Subject: Bending die question

From: [email-masked] (Felice Luftschein & Nicholas Carter)
Date: Thu, 19 Sep 1996 16:54:24 GMT

I have to design a bending die for a friend. The die
must put a 1/2" radius u bend in the bar while the
rest of the bar remains flat. He must be able to do
this anywhere along the length of a 2" wide, 3/16"
thick HRS. This is for a stair railing. the extra radius'
on both sides of the U bend are 1/4" about. How do
you figure the psi required for such a U bend, all my die books
only give figures for shear.The material will not be constrained at either end 
of the die, so that elastic deformation is kept to a minimum.
help!! thanks!