Velocity — Temperature Initial of Charge Relationship

Detonation Velocity-Temperature (Initial) of Charge Relationship. Accdg to Calvet (Ref latests conducted at Univ of Marseille with some HE s, have shown that deton vels detd by Dautriche method, increased with an increase in initial temps. Following table presents the results  

Note PA primers were used in each test. A specially constructed device was used for measuring vels of molten samples, such as at temps of 173 183°all the above expls, except PA. Extremely high vel for TNN at 183° was due to decompn of chge prior to initiation McGarry Stevens (Ref 2) detd by drum camera method the rates of deton of Tetryl, RDX Comp A-3 (all in pelleted form) 50/50 Pentolite, TNT Comp B (all cast) and hand-tamped Comp C-4. The rates of these sticks 1-1/8 inch in diam by 18 inches long were measured after exposure to initial low, ambient and high temps. It was found that the deton rates of these expls, 

Andreev Belyaev (Ref 5) conducted similar studies in Russia by detonating powdery expls in thin-walled lead tubes 1 2.5mm in diam at temps of +25°, -80° -183. Their results are given in the following Table  

This table shows that fluctuations in velocities are greater at lower temps, but averages are practically the same at low and at room temp. The fact that vel of Amm Pictate at low temp is higher than at RT is probably due to an increase in density on freezing (the densities shown in the table were detd at RT and they must be higher at -80° —180°) 

Tests with some cast expls have shown that velocities increased slightly with lowering of temp. This was shown to be due to increase in density. In case of liquids increases in velocities at low temps were more noticeable because their densities increased considerably with lowering of temp. 

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Detonation Velocity, Influence of Temperature (Initial) of Charge on. See Detonation Velocity-Temperature (Initial) of Charge Relationship... 

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