Mech eng with a manufacturing option. Work in the fire protection field now doing fluid calcs, fire and smoke modelling, sprinkler systems etc.
I'll admit, I read his question wrong, I thought he was trying to indent something. The scalaped punch is complex too, they give a bit of room for the material to move into so it can more cleanly shear the face. If I remember right, poisson's ratio is part of the calc for how thick you can cleanly punch. The forces in the steel near the edge of the punched hole are very complex.
What pressure is he trying to figure out? Its not the same everywhere on the punch face.
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