×
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

Effect of specimen width on elongation

Effect of specimen width on elongation

Effect of specimen width on elongation

(OP)
As per SA 213, minimum elongation specified for T12 is 30% on 50mm gauge length. However, we observe substantial difference in tested values of elongation between full section tubes specimen and 12.7 mm wide strip specimens. This is even after considering reduction factor for thicknesses less than 8 mm. Elongation values come regularly less than 30% for strips even when full section tests are well above. Is there any conversion factor? Is there any guideline or specification which can be used to resolve the issue?

RE: Effect of specimen width on elongation

What are your elongation values under Note B below of Table 4 for SA 213? You will be having reduced elongation, less than 30% for strip tension test thickness as indicated by Note B.

Note B For longitudinal strip tests, a deduction from the basic minimum elongation values of 1.00% for TP444, T23, T24, T91, T92, T122, and T911, and of 1.50% for all other low alloy grades for each 1⁄32 in. [0.8 mm] decrease in wall thickness below 5⁄16 in. [8 mm] shall be made.

We always have used subsize rounds machined from tubes under Note A with no issues reported for low elongation values.

RE: Effect of specimen width on elongation

Full body tube samples will always give you a higher greater elongation than strip or bar samples. Part of the elongation in a tube is the collapse of the column, that can't happen in a solid sample.
With high elongation SS (over 40%) we typically see a difference of 5% between tube and strip samples.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

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