Low-velosity detonation in ammonium perchlorate, its mixtures with polymethylmethacrylate and aluminum

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Abstract

The patterns of occurrence and propagation of low–velocity detonation (LVD) in ammonium perchlorate and its mixtures with polymethylmethacrylate and aluminum ASD-4 with a relative density of up to 0.98 in durable non-destructive shells when initiated from the blind end are determined. It is shown that the addition of polymethylmethacrylate to ammonium perchlorate facilitates the transition of burning to LVD. The influence of the size of the oxidizer particles, the diameter, and the structure of mixtures on the spread of LVD is revealed. It is established that the ignition and burning of aluminum in a mixture with 15% polymethylmethacrylate 75% ammonium perchlorate 10% ASD-4 with a porosity of 2% occurs ~ 6 microseconds after the passage of a shock wave through it.

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About the authors

V. E. Khrapovskii

Semenov Federal Research Center of Chemical Physics Russian Academy of Sciences

Author for correspondence.
Email: khrapovsky@mail.ru
Russian Federation, Moscow

References

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2. Fig. 1. Schemes of the used shells with an internal diameter: a – 16 mm, b – 41 or 61 mm: 1 – shell walls; 2 – internal channel; 3 – test sample; 4 – initiator; 5 – electric igniter; 6 – textolite sleeve; 7, 8 – holes for optical registration; 9 – electric wires from the electric igniter.

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3. Fig. 2. Photograph of the spread of luminescence during the development of NSD in a mixture of 15% PMMA + 85% AP (dр = 150 μm, øch = 15 mm, Lch = 203 mm, ρ = 1.59 g/cm3, m = 11%), recorded through holes with lead azide (experiment No. 231). RDX initiator — øign = 15 mm, Lign = 24 mm, ks = 1.0.

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4. Fig. 3. Diagrams of X(t) distribution of NSD in AP samples (ρch = 1.92– 1.93 g/cm3

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5. Fig. 4. Diagrams X(t) of the propagation of NSD along the length of the mixture of 85% PKhA + 15% PMMA:

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6. Fig. 5. Dependence of the detonation velocity of a mixture of 15% PMMA + 85% PHA on its relative density d = rch/rch,max: 1 – low-speed detonation; 2 – normal detonation.

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7. Fig. 6. Diagrams X(t) of the propagation of NSD along the length of the mixture of 15% PMMA + 85% PKhA for different charge diameters:

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8. Fig. 7. a – Photograph of the spread of luminescence during the development of NSD in a mixture of 15% PMMA + 75% PKhA (dр = 150 μm) + 10% ASD-4 in holes with lead azide (2nd, 4th and 6th luminous points from the lower edge of the image) and without it (1st, 3rd and 5th luminous points). Charge parameters:

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9. Fig. 8. Diagrams X(t) of the development of NSD along the charge length in samples of PEKA-54 cast fuel of different diameters:

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10. Fig. 9. Dependence of the NSD velocity (in m/s) in a sample of PEKA-54 fuel on the cross-sectional area of ​​the charge (in mm²).

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