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Symmetry principle for mass in impact problems?

Symmetry principle for mass in impact problems?

Symmetry principle for mass in impact problems?

(OP)
I'm simulating a drop impact test (flat impactor) on a cubic block, so modelling only 1/4th of the said block according to principle of symmetry.

But what about the mass of the drop impactor? Should that remain as original mass or quarter mass be taken?? If quarter mass is taken, then the impact energy will get reduced.

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