Propagation Through Explosive Charges

Detonation (and Explosion), Propagation Through Explosive Charges. In addn to information and references given under Detonation (and Explosion), Initiation (Birth) and Propagation (Growth or Spread) in Explosive Substances , following refs should be consulted  

Refs 1) Ya.B. Zel dovich, ZhEksper i TeoretFiz 10, 542(1940) (On the theory of propagation of detonation in gaseous systems) la) J.G. Kirkwood S.R. Brinkley Jr, Theory of Propagation of Shock Waves from Explosive Sources in Air and Water , OSRD 4814(1946) 2) G.N. Abramovich  

1 in ID, 6in long was studied at Aberdeen PG by means of optical recording technique) 

Tests were conducted with unconfined columns (paper covering), 38 in long placed 

The upper end of column was provided with a Fuze. If deton propagated whole length of the column, an impression was made on the steel plate 

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Transmission of Detonation Through Explosive Charges. See Ability to Propagate Detonation in Vol 1, p VII... 

Transmission of Detonotion Through Explosive Charge(Extent of Propagation of Explosion). See Ability to Propagate Detonation, in this section, ... 

Seismic techniques, the reflection and refraction of sound or shock waves propagated through the earth, are also used to reveal details of the structure and interrelationship of various layers in the subsurface. The shock or sound waves record densities in the earth s surface that may indicate an oil or gas reservoir. Explosive charges or vibration devices are used to impart the required shock wave. 

Detonation (and Explosion), Propagation Through Layers of Non-explosive Substances Between Explosive Pellets. This problem was investigated at the USBurMines and reported by C.M. Mason et al, Progress Rept Oct-Dec 1950. A brief description of this work is given under " Detonation (and Explosion) by Influence, 1 Ref 12 Note The non-explosive layers between explosive charges are known as barriers... 

This mixture is a big step up from the ANFO recipe. By substituting a little bit of hydrazine and water for the fuel oil in the ANFO recipe, an explosive results which has a detonation rate roughly double that of ANFO. This mixture can be directly detonated with a larger 6 cap or larger, and the explosive wave propagates itself well through the mixture. That means that one is not limited in the diameter or the explosive charge which can be constructed. 

When the propagation of the detonation through an explosive charge is recorded by means of a streak camera, the detonation wave front distance-time curve is obtained. A typical record is shown schematically in Figure 4.8. 

Tlie principle of the continuous determination of detonation velocity is based on the continuous oscilloscopic recording of an electric resistance change of special types of probes through which constant current flows, caused the detonation wave propagation through the test explosive charge. 

Compaction by man-made explosions can also be employed to density loose liquefiable deposits. By detonating explosive charges placed at various depths in boreholes across the site in a controlled manner, the explosions propagate dynamic shear stresses through the ground which can induce liquefaction. The postliquefaction consolidation following the... 

It has been found that upon detonation, an explosive can cause a nearby sample of explosive to detonate sympathetically. The distance over which one charge can detonate another is a function of the amount of energy produced by the first explosion and the medium through which the shock wave is propagated to the second charge of explosive. For instance, the relationship for air (very approximately) would be expected to be weight of explosive in lbs/(distance in ft)3 = 4. Thus, to calculate the maximum distance for a possible sympathetic detonation of 40,000 lbs of explosive, the calculation is ... 

Radial losses of mass, momentum, and energy through the lateral surface of the cylinder do not occur. The detonation wave propagates along the axis of the cylindrical charge and is confined laterally by the infinite diameter explosive (the minimum diameter which can support hydrodynamic detonation at its maximum steady-state rate). 

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