Collision with physics asset

I have physics asset in my char and sphere collision component in some actor. How can I detect the hit between them? For example collision bullets with knee or sword with head.

I’m not sure about 4.8 but was using 4.10 and there is a option in physics asset … for physics bodies u can enable generate hit events and u will get hit events in blueprints. But cautions is to be taken as if we have multiple small bodies to a character, u might want to enable generate hit event to only few physics bodies otherwise hit event will get fired more often for every single body closely situated