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2
Numerical Simulation Model
The following is an example. The armor-piercing warhead lateral section diameter
2.7cm, the length as 51.2cm, peripheral fixed target thickness is 22cm; the warhead and
the target surface normal direction had 90.0° angle; the warhead speed was the 1494m/s.
Fig.1 had given the warhead finite element discretization model structure and the grid
schematic drawing (considered computation time and cycle, carries on model
simplification, for example, for armor-piercing warhead was used to penetrate the target,
so the warhead was retained, and the sabot, base fuze etc. wear neglected) .
Fig. 1.
ModelGrid Schematic Drawing
2.1
Material Model
Material model mainly included constitutive model, state equation and strength model
[2]
.
Lagrange calculative way was adopted for only discussing the character of calculative
result lying on gridding. Material models of the armor-piercing warhead and target wear
from AUTODYN material models database. The mainly material models of the
armor-piercing warhead and target wear in Table 1.
Table 1.
The Mainly Material Models of The Armor Piercing Warhead and Target
part name
material
state equation
strength model
warhead
tungsten alloy
Grüneisen
Johnson-Cook
target
steel
Shock
Johnson-Cook
2.2
Gridding Partition
The Lagrange way was used to the armor-piercing warhead and target numerical model.
For the armor-piercing warhead perpendicularity penetration the target and the model
having the character of axis symmetry, so 1/2 model was built. For studyingthe effect of
the target grid size to penetration, the gridding shape was square, and the grid size was
deal with by dimension. K was defined for gridding side length, unit was millimeter. The
K value was respectively equaled to 20mm,10mm,5mm, and 4mm. Fig.2 showed the
armor-piercing warhead and target numerical model built by different gridding side
length.Table 2 showed the relation of gridding side length and element number.
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