Shock Pressure in Detonation and Its Measurements

Detonation, Shock Pressure in and Its Measurements. A brief definition of shock pressure is given under Detonation, Shock, Shock Effect, etc. Besides shock pressure, known also as spike pressure, there is also the pressure at the end of the reaction zone (See Detonation, Reaction Zone in). The latter pressure is known as Chapman-Jouguet Pressure or C-J Detonation. It is explained under Detonation, Chapman-Jouguet Parameters and also under Detonation (and 

The pressure jump necessary to initiate detonation in various expls does not belong under this heading. This has been discussed under Detonation (and Explosion Initiation - - - - in Explosive Substances . The actual value of the required jump seems to be 25-50 atm (Ref 9). 

By classical C-J theory, the spike pressure is twice the C-J pressure, but some scientists think that it is not as high Cook s school thinks that the spike pressure is very little, if at all, higher than the C-J pressure (Ref 5, pp 68-9 79-80  

Shock pressures can be measured by the same methods as detonation pressures are determined (Ref 1) and also by the methods described under DETONATION 

Jaffe et al, AmRocketSocJ 32, 22-5 (1962) CA 56, 11872 (1962) (Determination of shock pressure required to initiate detonation of an acceptor in the shock sensitivity test) 9) C.G. Dunkle, private communication, March 1968 

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