Chapter 4
DISCUSSION
4.2 GENERAL
The wave forms of the pressures measured ami the general agreement
between the measured and calculated dynamic pressures indicated that
the shock wave of Shot 6 was nearly a classical shock wave. Although
theréwas sand in the blast wave, as evidenced by the venicles being
sandblasted, there was an insufficient amounc of sand to alter appreci-
ably the wave forms. It is believed that the contributions to damage
of vehicles by dust wes negligible.
A surprisingly larger value of dynamic pressure is required to
cause ine sane degiee of damage to vehicies placed face-on than for
vehicles placed side-on. The value of dynamic preseure for lower
limit of severe damage, (vehicle demolished) for face-on orientation
was 12.1 psi.
Unfortunately, data were not availebie at pressure
levels less than 6.9 psi to establish the lower limit of severe damage
for side-on orientation.
A gap of GOO feet existed between the last
station for severe damageand the next station fur moderate damage .
Land area was not available for placement of vehicles within this gap.
1,2
COMPARISON OF DAMAGE: AND DISPLACEMENTS OF SHOT 6, CASTLE WITH
SHOT 10, UPSHOT-KNOTHOLE|.
A comparison of damage fpr Shots 6 (CASTLE) and 1.0 (UPSHOT-KNOT-
HOLE) is given in Table 4.1 and’shown in Figs. 4.2 and 4.2,
In both
figures, Figs. 4.1 and 4.2, the symbols S, S-M, M, and L eignify
- pevure, severe-moderate, moderate and light lJamage, respectively
sustained by the jeeps at the distpnces indicated.
The damage noted
is for side-on orientation.
Severe-moderate classification indicates
tha: item was still intact, vut repairs fi r immediate cambat use were
such as to require depot maintenance. This classification makes a
distinction from severe damage whereby item is completely dismembered.
Examination of tne limited data indicates: that, for simtlar caamage
to jeeps higher values of overpressure were recorded on Shot 6 (CASTLE)
than on Shot 10 (UPSHOT-KNOTHOLE). The relative comparisons as shown
in Fig. 4.1 indicates that damage to jeeps on Shot 10 (UPSEOT-KNOTHOLE)
corresponds to the ideal overpressure-distance curve.
However, siace
measurements of overprees3ure were taken on both shote and are reliable
the damage to jeeps on Shot 10 as w function of theideal overpressure
ia mesiingless.
As mentioned in Section 1.2, damage to jeeps will be,.@ finction
of dynamic pressure, but the magnitudes of dynamic pressure for
specific damage were in question.
On Shot 6, CASTLE, measureuents of
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