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GAP/DNTF Based PBX Explosives: a Novel Formula Used in Small Sized Explosive Circuits

An C., Wen X., Wang J., Wu B.

Central European Journal of Energetic Materials

2016

Vol. 13, no. 2

397--410

With 3,4-dinitrofurazanofuroxan (DNTF) and glycidyl azide polymer (GAP) as the main explosive and binder respectively, GAP/DNTF based PBX explosives were designed, prepared and used to fill the small groove of some explosive circuits. The formulation was: DNTF 85 wt.%, GAP 11 wt.%, 2,4-toluene diisocyanate (TDI) and other additives making up the final 4 wt.%. After the uncured slurry mixture was prepared by uniform mixing, a squeezing device was used to charge the circuit groove (dimensions less than 1 mm × 1 mm). Scanning electron microscope (SEM) results showed a fine charging effect. Differential Scanning Calorimetry (DSC) was used to determine the energy of activation (Ea) and the pre-factor (A) of GAP/DNTF and these were compared with those for raw DNTF. The influences and causes of it have been investigated. The experimental results for propagation reliability showed that when the dimensions of the linear groove were 0.8 mm × 0.8 mm, 0.7 mm × 0.7 mm, 0.6 mm × 0.6 mm or 0.5 mm × 0.5 mm, GAP/DNTF based PBX explosives can propagate explosion successfully. Furthermore, the H50 and friction sensitivity of GAP/DNTF based PBX explosives were obtained using the following mechanical sensitivity experiments. These properties are vital if GAP/DNTF based PBX explosives are to be applied in complex explosive circuits.

Mathematical and computational modelling of fluid and fibre dynamics in a sifting air-laying process

Ingham D. B., Bradean R., Wen X., Russell S. J., Pourmohammadi A.

International Journal of Applied Mechanics and Engineering

2001

Vol. 6, no 2

287-309

In this study we develop a fundamental understanding of an aerodynamic method of forming fibrous web structures from short fibres. Computational fluid dynamics is employed to model the air flow in the system and based on this analysis the fibre dynamics in the process are then modelled. Experimental results were obtained by using high speed photography and we have found reasonable agreement between the theoretical predictions and the experimental findings.