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FRONT CURVATURE RATE STICK MEASUREMENTS AND DETONATION SHOCK DYNAMICS CALIBRATION
 

Summary: FRONT CURVATURE RATE STICK MEASUREMENTS
AND DETONATION SHOCK DYNAMICS CALIBRATION
FOR PBX 9502 OVER A WIDE TEMPERATURE RANGE
L.G. Hill, J.B. Bdzil, T.D. Aslam
Los Alamos National Laboratory
Los Alamos, NM 87545
Detonation velocities and wave shapes were measured for PBX 9502 (95
wt.% TATB, 5 wt.% Kel­F 800) rate sticks at the temperatures ­55, 25, and
75 C. At each initial temperature T 0 three diameters were fired: 50 mm, 18
mm, and 8, 10, and 12 mm respectively for the hot, ambient, and cold sticks.
Wave shape data were fit with an analytic form, and the fitting parameters
are listed along with thermal expansion and diameter effect data. For each
T 0
, the simplest detonation shock dynamics model assumes that the local
normal wave speed Dn depends only on the local total curvature Ÿ. The
data confirm this notion for small Ÿ, but curves for different charge diameters
diverge at large Ÿ. For each charge diameter, waves propagated more ideally
in hotter charges than colder ones. For each T 0 a single best Dn (Ÿ) curve was
found by global optimization. From these a Dn (Ÿ; T 0 ) calibration surface was
generated to allow computation of problems with temperature gradients.

  

Source: Aslam, Tariq - Los Alamos National Laboratory

 

Collections: Physics