×
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

Reduced impact test temperature

Reduced impact test temperature

Reduced impact test temperature

(OP)
We have tested a piece of SA350 LF2 with specimen thickness of 3 mm at -40°. Now Both ASME VIII-1 and B31.3 say that our minimum design temperature should be 22.2°C higher.(-40°-22.2°= -17.8°C). In other words for a min. design temperature of -40° we should have been testing at -62.2° (-40°C minus 22.2°C).What is the reason for this reduction. It seem to me that a test specimen of 3 mm absorbs less energie than a test specimen of 10 mm at the same temperature. So when a the smaller specimen has acceptable value's a thicker also will be acceptable.

Please advise  

RE: Reduced impact test temperature

It doesn't quite work like that.  The thinner the test piece as compared to the actual material, the more benign (less conservative)the test because triaxiality is reduced.  Therefore, some compensation in the test parameters has to be made.  Some codes reduce the test temperature; some codes increase the relative energy requirements.

Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
 

RE: Reduced impact test temperature

You must reread the Code requirements. The temperature  reduction is required when the test coupon is less than 80% of the thickness of material welded.

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