ENGINEERING ANALYSIS INC.
HEXDAM MAN DEMONSTRATION
1.0 SAMPLE PROBLEM DESCRIPTION
The demonstration software represents a sample problem with the HEXDAM
5.2 software involving 15 pounds of TNT detonating five feet above
ground level, two feet in front of a five-foot wall which is six feet in
front of the HEXDAM Man, as depicted in the
3-D Before-Blast Display, shown in Figure 1-1.
The HEXDAM Man is a composite structure, consisting
of twenty-eight internal components. The damage/injury probability for
each such component is to be determined.
Recently, we entered into a working agreement with T3,
a Trinity Consultants Company, leading to the development of more advanced
versions of our explosive safety software.
2.0 POSTPROCESSOR OUTPUT
As indicated in the Main Control Menu, shown in Figure
2-1, output from the postprocessor is in the form of tabular data and
two-dimensional and three-dimensional graphical displays of overpressure,
dynamic pressure, and damage/injury. Such outputs include the following:
2.1 Damage/Injury Probability Table
If Option #1 is selected from the postprocessor Main Control Menu, a tabulation
of damage/injury probabilities is provided. An example of a portion of
this output is given in Figure 2-2. As indicated
in the figure, both the resultant overpressure and dynamic pressure are
also tabulated for each component. In addition, the occurrence of a secondary
explosion, if present, is indicated.
2.2 After-Blast Displays
If Option #2 is selected from the postprocessor Main Control Menu the user
can choose either a two-dimensional or three-dimensional display.
An example of the 2-D vertical-longitudinal After-Blast Display option
is shown in Figure 2-3 (animated GIF, 83K)for
the vertical-longitudinal plane at X = -8 feet. The internal components
are displayed sequentially and are color-coded consistent with the damage/injury
level, with red, orange, yellow, and green denoting severe, moderate, slight,
and minimal damage/injury levels, respectively.
An example of 3-D After-Blast Display is presented in Figure
2-4 (animated GIF, 338K). As with the 2-D display, each internal component
is displayed sequentially and is color-coded as before, but damage to the
wall is also depicted by color-coding. The display provided by Figure
2-4 (animated GIF, 170K) closely resembles the Before-Blast Display,
shown in Figure 1-1, except for the display of
damage/injury probabilities and the color-coding of components.
2.3 Damage/Injury Probability Versus Distance
Graph
If Option #3 is selected from the postprocessor Main Control Menu, the
graph of damage/injury probability versus distance from ground zero is
then displayed. This display graphically depicts in color the damage/injury
probability incurred by the components (and/or subcomponents) as a function
of their distances from the primary explosion point. Figure
2-5 is an example of this kind of graph. Notice should be taken that
if components are located equal distances from the primary explosion, and
if they experience the same damage/injury probability level, only the component
with the largest sequence number (SN) will be displayed.
2.4 Overpressure Contour Plots
If Option #4 is selected, from the postprocessor Main Control Menu, the
user can choose either a two-dimensional or three-dimensional display.
An example of a two-dimensional vertical-longitudinal overpressure contour
plot is presented in Figure 2-6. An example of
a 3-D overpressure contour plot is presented in Figure
2-7.
2.5 Dynamic Pressure Contour Plots
If Option #5 is selected, from the postprocessor Main Control Menu, the
user can choose either a two-dimensional or three-dimensional display.
An example of a two-dimensional vertical-longitudinal dynamic pressure
contour plot is presented in Figure 2-8. An example
of a 3-D dynamic pressure contour plot is presented in Figure
2-9.
2.6 Component Damage/Injury Contour Plots
If the user selects Option #6 from the postprocessor Main Control Menu
either two- dimensional or three-dimensional component damage/injury probability
contours may be available. An example of a 2-D Damage/Injury Probability
Contour Plot in the vertical-lateral plane is shown in Figure
2-10. In the 2-D Component Damage/Injury Probability Contour Plot,
for display purposes, the orientation of each component is rotated such
that the front of the component faces to the right.
In the case of three-dimensional displays two options are available.
Selection of the first option causes the generation of damage/injury probability
contours for the component specified, but all other components, as well
as the primary detonation point are included in the display. An example
of this display option is presented in Figure 2-11.
Selection of the second option causes only the generation of damage/injury
probability contours for the component specified. For this three-dimensional
display, an example is presented in Figure 2-12.
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