446 
tional to vane the momentum to #€ , and the energy flux to Te ae 
In order to estimate YC , it is, of course, necessary to use the de- 
tails of the theory of the preceding discussion since *# is not 
specified in any way by the asymptotic theory. 
7. Calculation of Pressure-Time Curve. 
We now proceed to outline on the basis of the theory of 
the propagation of the kinetic enthalpy a scheme for calculating 
the pressure-time curve of the shock wave produced at a distance 
R from an explosive and to list typical results of such calculations. 
The formulas necessary for this calculation can be assembled at once 
from the foregoing sections of this report. We shall restrict our- 
selves to the peak approximation to G,(t), since although it distorts 
the tail of the shock wave somewhat, it leads to a particularly simple 
set of formulas which are probably adequate for engineering calculations 
requiring estimates of the intensity and duration of the initial pres- 
sure pulse. More elaborate formulas based upon the more refined ex- 
pression for Ga(t) of Eq. 4.18 may be readily set up when desired. 
The peak formula for G,(t) is obtained in complete form 
from Eqs. 4.9 and 4.19, 
7] 
e| & 
o 
a Y 
ee 
<a 
ome if 
a 
t 
lo ¥ 
cs 
\ 
rE a 
a on (7.1) 
: C+u Ene “a 
i% uC, [ + Gy, > ele 
™ ant Atal rh €,-t, J 
ees ¢, -k, & 2 3 
bly iets | - Se) eo ey ae 
ow) ¢, + u, a a+ u, 2 
