dynamic pressure which are related to measured overpressure oy use of
the Rankine-Hugo-iot relation, Equation 2.1 were recorded for each
specific damaged sustained by the Jeeps.
Comparing damage of Shot 6
(CASTLE) with Shot 10 (UPSHOT-KNOTHOLE) as a function of dynamic
pressure as shown in Fig. 4.2 indicates the damage to jeeps on Shot 10
correlate better with the ideal dynamic pressure than with the values
measured by Sandia Corporation (use Reference 4).
The measured values
of dynamic pressure cn Shot 10 are questionable.
This comparison
suggests that the probability curves for damage to Jeeps (see Reference
1) are Valid since ideal dynamic pressures were used for correlation
withdamage in the statistical analysis conducted.
Up to: now no mention has been made of the effect of positive
duration on: damage to jeeps. Intuitively, it can be expected that if
"2 TABLE 4,2 Danage Comparioon Between Shot 10 (UPGHOT>KNOTHOLE)
“-| and Shot 6 (CASTLE) Cor 1/4-Ton Trucks, Side-oa
Sot 10
Distaace
ft
1se2
1600
x
2415
2rT0
iat
Station
180,18
180.19
286,20
| 180.22
* Measured P-D
‘Curve
Pr, |
Pat
:
9.6
9.5
8.5
10.9
12.0
Yéeal P-D
Curve
’,
Degree of
Desage
Displacanant
(ft)
Pa
.
312
72
7.8
17.7
|e
Distance
m1
7,900
we
280
8,500
360
9,000
15,090
_
290
TS
a force of sufficient magnitude to’ cause motica acts on a target for
a long period of time, the damage will be greater:than for an equivalent force acting on the target for a shorter period of time. The
treatment <f the effect o! positive duration is given: in Appendix A.
It is shown that as the yield of weapon increases the: dynamic pres-
sure for © give displacement decreases. Fiw, dispiacement and dam-:
age of a vehicle are related. It can be expected that the:larger
displacements of a vehicle will cause greater damge. Therefore, for
the same level of damage the dynamic pressure will be higher oma
low yield weapon than from a high yield weapon. In view of this, the
dynamic pressure on Shot 10 could have been bigher than the ideal:
dynamic pressure even though the comparison of the damage made between
Shot 6 and Shot 10 implies that the ideal dynamic pressure was
effective in causing damage to Jeeps on Shot 10.
obtained in Operation CASTLE was valuable, it was not exough to
£2
- .
Although the data