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


Rolled Shell Elongation

Rolled Shell Elongation

Rolled Shell Elongation

Anyone knows how to calculate the stretch of rolled shell (cold working)? Is there any equation that take into its consideration the thickness and chemical composition of plate? I have problem with circumference of shell after rolling it always bigger than required and we had to cut the extra length and roll it again to get the required circumference. My equation I use on flat plate is The (actual thickness + ID)x pi +/- 1/8"


RE: Rolled Shell Elongation

That is the correct cut length calc (one I use daily)....Circumference at mid-thickness. Do you crimp the ends prior to rolling?

RE: Rolled Shell Elongation

Yes I always check that but after closing and fit up the shell the circ.is bigger than required. It usually 1/4" to 1/2" bigger on Circ and I do not know how much the tolerance allowed if the circ. is bigger than required.

RE: Rolled Shell Elongation

How thick is your material?
Is there a root opening of the weld?

RE: Rolled Shell Elongation

The thickness of material is 1 3/4" and three is no root opening.

RE: Rolled Shell Elongation

Quote (LUAY_89)

It usually 1/4" to 1/2" bigger

If you are confident of that, decrease the plate length. How close you trying to get anyway?



The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: Rolled Shell Elongation

The neutral axis of plate may not be coincident with centroid of section
See ROARKS "TABLE 9.1 Formulas for curved beams subjected to bending in the plane of the curve".
Use the formula for dimension "e" = distance from centroidal axis to neutral axis measured toward center of curvature.


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! Already a Member? Login


White Paper - Considerations for choosing a 3D printing technology
The adoption of 3D printing into major companies’ product development life cycles is a testament to the technology’s incredible benefits to consumers, designers, engineers and manufacturers. While traditional production methods have limitations in manufacturability, 3D printing provides unparalleled design freedom due to the additive method of building parts layer by layer. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close