Game Development Reference
In-Depth Information
Figure 12-5 shows the time variation of inner wall temperature for the case of an aluminum
gas tank where the outer wall temperature is 1000
K
and the tank thickness is 0.025
m
. The
inner wall temperature remains at 300
K
for 0.3 seconds. As heat conducts through the tank
wall, the inner wall temperature begins to rise quite steeply. For this case, the ignition temper-
ature of gasoline of 550
K
is reached after 3.7 seconds.
Figure 12-5.
Time-varying temperature profiles at the inner wall of an aluminum gas tank.
Tank thickness = 0.025 m. Outer wall temperature = 1000 K.
Summary
In this chapter, we took a departure from modeling external forces and explored some internal
physics of solid objects. In particular, we studied what happens to an object when it is struck
by a projectile and how heat energy is conducted through objects. At the end of this chapter,
you should have the basic information you need to model armor penetrations and heat energy
conduction in your game programs.
Specific topics that were covered in this chapter include the following:
•
The complex processes involved in ballistic impact including inelastic deformation,
fracturing, and other forms of energy transfer
•
How the Thompson “F Formula” relation can be used to estimate whether a projectile
penetrates steel armor
•
The NIJ body armor classifications and the kinetic energy and bullet types that can
penetrate a given type of body armor
•
What happens when a bullet enters a human body and the differences between the
effects of high-velocity and low-velocity bullet wounds
