×
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

Stresses at Integration Points using S4 elements

Stresses at Integration Points using S4 elements

Stresses at Integration Points using S4 elements

(OP)
All,

I have modelled using shell elements s4 a simply supported beam that has acting on it a uniform pressure load of 5N/mm2.

The dimensions of the beam are 10 mm with, 10 mm thick, and 100 mm long.

I am confused about the outcome of the stresses at the integration point of the elements. I attached a plot where I compared the integration point stresses, nodal stresses and hand-calculated stresses.

Does anyone understand the shape of the plot?

Thanks.  

RE: Stresses at Integration Points using S4 elements

Confused how?

Given that your mesh is probably far too coarse for this problem, it looks perfectly reasonable. The integration point stresses are extrapolated to the nodes and then, depending on your settings, smoothed across elements (giving "element nodal values").

If this is a slender beam-type problem (given your dimensions it would certainly qualify as such), then use beam elements instead.

More importantly, refine your mesh and watch the stresses converge.

 


------------
See FAQ569-1083: Asking questions the smart way on Eng-Tips fora for details on how to make best use of Eng-Tips.com

RE: Stresses at Integration Points using S4 elements

One more thing - end effects. Your hand calc presumably assumes zero stress at the ends but presumably there is some constraint condition in the model, giving the difference between the two.


------------
See FAQ569-1083: Asking questions the smart way on Eng-Tips fora for details on how to make best use of Eng-Tips.com

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