×
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

storage tank - external pressure

storage tank - external pressure

storage tank - external pressure

(OP)
Hi guys, I cretaed a model of the storage steel tank (diameter 10m, heigh 15m, wall thickness 7mm) and I load a model external pressure (underpressure) but Iam not satisfied with results, stress is equal like with overpressure and its wrong. I used shell 93 and pressure on areas... Have you ever done something similar? Help me....   

RE: storage tank - external pressure

Hi,
why would it be wrong if the stress pattern is the same as with internal pressure? Membrane stress is still the same, only the bending component is "reversed". You won't see any difference when applying internal vs. external pressure if you get the results in the "midsurface" of the shell, because here the bending stress is zero by definition and what you get is ONLY the membrane (+ longitudinal, if any) stress.
If you want to check your tank against buckling, this is a totally different matter (analysis type: buckling, if you want to perform a linear eigen-buckling analysis, or transient, if you want to perform a non-linear analysis of critical load).
Regards
 

RE: storage tank - external pressure

(OP)
Hi, I mean that stress distribution and deformation of the shell is not the same in internal vs. external pressure. It is  the same example like plastic bottle of water, you can try press the bottle by hand, it has more less stress capacity than with internal pressure..... and deformation of the shell is diferent too

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