Unconfined detonation velocity

Brisance. Sand test, 56.9g vs 53.0 for Pentolite and 43.0 for TNT plate dent test, method B, 141% TNT for cast un confined PTX-2, u 1.71g/cc Compatibility with metals. Does not affect Al, dry or wet does not affect mild steel, dry Detonation velocity. 8000—8065m/sec for an unconfined cast charge 1 inch in diam, d 1.70 g/cc vs 7500m/sec for Pentolite and 6900m/sec for TNT... 

Brisance. Sand test, 58.5g vs 43.0 for TNT Detonation velocity. 7910m/sec for a cast, unconfined sample 1.0/ diam at d 1.60g/cc Explosion temperature. No cap used 375°... 

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... 

Explosive Characteristics Detonation Velocity For one-inch-diam unconfined charges the following deton velocities, D, were obtained (Ref 2) ... 

PETN. We discuss detonation and wall expansion velocity, along with diameter effect information in unconfined rate stick tests. The detonation velocity of ETN is 99% that of PETN in the same test setup, showing that performance properties are very similar for the two nitrate esters. 

Small scale, unconfined detonation rate sticks were tested at 3.00 0.03 mm and 6.35 0.03 mm pellet diameters. The ETN pellets were pressed to an initial average density of 1.74 0.01 gem 3 (98% TMD), and pellet expansion was not measured thereafter. These measurements gave a detonation velocity of 7.90 0.13 and 8.03 0.04 mmps 1 at 3.00 and 6.35 mm respectively, which are within uncertainty of the adjusted detonation velocities observed in the cylinder tests, given in Table 1. These velocity measurements demonstrate a critical diameter for ETN of <3 mm, which is consistent with the PETN critical diameter of<1 mm [9]. 

Erythritol tetranitrate is a melt-castable, high-performance nitrate ester explosive that has recently become important due to its use in homemade explosives. We have investigated the detonation behavior of ETN using cylinder tests and small diameter unconfined rate sticks. Similar performance properties were observed between ETN and the closely related nitrate ester, PETN detonation velocities for the two... 

The detonation velocities of confined and unconfined nitroglycerine and nitroglycol explosives have very different values these values are known as upper and lower detonation velocities respectively. The velocity measured in a steel pipe confinement is not attained in a borehole. Special seismic explosives (e.g. - Geosit) detonate at the same high detonation rate as measured in the steel pipe, whether confined or not. 

Detonation Velocity - 7570 m/sec for pressed unconfined sample 1.0 inch diam of density 1.49 22 P 150) Blatt (Ref 7a) gave... 

Detonation Velocity is the most Important property to consider when rating an explosive. It may be expressed as either confined or as unconfined. Experimental procedures for detn of velocity are described in Vol 4, D629 to D640. The confined velocities for blasting expls vary from 5000 to 25000 fps. For blasting in hard rock, high-velocity expls with inherent hi ... 

From the magnitude of the pressures (Table XII) it appears that the velocities (Table XI) are likely to be the hydrodynamic detonation velocities for the confined samples. No pressure measurements were taken with the unconfined pellets and so the reported velocities of 2-3 km/sec may not be true detonation. 

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