Transients and Unstable Detonation Processes

Detonation Transients and Unstable Detonation Processes. Allen et al (Ref 1) made detonation velocity vs chge length. measurements on RDX (—65+100 mesh), fine grained TNT (—35 —150) coarse, low-density TNT (—8+10) 50/50 fine-coarse TNT, cast TNT, low-density. mixts of 80/20 TNT/AN, and mixts of 90/10 AN/RDX. Deton velocities were measured by a rotating mirror streak camera and by the pin oscillograph technique, in most cases simultaneously Their exptl data showed six different types of velocity transients  

2) Dual discontinuous transitions from constant or nearly constant velocity regimes. This type of transient was observed in cast TNT, fine grained TNT, and in coarse grained TNT (not previously observed) 

3) Decaying velocity. A commonly observed type of transient associated with. overbooster-ing and/or with fading deton, but seldom over such. a long distance as observed in this study with.coarse TNT 

4) Smoothly accelerating velocity-transient stabilizing at L /d = 3(+l). LD =end of vel transient and beginning of stable vel, d = diameter in cm. This type of transient, predicted by the deton head model and characteristic of non-ideal deton in point initiated chges, was observed in low density 80/20 AN/TNT, 90/l0 AN/RDX mixts, and in 50/50 cast Amatol 

5) Combination of type 2) and type 4). This type of transient was observed in low density 50/50 fine-coarse TNT and in low density 80/20 AN/TNT in the smaller diam chge 

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Detonation (and Explosion), Unstable, See Detonation (and Explosion), Steady and Nonsteady State in and also Detonation (and Explosion), Transients and Unstable Detonation Processes... 

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