×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

ASME 5.3.2 | Local failure criteria | negative value of sum of principal stresses

ASME 5.3.2 | Local failure criteria | negative value of sum of principal stresses

ASME 5.3.2 | Local failure criteria | negative value of sum of principal stresses

(OP)
HI,

If the sum of principal stresses is coming to be negative (considering principal stresses with their respective signs "+ or -") and if this negative value magnitude i.e., absolute value is greater than the limit of 4S, will the local failure criteria be satisfied or not? The code does not say anything about the absolute values but mentions about the algebraic sum of linearized primary principal stresses which can be negative or positive.


Shiraz
Sr. Engineer

RE: ASME 5.3.2 | Local failure criteria | negative value of sum of principal stresses

Refer to ASME PTB-3, Example E5.3.2 - That should answer your questions. Here and in the previous: thread https://www.eng-tips.com/viewthread.cfm?qid=506228

Basically:
- You can use the "Sum Principals" plot of your FEA software and make sure it is less than 4S.
- Local failure will not occur with negative stress.

RE: ASME 5.3.2 | Local failure criteria | negative value of sum of principal stresses

IdanPV is correct. The intent is algebraic values of the sum of principal stresses. And the value must be less than 4S - negative values, regardless of magnitude, are less than 4S and therefore satisfy the criteria.

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



News


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