4 Finite Element Method Study of the Protection …
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Fig. 4.3 Time dependence
graph of the contact force on
the plate
Fig. 4.4 Time dependence
graph the displacement
velocity of the plate
Fig. 4.5 Time dependence
graph displacement of the
plate
results of the problem solution for the first variant (plate falls on one shell) and the
second variant (plate falls on four shells).
In the deformation process, shell closure is not occurred. Shell deformation
does not exceed 26%. The maximum contact force F max reaches 1200 kN, and the
impact time is 12.5 ms. The average deceleration acceleration of the falling plate,
calculated in Fig. 4.4, is equal to approximately 140 g (g = 9.8 m/s
2 is acceleration of gravity). In the second case, the damper of four shells does not experience
63
Fig. 4.3 Time dependence
graph of the contact force on
the plate
Fig. 4.4 Time dependence
graph the displacement
velocity of the plate
Fig. 4.5 Time dependence
graph displacement of the
plate
results of the problem solution for the first variant (plate falls on one shell) and the
second variant (plate falls on four shells).
In the deformation process, shell closure is not occurred. Shell deformation
does not exceed 26%. The maximum contact force F max reaches 1200 kN, and the
impact time is 12.5 ms. The average deceleration acceleration of the falling plate,
calculated in Fig. 4.4, is equal to approximately 140 g (g = 9.8 m/s
2 is acceleration of gravity). In the second case, the damper of four shells does not experience