and combustion properties when compared to a reference (M1-0.025) propellant. The main ingredients of the LOVA were octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), nitrocellulose (NC), cellulose acetate butyrate (CAB), acetyl triethyl citrate (ATEC), and a stabilizer. The low-high levels of each varied parameter were 5.7−14% for NC, 3.7−12% for CAB, and 8.3−10.3% for ATEC, while the HMX was fixed at 72%. The mechanical properties (Young's modulus, YM, expressed as relative percentage to M1 modulus) of the propellant grains were measured using a drop-weight test (DWT). The regression model for this parameter consisted of three main effects and one double interaction. The optimal region for the YM corresponded to a composition as follows: NC ≥ 14.0%, CAB = 3.7−5.7%, and ATEC = 8.3−10.3%. The combustion properties (relative quickness, RQ, and burning rate, BR), expressed as percentage of the M1 reference propellant, were measured using a closed vessel. The optimal composition with regard to RQ and BR was located in the region NC = 10.0−13.0%, CAB = 3.7−8.0%, and ATEC = 8.3−10.3%. On the basis of the analysis of the two surface responses, there is a region where the mechanical properties are good (~81%) and the RQ is very close to the targeted value (103%). Accordingly, a new optimized propellant was formulated and showed a measured Young's modulus of 89% and an RQ of 111%, both relative to the properties of the M1-0.025 propellant.


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