Skidmore Hart

The following description is given by I.C. Skidmore S. Hart on pp 47-51 of Ref 15, except that some caps are replaced with small letters to be comparable with designations given by Cook 

Theory. If p is pressure, v - specific volume, e - specific internal energy, D detonation velocity, u - particle velocity, C - sound velocity, y - adiabatic exponent and q -specific.detonation energy, the velocity of propagation and particle velocity immediately behind any plane detonation wave in an explosive, defined by initial conditions, pD, v0, eQ, and uQ, are given by the first two Rankine-Hugoniot relations  

The pressure and volume of the detonation products immediately behind the detonation front are related by the third Rankine-Hugoniot equation which defines the 

If the detonation products obey a poly-tropic gas equation of state, then  

For a steady unsupported detonation wave with properties designated by subscript 1, the C-J condition is  

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Unfortunately, the extensive work on gas detonations has had little impact on the development of the theory for condensed phas es. The reason is the lack of a reliable equation of state for these. While fundamental significance must be achieved eventually, an empirical fit to actual performance would be helpful at present. A sophisticated general equation for the isentrope, which is a C-J isentrope, is called for. Above 150-200 kbar, the polytropic (gamma-law) equation of state is valid (Skidmore Hart, in Ref 19, p 47). 

In experiments of Skidmore Hart, the overdriven detonation waves were generated by an "explosive driven plate impact technique , which was essentially as follows (Ref 15, p 48) ... 

Then a final apparently steady, deton was established at 8280 m/sec 4) Skidmore Hart (Bet 88) produced overdriven detonation waves in Comp B carrying increased velocities and pressures up to twice the C-J pressure by an explosive driven plate impact technique. The basis of the technique is to explosively propel a metal driver plat e at a similar target plate on which rests a sample layer of expl backed by a further layer of inert solid. When the driver plate vel is sufficiently high this process generates a steady overdriven deton wave in the expl unless (or until) it is overtaken by the rarefaction wave from the rear of the driver plate. 

Gordon, "Detonation Limits in Composite Explosives , lOthSympCombstn(1964), pp 833-38 3) I.C. Skidmore S. Hart, "The... 

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