Chopter 2
EXPERIMENT
DESIGN
‘To: understand better the blast-wave parameters associated with
the damage noted on Shot 10 of UPSHOT-KNOTHOME, a total of 27 1/4-ton
trucks were used for exposure on Shots 3 and 6 of CASTLE in a pressuretime field expected to be that of a classical shock wave. The ground
ranges were selected to obtain dynamic pressures comparable to those
acting upon jeeps experiencing light to severe damage on Shot 10. In
term. of values of side-on or static pressures, the region of interest
for exposure of jeeps was 6 to 25 psi, based on the ideal pressuredistance curve. Within the vicinity of each station, static and
dynamic pressures were measured. Dynamic pressures were also caiculeted from measured static pressures using the following relation:
1 y2
P, = 2.5 (Ps) we
where:
P
(2.1)
=
The study of the effect of positive duration (see Appendix A)
indicated a lowering of pressure for specific.damage to drag-type
targets for the large yield of weapons.
Firther insight into this
effect was to be obtained from results of these tests.
Damage evaluation of vehicles was in accordance with the »pro-
cedures for UPSHOT-KNOTHOLE.
That is, damaged items were classified
in terms of echelon of maintenance and time to reetore to combat use.
2.2
FIELD LAYOUT
A total of 12 1/h-ton vrucks were exposed on Shot-3.
Table 2.1
presents the vehicle stations and the pressures expected from.the
estimated average yield and the estimatcd maximum yield.
Within the
pressure range indicated in Table 2.1, damage to vehicles was.‘expected
to be between moderate ana severe for any value of yleld from‘the
estimated average to the estimated maximum.
15
Placement of vehicles in