Charge diameter 3-

Energy Release in Detonation of Aluminized Explosives. Part I. Effect of Confinement and Charge Diameter on the Detonation Velocity of Minol 2 , ARDE Report 616/44 (July 1944) 30) Anon, Studies of the Preparation,... 

Undoubtedly the most frequently and accurately determined detonation parameter of any expl is its detonation velocity, D. This is certainly true for PETN, Detonation velocity varies with packing density, p, charge diameter, d,... 

Cartridge (or Charge) Diameter - Detonation Velocity Relationship. See under Detonation Velocity... 

Fra I Detonability limits in the charge diameter-porosity plane, Group 1. Example shown is TNT (grain site 0.07 to 0.2 mm) data (Ref i)... 

Dr Price also examined relations between (A) and deton velocity (D). They are presented in Fig 3 for group 1 and in Fig 4 for group 2 Fig 3 shows a representative of group 1, an unconfined cylindrical charge of HBX-1 (RDX/TNT/A1/Wax - 40/38/17/5). Its voidless density is 1.76 g/cc. The curves are for charge diameters d, d, d d which are 6.4, 12.7, 25.4 50.8 mm, respectively. Solid lines are smoothed values from the experimental data which have been extrapolated to A=0.6. The limit line for failure was estimated, as shown on p 694 of Ref 17. A pattern of the same type was previously obtd by Stesik Akimova (Ref 3) for TNT... 

Fig 4 shows an unconfined cylindrical charge of Ammonium Perchlorate, which represents group 2. Its particle size is 10 microns and the charge diameters examined dj,... 

Fig 4 Patters of detonation velocity vb porosity curves at various charge diameters, Group 2. Example shown is AP (average particle sue 10 n) data... 

Detonation-Critical and Limiting Charge Densities, Charge Diameters and Detonation Velocity Relationships. See under DETONATION VELOCITY-CHARGE DIAMETER-DENSITY RELATIONSHIPS... 

Jones assumed. It has, in fact, been shown experimentally by Herzberg et al (Ref 2, p 119) that the detonation wave fronts are curved and that the curvature increases as the charge diameter is reduced. A simple method by which this,curvature can be illustrated is provided by the use of a high-speed Streak Camera (same as "Smear Camera" described in Vol 2 of Encycl, p C16-L). 

See under Detonation Velocity-Charge Density Relationship and Detonation Velocity-Charge Diameter Relationship... 

Investigation of the influence of confinement on the total end effect, has shown that in the range of diameters between ca 1.5 and 2 inches, the maximum effective confinement obtainable with steel was reached with a tube ca 0.5 inches thick. Also, it was found that with maximum confinement the effective charge length Lm in this range of diameters increased only ca one charge diameter above that of unconfined charges, while the total end effect about doubled... 

The strong influence exerted by many of these factors, particularly degree of confinement and charge diameter, shows that the energy release which is initiated in the detonation front does not occur instantaneously. Hence, any theory must take account of the lateral expansion [See Detonation (and Explosion), Lateral Expansion in, etc]... 

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