×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Estimating stress hardening of mild steels

Estimating stress hardening of mild steels

Estimating stress hardening of mild steels

(OP)
Hello,

   I'm working on a piece of furniture, and according to an FEA study one of the parts (the lower frame) needs a yield strength of roughly 65,000 PSI to pass certain certification tests.

   There are two versions of the chair, one made from mild steel and the other from stainless steel.

   The lower frame is cut from 3/8" plate, and then formed. The main span of the frame is roller formed to impart a curvature with a radius of 100".

   I want to estimate the degree that this curvature increases the yield strength of the material. My guesstimate is that starting with a 50,000 PSI minimum material like A572 grade 50, the forming would take the frame up to the needed strength. But I also wonder how far this forming will take 30,000 PSI material such as Stainless 304.

   My expectation has been that if forming from stainless, that I'd have to use 410 so that I can heat treat for increased yield strength. It would be useful to know if this forming would be sufficient (I'm thinking it isn't) so that heat treating is not needed for the stainless version.

   Attached in a drawing of the lower frame for reference - I'd appreciate any comments.

Best

Andy

Andy Somers
Myndex Technologies Inc.

RE: Estimating stress hardening of mild steels

You need to determine the strain imparted to the piece.  Then, compare that strain to a stress-strain curve for your material.  Then, you will have the increased strength.

Regards,

Cory

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources