Common questions we receive from customers have to do with the stresses put on materials during the rolling, curving, forming, and bending processes.
- What stresses are put on the materials during the curving process?
- What is the stress, strain on the steel being bent or curved?
- Is the material weakened from the stress, strain during the curving process?
- Is there a stress, strain diagram for curved or bent steel?
- Is there a stress vs strain graph for curved or bent steel?
The easiest way to answer these questions is to reference the AISC Curved Member Design Guide #33.
See Section 5.2 “Material Properties”
Cold bending involves inelastic straining of the member, which affects the material properties. These changes are primarily attributed to strain hardening and strain aging, which increases the yield stress, ultimate stress and hardness, and decreases the ductility and toughness. For curved members in buildings, the strains induced during the cold-bending process rarely exceed the potential strains induced in the manufacturing process of straight members.