Instead of using a sandbag, which is difficult to model, have you considered using an International Standard such as IEC 62262?
The IEC 62262 standard describes how impact protection tests on enclosures are conducted. It is used to determine the protection provided against external stresses (damage to or effect of impact/energy on the enclosure) for safeguarding equipment.
It would be much simpler to model the steel hammer from this standard.
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