×
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

Determining acceptable charpy impact values

Determining acceptable charpy impact values

Determining acceptable charpy impact values

(OP)
So we select materials strength criteria based on calculated stress, factors of safety and yield stress values.

So what about the toughness criteria, how do we determine the minimum charpy impact value required for a given design?

RE: Determining acceptable charpy impact values

The design metal temperature is a good start when looking a toughness.

RE: Determining acceptable charpy impact values

Sorry - hit send my mistake. I find minimum values in the code I am designing to.

RE: Determining acceptable charpy impact values

Quote:

So we select materials strength criteria based on calculated stress, factors of safety and yield stress values.

So what about the toughness criteria, how do we determine the minimum charpy impact value required for a given design?
In a word: Experience.

Find a similar design and use the value that worked for that design.

From a practical standpoint, I've seen two methods.

1) If you are responsible for the design and manufacture, find the best comparable design and use that value.

2) If you are responsible for only the design and not the manufacture, find the best comparable design, double it and drop the test temperature at least 10 degrees.

rp

RE: Determining acceptable charpy impact values

(OP)
Thanks Guys. My suspicions were correct.

RE: Determining acceptable charpy impact values

The required absobed energy values are primarily based on material strength, thickness, and applied stress as a percentage of minimum yield strength. In gas pipelines you also need to consider ductile shear arrest.

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