I am currently working on analyzing an impact attenuator in Abaqus software. I am planning to do explicit dynamic analysis. I have few questions:

1. Designing Aluminium honeycomb in abaqus using hexagon shape ??

2. Should i specify it as solid or shell when modelling the part ?

3. Using what units should I enter the value for the mechanical properties ?

4. For High density PU foam, should I mention it as solid or shell section ??

Please help me

Thank you