×
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

How to calculated a fiber elongation for pipe Cold Bending

How to calculated a fiber elongation for pipe Cold Bending

How to calculated a fiber elongation for pipe Cold Bending

(OP)
Hi

Any one can help me find out how to calculated fiber elongation after bending as per ASME B31.4 para 332.4.2 (a)

Please help.

Thanks

C.P.

RE: How to calculated a fiber elongation for pipe Cold Bending

The radius outside of the bend is larger than the mid radius. Therefore the outer fiber is longer. Calculate the outside perimeter of the tube and deduct the mid perimeter.

RE: How to calculated a fiber elongation for pipe Cold Bending

I have a copy of ASME B31.4 and B31.3, there is no 332.4.2 in B31.4, there is in B31.3.

So, the fiber elongation limitation can be calculated as follows;

measure a pre-determined distance on the extrados of the bend (before actual bending). After the bending operation, measure this distance and subtract the two and divide by 100 = % fiber elongation. You use the OD surface of the extrados because this is where the maximum fiber elongation will ocurr.

You had better re-read 332.4.2 in ASME B31.3 because for certain materials, the fiber elongation is limited to 50% of the minimum reported elognation for the material. This means that if the material has a 25% tensile elongation on the material test report, you will be limited to 50% of this value (12.5%) for cold working, otherwise you will need to heat treat the material to remove the effects of deformation from cold bending.

RE: How to calculated a fiber elongation for pipe Cold Bending

(OP)
Million thanks sir.

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