6 THE SEQUENCE OF EVENTS 



rapidly as the wave advances outward and the pressure falls to "acous- 

 tic" values. 



(ii). The pressure level in the spherical wave falls off more rapidly 



34,000 LB /IN 



3400 LB/IN 



2200 LB/IN 



CENTER 



5 FEET 



50 FEET 



490 



340 LB/IN- 



160 LB/IN' 



495 



500 FEET 



(o) R = 5 FEET 



(b) R = 50 FEET 



(c) R » 500 FEET 



Fig. 1.1 The pressure distribution around a 300 pound TNT charge at 3 

 times after completion of detonation. 



with distance than the inverse first power law predicted for small ampli- 

 tudes, but eventually approaches this behavior in the limit of large 

 distances. 



, 2200 LB/IN^ 



R • 50 FEET 



R-500 FEET 



. 160 LB /IN 



REFLECTIONS 



A- 



1.5 



TIME (milliseconds) 



Fig. 1.2 Shock wave pressure-time curves at 2 distances from 300 pound 



TNT charges. 



