RD-V: 0100 Impact Momentum

The plate is 254 mm square and 25.4 mm thick. The cube length is 25.4mm. The parts are modeled using solid elements and linear elastic material. An initial velocity of 5080 mm/s is applied to the block in the z direction. There are no other constraints in the model.

Simulation Iterations

Three different contact interfaces, /INTER/TYPE7, INTER/TYPE24, and /INTER/TYPE25 are tested to model the impact between the plate and the block. A surface to surface contact is defined for all interfaces. TYPE7 requires two different contact interface definitions in the model whereas TYPE24 and TYPE25 can define surface to surface contact using one definition.

The following system is used: mm, s, Mg.

The global momentum can be plotted from the time history output. Figure 2 shows that the global z momentum for all interface models exactly matches the theoretical momentum of 0.6452 $\frac{Mg\times mm}{s}$.

Figure 2. Global model Z momentum

Figure 3. Impactor Z momentum

Figure 4. Plate Z momentum

Conclusion

The global z momentum in the model exactly matches the theoretical momentum of 0.6452 Mg*mm/s.