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2 Central European Journal of Energetic Materials

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Local Temperature Sensitivity Coefficients of a Deterred Spherical Single Base Gun Propellant

Boulkadid K., Lefebvre M. H., Jeunieau L., Dejeaifve A.

Central European Journal of Energetic Materials

2017

Vol. 14, no. 4

952--965

In our previous investigation, we measured the global temperature sensitivity coefficient of a deterred spherical single base gun propellant following an experimental procedure that did not allows us to determine the local temperature sensitivity coefficients of the deterred and undeterred parts of the investigated propellant. In this paper, we propose an experimental methodology to measure the local temperature sensitivity coefficients of both parts of the spherical deterred gun propellant. This methodology can be summarized as follows: Firstly, we separated the ranges of pressure where the combustion of the deterred and the undeterred parts of the spherical propellant occurs by means of infrared (IR) microscopy measurements. Then the burning rate of the propellant as a function of pressure was calculated according to STANAG 4115 at different initial temperatures. Finally, we determined the local temperature sensitivity coefficients of each part of the spherical propellant.

Quantitative Infra-Red Microscopy Method for the Determination of the Deterrent Diffusion Activation Energy in a Spherical Propellant

Jeunieau L., Lefebvre M. H., Guillaume P.

Central European Journal of Energetic Materials

2007

Vol. 4, nr 1-2

109-124

A calibration procedure for quantitative determination of dibutylphthalate concentration in a double base propellant is established. The best results are obtained by dividing an absorption band, characteristic of the dibutylphthalate, by an absorption band characteristic of the double base mixture. The influence of the nitroglycerin concentration on the linear calibration curve is investigated and it is shown that a linear relationship can be obtained for different concentrations of nitroglycerin by multiplying the absorbance ratio by the nitrocellulose concentration. The developed analysis protocol is applied to characterize quantitatively the deterrent concentration profile of a flattened ball propellant. Since the measured profile in a given propellant grain is dependent of the orientation of the analysed cross-section, geometrical and concentration factors are used to eventually describe the profile perpendicularly to the grain surface. The validated experimental procedure is then applied to study the characteristic of the diffusion process of the deterrent throughout the grain by artificial ageing at different temperatures. From these results, diffusion coefficients and diffusion activation energy of 154 ± 15 kJ/mol have been obtained. Furthermore, a simulation program has been used to validate the used procedure for the calculation of the diffusion coefficient.