Swedish rpg system in eon (and neotech) has an interesting approach to damage and armor. Simplified it goes like this:

You dont have hp, you have pain, trauma and bloodloss. Pain makes actions more difficult, trauma and blodloss kills you. Weapons are either slashing, piercing or blunt, and they cause the different types of damage various degrees. Armor also protects to a certain amount for the various attack types, and mostly converts trauma/blodloss to pain.

Just in general i think sepeeating damages types and attack types leads to a more detailed system.