×
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

Maximum combined bar/beam stress in NASTRAN

Maximum combined bar/beam stress in NASTRAN

Maximum combined bar/beam stress in NASTRAN

(OP)
Does anyone know how NASTRAN calculates this?  I cannot find anything in the Users guide.

I made a really simple cantilever beam with FEMAP/NX Nastran and verified that the maximum beam stress merely reports the following stress: sigma_combined = P/A + Mc/I.  

However, is there an additional component that I am missing?  I am concerned that there may be some tension, shear interaction that is causing the principal directions to be off axis quite a bit, therefore causing the equation above to be invalid (or incomplete).  I do not feel comfortable comparing the max combined beam/bar stress to a yield or ultimate material allowable to compute margins using Von Mises or Max Principal failure theory respectively.  

Any thoughts?

Thanks in advance.   

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