Residual stress caused by yielding - bending
Residual stress caused by yielding - bending
(OP)
A rectangular bar 1/8" thick x 2.5" wide x 30" long made of Hardox 450 steel (Fy = 170 ksi) is bent 180 degrees at the center of the bar (out of plane bending) with an outside radius of 1.25". What is the residual stress at the bent section ? Is this a simple calculation or requires FEA ?






RE: Residual stress caused by yielding - bending
RE: Residual stress caused by yielding - bending
Thanks for your help.
RE: Residual stress caused by yielding - bending
Off hand, I would think that you could apply heat from some kind of torch, but you must be careful to not overheat (probably not more than about 1100-1200F). I would feel better if you were to call a local steel mill where the expertise is greater. They may bend it for you. Alot depends on the type of steel, carbon content, etc.
If you have the resourses, you could experiment a little.
Good Luck.
RE: Residual stress caused by yielding - bending
We are trying to design a spring clip for replacement of leaf springs of a bridge modular expansion joint. Good ductility and high yield is required.
Regards
http://www.oxelosund.ssab.se/
http://www.hardox.com/
RE: Residual stress caused by yielding - bending
The PWHT has to accommodate taking the residual to below yield and putting the new desired properties in. Tempering has to take into account the desired ductility and elastic recovery (springy-ness), without making the part brittle and fatigue prone.