×
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

Transient analysis of floating layer (with gravity)......

Transient analysis of floating layer (with gravity)......

Transient analysis of floating layer (with gravity)......

(OP)
Hello sexy eng-tipsters,

I am trying to create a finite element model of a concrete slab with a floating screed layer ontop to try and see the impact on the floating screed layer transient analysis. There is a hard plastic membrane between the two layers so it is as if the screed layer is resting on top of the concrete slab.

To start with, I have modelled the problem in 2D, using PLANE42 elements and CONTAC178 to join the 2 layers together. I ran the problem without gravity, but this gave undesirable effects as gravity is a major factor binding the screed layer to the concrete slab. I therfore need to apply gravity before undertaking the transient analysis. Every time i try this, I end up with far higher displacements from movement under gravity than from the transient impulse i apply.

I know this is probably simple but can someone please simply explain to me how I can apply displacement/stress due to gravity so it is in equilibrium and then do the transient analysis.

Many tanks,

BAPS

:)
 

RE: Transient analysis of floating layer (with gravity)......

(OP)
I think i managed to solve it by writing a static analysis to LS1 and then applying an impulse and writing a transient analysis to LS2. However when i run it now I get an error message after the static part of the analysis saying "The analysis type must not be changed after the first load step. For a new analysis, FINISH now and reenter /SOLUTION" as well as a couple of other messages befor it continues with the transient part of the analysis.

Is this anything to worry about? The results of the analysis look plausible but just want to check that this sounds OK.

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